The Construction Material Concrete Construction Essay

The Construction Material Concrete Construction Essay The process of curing concrete, handling it in different climatic conditions and the various diseases that can arise in concrete structures are the key points of this paper. The word concrete is derived from a latin word concretuswhich means compact or condensed. Concrete is a thick composite artificial stone like material which is made by mixing cement (generally Portland cement) and various other aggregates, such as sand, pebbles, gravel, shale, etc., with water and allowing the mixture to harden by hydration. Since the ancient times it had been used in constructing structures and today also it is used more than any other man made construction material in the world. COMPOSITION Depending upon the reqirement of the structure,the proportions of the main ingredients discussed below are varied to avail different types of concrete. By doing so the finished product can be tailored to its application with varying strength, density, or chemical and thermal resistance properties. CEMENT Portland cement is a basic ingredient of concrete. It consists of a mixture of oxides of calcium, silicon and aluminium. Portland cement and similar materials are made by heating limestone (a source of calcium) with clay, and grinding this product (called clinker) with a source of sulfate (most commonly gypsum). WATER When water is added in a cementitious material, cement paste is formed through the process of hydration. The cement paste glues the aggregate together, fills voids within it, and allows it to flow more smoothly. Water should be added in the mix very carefully as less water in the cement paste will yield a stronger, more durable concrete; more water will give an free-flowing concrete with a higher slump. Impure water used to make concrete can cause problems when setting or in causing premature failure of the structure. In the process of hydration many different reactions occur at the same time. As the reactions proceed, the products of the cement hydration process gradually bond together the individual sand and gravel particles, and other components of the concrete, to form a solid compact mass. AGGREGATES The presence of aggregate greatly increases the robustness of concrete above that of cement.Following are the different items which could be used as aggregates: Sand, natural gravel and crushed stone Recycled aggregates (from construction, demolition and excavation waste) and manufactured aggregates like air-cooled blast furnace slag and bottom ash Decorative stones such as quartzite, small river stones or crushed glass are sometimes added to the surface of concrete for a decorative exposed aggregate finish. CURING OF CONCRETE The term curing concrete signifies the process of stopping freshly poured concrete from drying out too quickly. Unless the concrete mass is not cured, or if it is left out to dry out on its own, it will not develop the full bond between all of its ingredients. In order to form a water cement paste, water is added in Portland cement after which chemical reactions take place in the mixture turns the paste into a bonding agent. This reaction is known as hydration and it produces a stone-like compact substancethe hardened cement paste. Both the rate and degree of hydration, and the resulting strength of the final concrete, depend on the curing process that follows placing and consolidating the plastic concrete. As long as the mixture contains water and the temperature conditions are favorable, the process of Hydration continues ,though at a decreasing rate . The strength of concrete is dependent on crystal growth within the concrete matrix through the process of hydration If water is not adequate, the crystals cannot grow, due to which the concrete is unable to attain the desired strength. The presence of water through proper curing of the concrete facilitates the crystal growth that encloses the gravel and sand mix, causing interweaving with each other. .The time-span of the process of Curing begins from the time of consolidation and ends at the point where the concrete reaches its design strength. The period can vary from a few days to a month or longer. For most structural use, the curing period for cast-in-place concrete is usually 3 days to 2 weeks. During this period, the concrete mass should be kept moist and as near 73F as practical. Bridge decks and other slabs exposed to weather and chemical attack usually require longer curing periods. The time span of the curing period also depends on the factors such as type of cement used mix proportions required strength size and shape of the concrete mass weather conditions and temperature future exposure conditions SIGNIFICANCE OF CURING A proper and effective curing process helps in improving various properties of concrete such as freeze and thaw resistance strength watertightness wear resistance volume stability. Serviceability and apperance The compressive strength of concrete that has been properly cured is 75 to 95 per cent more than the concrete that has not been cured. Figure 1 illustrates this by comparing the compressive strength of concrete(at 180 days) for which the surface has been either kept moist for the entire duration of 180 days or is kept moist for various periods of time and allowed to dry out or is allowed to dry out from the time it was first made.It is quite clearly depicted that the compressive strength of the concrete is highest when it is fully cured for the entire period of 180 days. Fig 1:Moist curing effect on compressive strength of concrete source:www.tpub.com The permeability and absorptivity of concrete mix depends upon the porosity of the mix ie whether the pores and capillaries are discrete or interconnected. The porosity of the mix is reduced overtime through proper and effective curing of concrete thereby increasing the durability of concrete. Also, proper curing of concrete mix will reduce crazing, dusting and scaling of the slab thereby ensuring better serviceability and appearance. STAGES IN CURING PROCESS After the concrete mix have been placed, it is imperative to keep it moist and maintain specified concrete temperatures.The process of curing starts immediately after the placement of concrete and it goes through two stages : Initial curing stage: time of placement to initial set. This stage would include all the deliberate action taken between placement and final finishing of concrete. Approximate conditions during the initial curing period should be forecast prior to construction. Under this stage,the rate of strength gain of the concrete is minimal. The various aspects to be dealt with construction initial curing period as shown in diagram below are : verifying evaporation conditions: concrete temperatures, wind velocity, air temperature, and relative humidity are required to be taken into account during placement. These elements are used to make nomograph to calculate the evaporation rate and to determine whether critical drying rates exist. Using the concrete placing temperature, the time of initial setting can be estimated. The time of initial setting is the optimal time for application of final curing. Major items requiring attention during construction-initial curing period. Source : www.fhwa.dot.govt Onsite adjustments for Excessive drying: In order to reduce evaporation rates of bleed water the following two adjustments could be made- reducing concrete placing temperatures- Cooling aggregate stockpiles, cooling mixing water, or using ice for mixing water are very effective ways of reducing concrete temperatures. use of evaporation reducers. Evaporation reducers are water emulsions of film-forming compounds. The film-forming compound is the active ingredient that slows down evaporation of water. There is also a benefit from the water fraction of the evaporation reducers, in that it compensates to a small degree for losses of mixing water to evaporation.Evaporation reducers may need to be applied several times, depending on the conditions. Concrete that are liable to quick drying is required to be covered with wet gunny bag or wet hessian cloth properly squeezed, so that the water does not drip and at the same time, does not allow the concrete to dry. This condition should be maintained for 24 hours or at least till the final setting time of cement at which duration the concrete will have assumed the final volume. The Final curing stage: The final curing period is defined as the time interval between application of curing procedures and the end of deliberate curing. Final curing methods fall into four categories: Water curing : Water curing can be done in various ways like immersion,ponding, spraying or fogging and wet covering.This is by far the best method of curing as it satisfies all the requirements of curing, namely, promotion of hydration, elimination of shrinkage and absorption of the heat of hydration. Curing a house slab by flooding. Source: http://www.builderbill-diy-help.com/curing-concrete.html The precast concrete items are normally immersed in curing tanks for a certain duration. Pavement slabs, roof slab etc. are covered under water by making small ponds. Vertical retaining wall or plastered surfaces or concrete columns etc. are cured by spraying water. In some cases, wet coverings such as wet gunny bags, hessian cloth, jute matting, straw etc., are wrapped to vertical surface for keeping the concrete wet. For horizontal surfaces saw dust, earth or sand are used as wet covering to keep the concrete in wet condition for a longer time so that the concrete is not unduly dried to prevent hydration. The diagram below summarises the major criteria for using water-added curing methods. Major features of curing with added water. Membrane curing : this curing method is mostly used when there is less availability of water in the region where curing is done. Under this method, concrete could be covered with membrane which will effectively seal off the evaporation of water from concrete. A continuous seal over the concrete surface is maintained by means of a firm impervious film to prevent moisture in concrete from escaping by evaporation. Some of the materials, which can be used for this purpose, are bituminous compounds, polyethylene PLASTIC SHEETING source:www.builderbill-diy-help.com or polyester film, waterproof paper, rubber compounds etc. When waterproofing paper or polyethylene film are used as membrane, care must be taken to see that these are not punctured anywhere and also see whether adequate lapping is given at the junction and this lap is effectively sealed. Application of heat : When concrete is subjected to higher temperature it accelerates the hydration process resulting in faster development of strength. Concrete cannot be subjected to dry heat to accelerate the hydration process as the presence of moisture is also an essential requisite. Therefore, subjecting the concrete to higher temperature and maintaining the required wetness can be achieved by subjecting the concrete to steam curing. The exposure of concrete to higher temperature can be done by Steam curing at ordinary pressure, Steam curing at high pressure ,Curing by Infra-red radiation ,Electrical curing. Traditional steam curing of concrete pipes (www.construction-int.com) Miscellaneous : Calcium chloride is used either as a surface coating or as an admixture. It has been used satisfactorily as a curing medium. Both these methods are based on the fact that calcium chloride being a salt shows affinity for moisture. The salt not only absorbs moisture from atmosphere but also retains it at the surface. This moisture held at the surface prevents the mixing water from evaporation and thereby keeps the concrete wet for a long time to promote hydration. Formwork prevents escaping of moisture from the concrete, particularly, in the case of beams and columns. Keeping the form work intact and sealing the joint with wax or any other sealing compound prevents the evaporation of moisture from the concrete. This procedure of promoting hydration can be considered as one of the miscellaneous methods of curing. At the end of the curing process majority of cement gets hydrated.There is slow rate of compressive strength gain of around 50-100 psi/hours and little exothermic heat generation. In the entire process of curing if one of the curing procedures is used initially, it may be replaced by one of the other procedures after the concrete is 1 day old, provided that the concrete surface is not permitted to become dry at any time. After the termination of the curing process the adequacy of a curing program could be verified.Although strength is the primary variable around which curing specifications are based several other approaches can also be used like Surface Water Absorption: the amount of water a dry concrete specimen absorbs in the first minute or so after contact with liquid water is directly related to the quality of the curing of the near-surface zone of the concrete. This method has direct applicability to verifying curing. The method is reasonably applied to cores, which can be dried to a constant low moisture content before testing. Rebound Hammer: The rebound hammer method basically measures the modulus of elasticity of the nearsurface concrete. This may actually recommend the method for use in evaluating the curing of concrete pavements, where near-surface effects are considered most important. The test method is suitable for in-place measurements. Laboratory work has shown that rebound numbers of uncured concrete exposed to modestly severe drying are reduced by about 50 percent at 7 days relative to well-cured concrete. Strength of Cores: The strength of concrete is strongly affected by inadequate curing, and, in theory, could be detected by measuring strength of cores. the effects of poor curing are only strongly apparent in the properties of the top 50 mm of concrete, and sometimes even less. Ultrasonic Pulse Velocity: The ultrasonic pulse velocity (UPV) method is an indirect measure of the modulus of elasticity of concrete. The modulus of elasticity of concrete tends to increase with increasing hydration (or quality of curing) of the cement paste fraction of the concrete. UPV testing can be set up in a number of configurations, each of which tends to focus on slightly different features of the concrete. A simple pulse velocity taken through a piece of concrete, which is the traditional way of using UPV to investigate concrete properties, gives information on the average quality of the concrete. Abrasion Resistance: The degree of curing has been shown in numerous research publications to be strongly reflected in the abrasion resistance of the cement-paste fraction of concrete. This truth is easily verified qualitatively using an electrically powered wire brush and observing the ease with which the near-surface mortar can be removed from a small spot of concrete. Poorly cured concrete is easily abraded away, while well-cured concrete is quite difficult to abrade away with such equipment. DISEASES OF CONCRETE Deterioration of concrete buildings is becoming a cause of concern now a days. Often the structures located along open water, lakes, rivers and oceans are extremely vulnerable to attack from the harsh environment i.e. salt, moisture, humidity, carbon dioxide, etc. cracks, spalls and rust stains are some of the visual symptoms of the deterioration of concrete. CRACK Crack is the most common diseases of concrete structures and it occurs as a result of material discontinuity. Thermal and shrinkage cracks can be associated with high cement content and high strength concrete. Usually cracks occur in the concrete structures due to various reasons such as excess water in the mix ,rapid drying of the concrete, improper strength concrete poured on the job, lack of control joints, if Concrete is poured on frozen ground, alkali-silica reactionetc. In order to prevent cracks in concrete structures, following preventive measures could be taken: Estimate in advance the quantity of water to be mixed to get the required concrete mix. Adding too much water in the mix is one of the main causes of cracked concrete Do not pour concrete on the frozen ground .A compacted subgrade could be used to pour concrete upon to prevent cracking Cut control joints into the concrete so that the slab will be able to shrink and expand with temperature changes. Control joints should be cut the same depth of the slab and spaced a maximum of three times the thickness of the concrete. The slab must retain enough moisture so that the drying and shrinking happens as slowly as possible in the days and weeks after pouring. Curing helps the concrete to retain moisture in the concrete so that it can continue to gain strength to resist cracking. CRACKS ON CONCRETE SURFACE Source:www.homebuildinginformation.com FROST When the concrete is critically saturated i.e. approximately 91% of its pores are filled with water then deterioration of concrete from freeze thaw actions may occur. When water freezes to ice it occupies 9% more volume than that of water.In case there is no space in concrete for this expanded volume , a kind of distress is caused which will result in loss of concrete surface. A surface active agent should be added to the concrete mixture in order to prevent frost in a concrete structure. This creates a large number of closely spaced, small air bubbles in the hardened concrete which would act as expansion chambers to relieve the pressure build-up. It is to be noted that concrete with high water content and high water to cement ratio is less frost resistant than concrete with lower water content. ABRASION AND CAVITATION Hydraulic Concrete structures are affected by Abrasion-erosion due to the action of debris rolling and grinding against surface. The sources of the debris include construction trash left in a structure, riprap brought back into a basin by eddy currents because of poor hydraulic design or asymmetrical discharge, and riprap or other debris thrown into a basin by the public. Mechanical abrasion is usually characterized by long shallow grooves in the concrete surface and spalling along monolith joints. general abrasion and cavitation erosion results in coarse aggregate exposed concrete surface, concrete uneven surface, resulting in holes. In order to prevent the structure to suffer from abrasion the concrete should include the maximum amount of the hardest coarse aggregate that is available and the lowest practical w/c. In addition to this,high-range water-reducing admixtures (HRWRA) and condensed silica fume have been used to develop high compressive strength concrete 97 MPa (14,000 psi) , at this strength the concrete mix assumes a greater role in resisting abrasion-erosion damage. Also vacuum-treated concrete, polymer concrete, polymer-impregnated concrete, and polymer portland cement concrete could also be used to increase the abrasion resistance. In existing structures, balanced flows should be maintained into basins by using all gates to avoid discharge conditions where eddy action is prevalent. ABRASION source:www.nrc-cnrc.gc.ca CARBONATION Carbonation is a chemical reaction between atmospheric carbon dioxide and hydrated cement compounds which causes a reduction in the alkalinity of the concrete. The permeability and moisture content of the concrete directly affects the rate of carbonation . Pop-corn like calcite crystals present in carbonated paste. source:www.concrete-experts.com In the process of carbonation the calcium bearing phases present in the concrete mass are attacked by carbon dioxide of the air and converted to calcium carbonate.In this process the alkalinity of the concrete is lowered from an initial pH of around 13.5 to around 8.5 over some years. One method of testing a structure for carbonation is to drill a fresh hole in the surface and then treat the cut surface with phenolphthalein indicator solution. This solution will turn [pink] when in contact with alkaline concrete, making it possible to see the depth of carbonation. In order to combat the process of carbonation aquron products from Allcrete industries could be used which helps in the following ways seals out moisture to a depth of 100mm or more reduces oxygen permeability by a pore-blocking process brings up the alkalinity of the concrete purging and binding chlorides in the colloidal silicate hydrogel formed in the pores and capillaries of the concrete It is to be noted that when Concrete is treated within 24 hours of casting ,it will be protected for life against carbonation problems and aged concrete, once treated, will become immune to further deterioration. CORROSION Corrosion of steel reinforcement in concrete structures is well known to be Concrete Cancer, which happens to be a significant area of concern in the area of infrastructure and building across the world. Corrosive species can enter the concrete mix if the ingredients of the concrete mix such as water, aggregates, additives are contaminated.When such corrosive species reacts with the chemical compounds under the porous nature of concrete,the problem of corrosion occurs. Corrosion damage to the reinforcing steel results in the build-up of voluminous corrosion products, generating internal stresses and subsequent cracking and spalling of the concrete as shown schematically in the diagram below: Figure 2source:www.corrosion-club.com source:www.zoranthepainter.com Corrosion mechanism Concrete Cancer The most frightening thing is that the corrosion can be going on under the surface and will not be noticed until the concrete starts visibly disintegrating. The outcome of such corrosion is that concrete reduces its strength and also the steel re-enforcing within the concrete can rust and the pressure this creates can cause the concrete to crack and crumble. Buildings in coastal areas are especially at risk. The preventive measures to avoid such kind of concrete cancer are listed below: Epoxy coating: The concrete structures that are exposed to deicing salt may benifit from use of epoxy-coated, hot dip galvanised or stainless steel rebar. Epoxy coated rebar can easily be identified by the light green colour of its epoxy coating. Applying Sealants: After the process of curing, penetrating sealants must be applied. Sealants include paint, plastic foams, films and aluminum foil, felts or fabric mats sealed with tar, and layers of bentonite clay, sometimes used to seal roadbeds. corrosion inhibitors: calcium nitrite can also be added to the water mix before pouring concrete. Generally, 12 wt. % of calcium nitrate with respect to cement weight is needed to prevent corrosion of the rebars. Extreme weather conditions such as high ambient and concrete temperature, low relative humidity or a mere 40 F or less average daily air temperature for more than 3 consecutive days, tend to impair the quality of freshly mixed or hardened concrete thereby giving detrimental results. Therefore, it becomes imperative to handle concrete with caution both in extreme hot and cold weather. EFFECTS OF HOT WEATHER AND PROPER HANDLING On the compressive strength: When the temperature of concrete is high cement hydrates at a much faster rate, it sucks up water and grows crystals around the aggregate particles but dont have time to grow strong . Although, the early strength will be higher but 28-day strength suffers. If the concrete is about 18 hotter than normal (for example, 88 instead of 70), the ultimate compressive strength of the mix will be about 10% lower. On the colors of integrally colored concrete: under hot weather conditions , slump decreases rapidly as the cement sets up and and more mixing water is needed. In integrally colored concrete,this can lead to variations in water content which can result in significant differences in concrete color between adjacent pours. Surface drying: high concrete temperature and hot dry wind across the concrete can cause more drying and surface shrinkage. Thermal differentials: sometimes the hot weather condition makes one part of the concrete mass warmer than another part. If this differential is greater than about 20F then concrete gets cracks. Difficulty in maintaining air content can be a problem in warm concrete. Mixing is more likely to drive air out of the concrete making the level difficult to control. Dealing with hot weather concreting Plastic shrinkage is a particular problem in hot weather concreting. As a general rule, each 10o F increase in ambient temperature reduces slump about 1. A switch from ASTM C494 Type A to Type D water reducing and set retarding mix may be part of an effective plan for hot-weather concreting. Aggregates forms a major part in a concrete mix so its temperature has the greatest effect on concrete temperature. Shading of aggregate piles is ideal, although not always possible. Using cool water is another way to get cool concrete. Ready mix producers in hot climates use chilled water or ice to lower the concrete temperature. Retarding admixtures can also contribute towards controlling concrete in warm weather. When the concrete is hot, the setting time is very quick .At that time Retarder can be added at the plant or on the job site . Retarders delays the setting time but they also give the concrete more time to dry out, so curing is critical. Retarders come as straight retarders or as water-reducing and retarding admixtures. Mid-range water reducers can increase the air content of the concrete. For concrete that is to be stamped, consider using step retardationadding retarder to the mix after half of the batch or after one-third and two-thirds have been placed. For textured concrete one of the strongest things to do in hot weather is step retardation. In order to avoid slump loss superplasticizer (high-range water reducer) could be used. These admixtures can increase slump without affecting the concretes final strength or appearance. Before placing the concrete on a subgrade wet down everything, subgrade and forms, with cool water so moisture isnt absorbed from the concrete, which can lead to cracking. In order to prevent the evaporation of surface water use a monomolecular film or evaporation retarder as soon as the concrete is down and bull floated. These materials evaporate after a couple of hours. Monomolecular film will prevent plastic shrinkage cracking and surface crusting. In hot and dry weather curing needs to start as soon as finishing operations are completed. A white pigmented curing compound could be used with plain gray concretein order reflect sunshine. Also the white curing blanket could be used for the same purpose. A white pigmented curing compound on plain gray concrete white curing blankets keep the concrete cooler by reflecting can help reflect some heat from the sun the sun In a hot climate, stain the concrete in the coolest part of the day as staining concrete relies on a chemical reaction that happens faster in hot weather.If concrete is stained in 95 to 100 weather ,it can ruin the entire job. Staining is best done early in the day when the concrete is cooler For an overlay installation it is advisable that the concrete surface temperature should be between 50 and 80.Installing an overlay during the hottest part of the day amidst direct sunlight could adversely affect the quality of the result. EFFECTS OF COLD WEATHER AND PROPER HANDLING During cold weather until the concrete gains compressive strength of 500psi , it is under threat of either getting freezed up which in turn could break up the matrix or the concrete mix sets at a very slow pace. Below 40F the hydration reaction basically stops and the concrete doesnt gain any further strength. when the ground is cold, the concrete in contact with it will be cold and will set more slowly. This can lead to the problem of crusting, with the top part of the concrete set and the bottom still soft. During the process of shifting the concrete mix from the ready mix plant to the job site there will be some heat loss. While placing concrete in cold it is advisable to remove all snow and ice from that area. Also any standing water should also be removed that could get mixed into the concrete. In case of a frozen land, it is advisable to thaw it using hydronic heat pipes and blankets (such as those from Ground Heaters), or electric blankets (check out Power Blanket). It is also suggested to Warm up anything that will come in contact with the concrete, including forms and any embedments, to at least 32F. Covering everything with tarps the day before the pour, will keep it dry and warm enough.also blankets could be used for the same purpose as well. Place triple layers of insulating blankets at corners and edges that could freeze. Wrap any protruding rebars. Make sure the blankets wont blow off during the night. Ground heaters Inc Portland cement association While placing decorative concrete in cold weather it is suggested to use a dial pocket thermometer or an infrared thermometer to test the concrete temperature as it is needed to be kept above 50F for the concrete to keep gaining strength. Also on exterior concrete, customers should be reminded to keep deicing chemicals off the surface during the first winter. Deicers can lead to spalling of newer concrete. During the process of finishing concrete in cold weather, it is advisable to let all the bleed water to evaporate first otherwise water-cement ratio would increase surface of concrete would get weak. Bleed water is basically the concrete particles settling (like mud in a stirred up pond) and squeezing out all the extra water. Vacuums can also be used for this purpose. It should also be noted that sealing concrete in cold weather conditions is very risky. Power blanket Layfield Group In order to keep the slab warm hydronic heating pipes or electric heating blankets could be used. These are laid on top of the slab and insulated. Also, in case it is too cold to even place the concrete, then the only option left is to enclose the work and heat the air. In case of an enclosure,it is required to consider the potential problem of carbonation. With unvented heaters (salamanders), or even with gas-powered equipment, the carbon dioxide levels can increase. This carbon reacts with the concrete, creating a chalky carbonated layer at the surface which is unacceptable. To fix this problem use heaters that exhaust to the outside of an enclosure or building and just blow in warm air. Maintain the concrete temperature above 40 degree

Parisian Realism Artists of the 19th Century

The following body of work focuses upon Realism and the artists, Manet (not to be confused with Monet) and Degas, two Parisian artists of the 1800s who captured the lives of the French people through their paintings.   Realism’s definition, it’s three defining characteristics, and its place in the time line of art history will be briefly presented, moving into the similarities and differences, such as mediums used in the artists’ works and their subjects of focus, found between Manet and Degas, in regards to their life’s passion as artists of the 19th century.   Brief summaries of each artist’s life will precede comparison of two selected â€Å"famous works† to compare and contrast the artists manifested passions for the work each created.RealismRealism is a style of painting which depicts subject matter-form, color, space-as it appears in actuality or ordinary visual experience without distortion or stylization (progressiveart.com).   Through realism, subjects are depicted in as straightforward a manner as possible, without idealizing them and without following rules of formal artistic theory (artcyclopedia.com).   Little emotional value is depicted, as the painter shows nature and people just the way he or she observes them (horton.ednet).Realism began to appear on the art scene in the 18th century, following the styles of Romanticism and Neoclassicism; French realism, in particular, was considered the guiding influence on the philosophy of Impressionists (artcyclopedia.com).   Manet and Degas were both considered Impressionists as well as Realists, Manet eventually being considered the leader in the Impressionist movement (artchive.com).Edgar Degas (1834-1917)Born in 1834 to a wealthy Parisian family, Degas was considered a shy, insecure, aloof individual; he never married.   Due to the family’s status, there was never a shortage of funds for his passion of art (artchive.com)[1].   Receiving his training in Louis Lamothe’s studio, Degas displayed the intense influence of paintings and frescoes he observed on long trips to Italy; his notebooks are filled with these subjects (metmuseum.com)[2].   He eventually came to â€Å"maturity† as a painter in the 1860s, where history painting was considered the most popular art at the time (artchive.com).Degas varied with mediums and supports, ranging from his classical training of oil painting on canvas to working with pastels on paper.   Sometimes he would combine mediums, as evident with his combination of oil and tempera paint on canvas with Dance School, dated 1874.   His subjects were typically women, especially noted for his observation of ballet in the 1880s, and people’s faces, of which he started out with self-portrait work before moving onto Parisians of low class.*Dance School, 1874[3]This work captures several different activities going on in a dance class.   There is the instructor, with whom three students are focused on the instruction being given.   A dancer in the left foreground pays attention to the violinist before her, as if waiting for a cue, from the music being played, to either join her classmates directly behind her or perhaps to wander to another part of the room where other students can be found.   This appears to be a possibility with another dancer, who stands poised with her head tilted to the left, listening for the moment to pull her into full stance and move into formation with her fellow classmates.The young lady directly behind her appears to be distracted, perhaps bored with the routines that are consistently taught, as she places her arms up around her head and looks slightly upward towards the ceiling.   A dancer at the window may be also distracted or bored but the observer is unaware due to the nature of her back being turned towards the class.   A final dancer stands at the bar, leg extended and appears to be concentrating on her bala nce and poise, or perhaps preparing herself to join the class after a proper warm up.Light from outside streams into the classroom, softly touching the floor, reaching out to add a sort of quiet lingering in the room; for all the various activities in the room, one would assume a sort of busy, almost chaotic sense would linger, creating distraction for all dancers, and even perhaps the musician and dance instructor, while in the midst of this setting.Eduard Manet (1832-1883)Manet was born in 1832, into the Parisian bourgeoisie.   Although well educated, he didn’t excel in the academic world; he displayed a passion for the arts at an early age and was encouraged by his mother’s brother to pursue this passion.   It wasn’t until after serving a brief time in the Merchant Marines in 1850 that he took up study with Thomas Couture, of which he stayed with his mentor until 1856.   During this time, he displayed preference for the works of Valazquez and Goya but f elt that â€Å"one’s art should reflect ideas and ideals of the present, rather than the past† (artchive.com).Manet, much like Degas, focused on the lower class Parisian people, a class unlike the class either one were born into.   Manet also had a preference for nude models in his work, of which he displayed in some of his work, the most popular-and controversial work being Olympia, an oil paint on canvas work from 1863.   His mainstay for medium preference was oil paint with a canvas support.*Olympia, 1863[4]The painting that caused a stir in 1863, one of which Manet did not intend.   The artist didn’t consider himself a radical, like Courbet but this work caused controversy just the same (artchive.com).   In the painting, there is a woman appearing to be reclining, with a relaxed, non aroused appearance not only found in her expression but can also be seen in her posture.   She wears a few simple pieces of jewelry, a flower tucked behind her left ea r, and one of her slippers has fallen off of her foot, yet she doesn’t seem to pay too much attention.   A small black cat, almost hidden in the shadows, arches its back and eyes are wide.The indentation made by the lady’s elbow emphasizes the softness of the pillows she reclines upon, and the floral scarf or shawl she is holding in one hand-with the remainder appearing out from under her lower body, seems to add a touch of color to the otherwise stark, white of the bedding she is resting upon.   Emerald curtains, perhaps made of velvet or a similar heavy fabric used with window treatments, hang in the background, one pulled aside just right of the subject’s head.To her left, it appears as if a servant of the house has brought flowers into the room; from a suitor or maybe even from the painter himself-although Manet was newly married at the time of the painting.   The servant’s expression displays a hint of trying to capture the attention of the rec lining woman but to no avail.Compare/ContrastDegas and Manet were working at the same time, and although Degas worked with other mediums and supports, such as pastel on paper, the two artists focused upon the common people of Paris, mainly women.   Degas has been more noted for his work with dance classes, Manet for his focus with women, such as the subject in Olympia, and the barmaid in A Bar at Folies-Bergeres, 1881-82[5].   Natural, relaxed expressions are to be found on the faces of the women who were the subjects of these two Parisian artists, bodies not posed for endless, exhausting hours appear to be more relaxed, giving a sense of â€Å"in the moment† with the work displayed, from beginning to completion.Similarity is found in the ability to allow subjects to â€Å"just be,† as opposed to awkward posing and unrealistic facial expressions. Difference can be found in the quality of the completed work, focusing on the mediums implemented by each artist.   Ma net’s use of oil on canvas provides a polished, almost photograph-like appearance, almost as if numerous sessions were undertaken to capture the quality of the resulting work.   Degas’ use of oil and tempera on canvas, sometimes an implementation of pastels and paper, gives a more â€Å"on the spot,† beginning on sight and then moving away to completion upon return to the studio quality to his finished work.SummaryManet and Degas, Parisian artists of the 19th century, men who were noted as Impressionists as well as Realists of their time, captured the images of the people of France, Paris and low class citizens in particular, and brought them to life on canvas for the world to eventually come to view; their works are displayed across the globe, from such places as Shelburne, Vermont to London to Paris.   Manifesting real life images, in a more natural state of being, was the center of the work Manet and Degas focused on in the duration of their art careers, influencing fellow and future artists to explore capturing the moment, and bringing the moment to life on the canvas.Works Citedwww.artchive.comHughes, Robert.   Nothing if not Critical: Selected Essays on art and Artists.*DegasMacDonald, Lisa.   1999.*Manetwww.artcyclopedia.com*Characteristics of Realismwww.google.com*Characteristics of Realismhttp://www.horton.ednet.ns.ca/staff/syme/arthistory/tsldo39.htm*Definition of Realismhttp://www.progressiveart.com/art_terms.htmwww.metmuseum.orgSchenkel, Ruth.   Edgar Degas: 1834-1917 Painting and Drawing.   In Timeline ofArt History.   New York: The Metropolitan Museum of Art, 2000.http://www.metmuseum.org/toah/hd/dgsp/hd_dgsp.htm[1] Notes from Huges, Robert.   Nothing if not Critical: Selected Essays on art and Artists.   www.artchive.com [2] Notes from Schenkel, Ruth.   Edgar Degas: 1834-1917 Painting and Drawing.   In Timeline of Art History.   New York: The Metropolitan Museum of Art, 2000.   http://www.metmuseum. org/toah/hd/dgsp/hd_dgsp.htm [3] Image can be found at www.artchive.com [4] Image can be found at www.artchive.com [5] Image can be found at www.artchive.com

Geoffrey Chaucer’s the Wife of Bath Essay

â€Å"The Wife of Bath’s Prologue and Tale explore many aspects of patriarchy – and sometimes reveal surprising attitudes within the tale and prologue.† Discuss. Geoffrey Chaucer’s the Wife of Bath is a text which is interwoven with references to Patriarchy and unanticipated attitudes towards the social backdrop in which it was created. Written in a period where males dominated the hierarchy, Chaucer through the Wife portrays the reversal of traditional roles, and a sense of rebellion and feministic instincts which at the time appeared extraordinary: â€Å"His poetic sensibility, combined with an immense understanding about men and women, enabled him to survey the life about him with such imaginative insight and power.† (Bennet 74) Throughout the Canterbury Tales, Chaucer speaks with remarkable authority on a huge range of subjects. This is perhaps made possible by the assortment of characters from all areas of society which travel on the pilgrimage. Alisoun’s character is perhaps best encapsulated in the manner of her entrance to the Tales. Clothed in the finest garments, her â€Å"hosen weven of fyn scarlet need†, well-travelled and â€Å"carteyn so wroth†, the Wife: â€Å"Strides into the Canterbury Tales on a large horse, spurs jangling, and ready to assert herself in a company made up almost entirely of men†¦ She is a medieval housewife who is not just going to star in a story, she is going to tell it.† (Reading the Wife’s Prologue and Tale) A far cry from the meek and submissive maidens so often portrayed in classic literature and fables prior to this; the Wife is independent, liberated and outspoken. The Wifes’ relationship to the men in her life is often one of total domination and manipulation. She enjoys â€Å"maistyre† over her male counterparts: Unne the mught they the statut holde In which that they were bounden un to me Ye woot wel what I mean of this, pardee! As help me God, I laughe whan I thynke How piteously a- nyght I made hem swynke. The Wife governs many aspects of her husbands’ lives, and rules with special sovereignty in the bedroom. Her sexual powers are and obvious source of seduction and control over her lovers. Very much a humanistic text, the Canterbury Tales constantly remind the reader of the complexity of the human character. One example of this could be the Knight, the embodiment of â€Å"chivalrye, Trouthe and honour, freedom and curteisye† in the hierarchy of society at the time. At first he appears to fit the specification perfectly. The however subtle passing motion which slightly removes the Knight from this brave and righteous tradition is left with us when he is described as â€Å"meke as a mayde†. Chaucer understood the depth of personality in each individual, and that a stereotype is never applicable. His characters almost always only very nearly fit the stereotype, and leave us scope to remain unconvinced about the rest. This refusal to comply with what many would describe as the one dimensional and traditional Fairytale characters allows for the issues of patriarchy to be discusses liberally. Interestingly, even at points of text which reflect a relaxed and conversational tone, the Wife constantly feels the requirement to reemphasise and argue her point with references to astrology and biblical references. These biblical references however are often contorted to suit the Wife’s requirement in the argument. For example the term from Genesis 1:22,28 â€Å"Go forth and multiply† is used as an excuse for the remarriage of the wife. This control and knowledge of the Church’s text represent a disregard to Patriarchal structures at many levels. The male governed Church, with its male oriented texts and belief systems for the Wife especially represent the oppression of men. For Alisoun the structures of literature, religion and authority are connected in that they represent male dominance. The Wife of Bath however cannot be totally classified as a pro feminist character. At many levels her dishonest, manipulative nature reinforces the common negative conceptions of anti- feminism at the time. Hansen (cited in Beidler) claims that this anti-feminist discourse mentioned above is less of a product of archness towards patriarchal literature. â€Å"Instead she is trapped in a ‘prison house’ of anti-feminist discourse. She is unable to see that her tactics simply reinforce all the stereotypical Medival ideas about women as cruel, emotional, and sexually voracious. Chaucer therefore is seen as reinforcing antifeminist views rather than undermining them.† Alisoun provides a vessal through which thousands of years of antifeminist literature are regurgitated with a revised purpose and tone of archness. One example of this method comes in Alisoun’s first words to the group, a repeat of earlier rhetoric (Awkroyd): Expeience, though no autoritee, Were in this world, is right ynogh for me To speak of woe that is in marriage. Peter Awkroyd (2005) believes that Chaucer â€Å"uses much of the antifeminist literature of the period but, by placing it in the Wife’s capacious mouth, he lends it a new and ironic lease of life.† The Wife’s five marriages on the outset portray a sense of calculated systematic marrying for the advancement of wealth and power. However, it could be argued that Alison was more than simply a ruthless professional. There are arguments that the fourth, and especially the fifth husband Jenkin, captured her love and stood in more than equal stead with their spouse: â€Å"That al myn herte I yaf unto his hold/ He was, I trowe, a twenty winter oold, and I was fourty.† Although the true love described by Chaucer at first appears conformal to the description of traditional literature, as often the case in the Tales, there is a cause for disease. In this case the context in which the romance begins, the burial ceremony of husband number four, Alisoun covets the younger page boy and her future husband. In Jankin, Alisoun finds a man to which she is willing to submit. Cruel, abusive, manipulative this husband domineers the relationship, physically, emotionally and sexually. At this stage the once immovable opposition to patriarchy admits that he partner â€Å"so well koude he me glose†. Furthermore the Wife admits that it is this form of denial and subornation in a relationship which causes women to crave what they cannot have: â€Å"wait what†¦crave† The dictatorship of Jenkin is further developed by Minnis, who claims Jenkin: â€Å"read aloud to her (translating from his anthology of antifeminist texts – It could be said then that she has learned at home, from her husband – how acquiescent and submissive can one get?† (Minnis 249) The Wife of Bath’s Tale and Prologue, as a text which attempts to examine Patriarchy, the attitudes portrayed are purposely less definable. Often categorised as either a feminist or anti- feminist text, The Wife of Bath is a complex mixture between the two. Chaucer, as always does not provide specific or obvious attitudes to these hierarchies and relationships. Instead, like his characters he provides us with an insightful cross- section of the Patriarchal society in which he existed. Reference List Awkroyd, Peter. ‘The Tales of Canterbury.’ Chaucer. London: Vintage, 2005. 150 – 53. Beidler, Peter G. Geoffrey Chaucer: The Wife of Bath. New York: Bedford Books, 1996. Bennet, H.S. ‘Chaucer.’ Oxford History of English Literature: Chaucer and the Fifteenth Century. Ed. F.P Wilson and Bonamy Dobrà ©e. London: Oxford, 1947. 74 – 75. Minnis, Alastair. ‘Chapter 4 Gender as Fallibility.’ Fallible Authors: Chaucer’s Pardonerand Wife of Bath. Philadelphia: University of Pennsylvania Press, 2008. 249. ‘Reading the Wife of Bath’s Prologue and Tale.’ York Notes Advanced: The Wife of Bath’s Prologue and Tale. London: Longman, 1998. 3 – 10.

The National Apology of 2008 - 1258 Words

Intro: 50-80 words The National Apology of 2008 is the latest addition to the key aspects of Australia’s reconciliation towards the Indigenous owners of our land. A part of this movement towards reconciliation is the recognition of Indigenous Australians and Torres Strait Islanders rights to their land. Upon arrival in Australia, Australia was deemed by the British as terra nullius, land belonging to no one. This subsequently meant that Indigenous Australians and Torres Strait Islanders were never recognised as the traditional owners. Eddie Mabo has made a highly significant contribution to the rights and freedoms of Indigenous Australians as he was the forefather of a long-lasting court case in 1982 fighting for the land rights of the†¦show more content†¦If latitude was adopted it could have caused Aboriginals to demand territory meaning that inhabitants sat on vast mining and economic resources. Additionally, it was possible that 1.5% of the population could have lain claim to around 50% of land area in Australia and the territorial and contiguous seas. If those possible claims were pushed through, the economic and financial costs would have been staggering, followed by severe backlash from non-Indigenous. Dr John Forbes specified â€Å"The High Court in its legislative jurisdiction has done what no single House of Parliament can do, it has passed an open money bill†. (Cooray, 1995). According to Doctor Mark Cooray, the supporters of Mabo were blissfully unconcerned about the consequences for Australian tax payers, consumers and industry. The cost of compensation was already borne by the people of Australia, endangering growing public antipathy to the claimants once the costs became apparent. On the contrary, Native Title became recognised in 141 cases, representing approximately 17% of the Australian continent and in 70% of cases, it was agreed to. (Gordon, 2014). 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