Slump Test With Relevant British Standards

Slump Test With Relevant British Standards Describe the slump test in accordance with relevant British Standard and indicate why it is an important test. How would concrete workability be determined if the concrete is required to be very dry? In accordance with relevant British Standards (BS EN 12350-2:2009), the slump test is important as it determines the consistency of fresh concrete. The fresh concrete is compacted into a mould in the shape of a cone. When the cone is withdrawn upwards, the distance the concrete has slumped provides a measure of the consistency of the concrete. This is the basic principle of the slump test. The sample of the concrete is obtained in accordance with BS EN 12350-1(British Standards Institute, 2009a). When undertaking the task of the slump test, the mould and base plate are dampened and the mould is placed on the horizontal base plate. During filling of the mould, it is held firmly against the base plate by clamping in place or by standing on the two foot pieces. The mould is filled in three layers, each approximately one-third of the height of the mould when compacted. Each layer is compacted with twenty five strokes of the tamping rod. The strokes are uniformly distributed over the cross section of each layer. For the bottom layer the rod is slightly inclined and positioned approximately half the strokes towards the centre. The first layer is compacted throughout its depth, taking care in not striking the base. The second layer and the top layer are compacted throughout its depth, so that the strokes just penetrate into the immediately underlying layer. In filling and compacting the top layer, the concrete is heaped above the mould before tamping is started. If the tamping operation of the top layer results in subsidence of the concrete below the top edge of the mould, then more concrete is added to keep an excess above the top of the mould. After the top layer has been compacted, the surface of the concrete is struck off by means of a sawing and rolling motion of the compacting rod (British Standards Institute, 2009b). Subsequently, the spilled concrete is removed from the base plate. The mould is removed from the concrete by raising it carefully in an upwards direction. Immediately after removal of the mould, the slump is measured and recorded by determining the difference between the height of the mould and that of the highest point of the slumped test specimen as shown in figure 1. The consistency of a concrete mix changes with time. This is due to hydration of the cement and loss of moisture. Thus, tests on different samples should be carried out at a constant time interval after mixing, if comparable results are to be obtained (Wikipedia, 2010a). The test is only valid if it yields a true slump. This is the slump in which the concrete remains substantially intact and symmetrical as shown in Figure 2(a). If the specimen shears, as shown in Figure 2(b), another sample is taken and the procedure repeated. If two consecutive tests show a portion of the concrete shearing off from the mass of the test specimen, then the concrete lacks the necessary plasticity and cohesiveness for the slump test to be suitable. This is why the slump test is important and appropriate for concrete mixes of medium and high workability concrete. There are other tests to establish workability of concrete. If the concrete is required to be very dry, then this will depend on the water/cement ratio (w/c) of the mixture which has a control over the final properties of the concrete. Selection of a w/c ratio gives the engineer control over two desirable properties. These are strength and workability. A mixture with a high w/c will be more workable than a mixture with a low w/c i.e. it will flow easier. The less workable the mixture, the stronger the concrete will be. The water/cement ratio needs to be about 0.25 to complete the hydration reaction. Typical values of w/c are between 0.35 and 0.40 because they give a good amount of workability without sacrificing a lot of strength (Concrete, 2010). The vebe test is appropriate for concrete mixes of low and very low workability. This method is a mechanised variation of the slump test and determines the workability of concrete. The concrete is subjected to vibration after removal of the slump cone. It is then mounted upon a vibrating table operating at a fixed amplitude and frequency. The time to complete the required vibration gives an indication of the concrete workability. The vebe test is done in accordance to BS EN 12350-3:2009 (British Standards Institute, 2009e). Workability of fresh concrete and the fluidity of the concrete at different water/cement ratio will affect the casting and finishing of the concrete specimen. Strength of the concrete will also be affected. Concrete workability can be determined by many methods. This includes confined flow test methods e.g. compacting factor test, free flow test methods. These methods include slump test and vibration test methods e.g. the vebe test as previously mentioned (ELE International, 2010). (816 Words) In concrete mixing, describe briefly the mixing procedure. Why concrete is being mixed in dry state for 60s first, then after water is added and further mixed for 90s? Concrete is formed by mixing cement, coarse aggregate, fine aggregate and water. This is with or without the incorporation of admixtures and additions, which develops its properties by hydration of the cement. Mixing the water with the cement glues the aggregate together, fills voids within it, and allows it to run more easily. The object of mixing concrete is to coat the surface of all aggregate particles with cement paste and to blend all the ingredients of concrete into a uniform mass. This uniformity must not be disturbed when discharging from the mixer (Neville, A. M, 1981a, p226). With concrete, there is an inclination on site to mix it as quickly as possible. It is therefore important to know what the minimum mixing time necessary to produce a concrete uniform in composition and of satisfactory strength. The time varies with the type of mixer and number of revolutions which is the criteria for adequate mixing and not essentially the mixing time. The are three main options for mixing concrete. These options are mixing by hand, which is probably only suitable where less than about  ¼m ³ of concrete is required; using a cement mixer, which is generally suitable where between about  ¼m ³ and 2m ³ of concrete is required; and finally buying in ready mix for jobs requiring more than about 2m ³ of concrete which is best and cost effective to buy in a lorry load of ready mixed concrete. The above quantities are only rough guidelines (Practical DIY, 2010). With mixing concrete, the mixing procedure includes the loading method, the discharge method, the mixing time, and the mixing energy. The loading method includes the order of loading the constituents into the mixer and also the duration of the loading period. The duration of this period depends on how long the constituents are mixed dry before the addition of water and how fast the constituents are loaded. The loading period is extended from the time when the first constituent is introduced in the mixer to when all the constituents are in the mixer. Dry mixing is the mixing that occurs during loading but before water is introduced. Wet mixing is the mixing after or while water is being introduced, but still during loading. This means that materials are introduced any time during the loading period: all before the water, all after the water, partially before and partially after. The loading period is important because some of the concrete properties will depend on the order in which t he constituents are introduced in the mixer. The discharge from the mixer should be arranged so that it increases productivity and it does not modify the homogeneity of the concrete (Concrete-Catalog, 2010). Figure 3 shows the relationship between the range of strengths of the specimen made from the given mix after a specific mixing time. Figure 3 is based on Shalons tests. It shows how compressive strength is affected by the mixing time. It also shows the minimum, mean and maximum values (Neville, A. M, 1981b) Figure 4 shows the same tests but plotted as a coefficient of variation against mixing time. From the graph it shows that mixing for less than sixty seconds and ninety seconds produces a noticeably more variable concrete. Prolonging the mixing time beyond the values results in no significant improvement in uniformity. (Neville, A. M, 1981c) This would suggest why the mixing process is no less than sixty seconds and ninety seconds for each process e.g. when mixing the dry state for sixty seconds then adding water and mixing for a further ninety seconds. Figure 5 shows the results of Abrams tests. It shows how the average strength of concrete also increases with an increase in mixing time. The rate of increase falls quickly beyond one minute and is not significant beyond two minutes with sometimes a slight decrease in strength been observed (Neville, A. M, 1981d). This would suggest why concrete is mixed in dry state for sixty seconds first as the strength falls quickly beyond this and why after water is added it is mixed for a further ninety seconds. This is because the strength increase would not be significant beyond this time with a slight decrease in strength observed as stated earlier. The influence of mixing time from thirty seconds to one minute permits a saving in the cement content of as much as thirty kilograms per cubic metre. This was calculated by Shalon which shows how within the first minute the influence of mixing time on strength is of significant importance. This would assist the fact why the concrete is mixed for sixty seconds first. Thus saving cement content which would have an effect on strength as well as cost. With the concrete being mixed in a dry state for 60 seconds, then water added and further mixed for 90 seconds, there are no universal rules in the order to add the water and concrete. This can depend on the properties of the mix and the mixer. The mixing time is from the time all the solid materials have been put in the mixer. When a dry mix is used however, it is necessary to feed some water and the coarse aggregate as otherwise the surface does not become adequately wetted. If the coarse aggregate is not present to begin with then sand or the cement could become stuck in the mixer. If the cement or water is fed too fast then balls may form. Normally, a small amount of water should be fed first followed by the materials. These are, if possible fed simultaneously into the mixer. The greater part of the water should be fed during the same time if possible with the remainder fed after the solids (Neville, A. M, 1981e). With stiff mixes, it is found to be suitable to feed the sand first, part of the coarse aggregate, cement, then the water and lastly the remainder of the coarse aggregate to break up any round masses of mortar (Neville, A. M, 1981f). (1,022 Words) Describe different ways to be applied to cure concrete on site Curing concrete on site can be done using many methods. These include retaining formwork in-situ, constant fog spraying, ponding, polythene sheet, steam cure, hydrothermal processes and surface applied materials. Fogging during and after placing and finishing also helps minimize plastic cracking in concretes with very low water-cement ratios. This is especially around a water-cement ratio of 0.30 or less (Curing Concrete, 2010). Ponding as a curing method is easily done. A waterproof wall is needed to form around the concrete, using either the form the concrete was poured into, or a wall of sandbags. Once the wall is formed, the concrete is flooded with water. The added moisture from the flood will keep the concrete from drying out before the bonding process is completed (E-How, 2010). Airtight polythene sheeting is an efficient way of preventing moisture loss. It should be placed on a concrete slab as soon as the concrete is hard enough to prevent surface damage or marking. With sprayed membranes, these are designed to form a superficial seal on the concrete, preventing water evaporating. Although some prevent subsequent adhesion of screeds or applied finishes (BRMCA, 2010a). Steam curing is a process for hardening concrete that involves exposure to warm steam. Steam curing requires a fraction of the time involved with traditional curing and quickly strengthens the products so they can be used immediately (Wisegeek, 2010). (218 Words) Why is curing important? Curing is important to prevent concrete from drying out too soon. Well cured concrete is stronger, more resistant to chemical attack and traffic wear. It is also more watertight with curing. It withstands freezing and abrasion better with the processes of curing. Most curing is done by using polythene sheeting or a sprayed membrane. Leaving the formwork in place is also possible, except for slabs, where the large surface area will soon dry if left unprotected. Curing should always start before the concrete begins to dry out and continue for a period depending on the strength gain of the concrete. Poor curing will result in poor concrete, lower strength, lower durability, dusty surface and a weaker surface (BRMCA, 2010b). To obtain good concrete it must be cured in a suitable environment to allow the concrete to achieve its strength. Hydration and hardening is critical for the first three days. Curing is important In order for sufficient heat and humidity to be maintained within the mix during hydration. Curing allows concrete to achieve its strength, minimise cracking, minimise shrinkage and prevent losses of water. Well cured concrete has better surface hardness and therefore is more watertight. Concrete needs to be cured under controlled temperature and humidity in order to obtain good concrete (Wikipedia, 2010b). As previously discussed, sufficiently cured concrete will exhibit greater durability, wear resistance, and gain strength faster. Cured concrete will also have better resistance to freeze thaw damage. Improperly cured concrete can be subject to plastic shrinkage cracking (loss of moisture from fresh concrete) and drying shrinkage (loss of moisture from concrete that has set) among other undesired side effects (All Concrete, 2010). Curing is of particular importance on horizontal surfaces; dry, hot or windy conditions; wear resistant floors; and high strength floors. Abrasion resistance is dependent on good curing but also relies on other factors (Newman, J and Choo, B, 2003). (301 Words) Discuss the use of recycled concrete aggregate in concrete Recycled concrete aggregate is aggregate resulting from the processing of inorganic material previously used in construction and principally comprising crushed concrete (British Standards Institute, 2006). The process of recycling of concrete is a fairly straightforward process. It involves breaking, removing, and crushing existing concrete into a material with a specified size and quality. The quality of concrete with recycled concrete aggregate (RCA) is dependent on the quality of the recycled material used. If there is reinforced steel and other embedded items, these must be removed, and care must be taken to prevent contamination by other materials that can be difficult, such as asphalt, soil, chlorides, glass, paper, plaster, wood etc. The removal of the contaminants is done through selective demolition, screening, air separation and size reduction which is done in a crusher to aggregate size. After this, the crushed concrete can be used as new concrete for pavements, sidewalks, curbs, gutters, structural grade concrete and also bituminous concrete (Concrete Technology, 2010). The use of recycled concrete material (RCM) as an aggregate substitute in pavement construction includes its use in granular and stabilized base, engineered fill and Portland cement concrete pavement applications. Other applications include its use as an aggregate in flowable fill, hot mix asphalt concrete and surface treatments. To be used as an aggregate, RCM must be processed to remove as much foreign debris and reinforcing steel as possible as discussed previously. Reinforcing steel is sometimes removed before loading and hauling to a central processing plant. Most processing plants have a primary and secondary crusher. The primary crusher breaks the reinforcing steel from the concrete and reduces the concrete rubble to a maximum size of 75 mm to 100 mm. As the material is conveyed to the secondary crusher, steel is removed by an electromagnetic separator. Secondary crushing further breaks down the RCM, which is then screened to the desired grade. To avoid inadvertent segregation of particle sizes, coarse and fine RCM aggregates are stockpiled separately (TTHRC, 2010). Recycled concrete aggregates can be used in many things. With bitumen bound materials, recycled concrete aggregate can be used in a variety of base course and binder course mixtures. In concrete, recycled concrete aggregate is permitted for use in certain grades of concrete. In pipe bedding, a suitably graded recycled concrete aggregate is used. In hydraulically bound mixtures (HBM) recycled concrete aggregate can be suitable for use in HBMs with suitably graded recycled concrete aggregate used as a subbase. In capping, recycled concrete aggregate is suitable for capping applications and embankments. Suitably graded recycled concrete aggregate can also be used as fill (Wrap, 2010). With regards to RCA properties, research carried out in Australia indicates that in general, recycled concrete can be used as natural aggregate in ready mixed concrete with satisfactory performance for low grade concrete. There are also marginal differences in compressive strength and a 10% reduction in strength characteristics. The issues are due to drying shrinkage which is higher compared with natural aggregates as well as a 10% difference in tensile properties (Guy R. Woolley, 2000). Waste arising from construction and demolition constitutes one of the largest waste streams within the European Union and many other countries. Construction demolition waste has become a global concern which is why a sustainable solution is needed. This is why recycled concrete aggregate (RCA) should be promoted, although the aggregate for concrete applications must meet the requirements set in relevant specifications for its particular use. Recycling and reuse of demolition waste may not always be economic or practical and in some cases may be impacted by the external issues i.e. regulatory and planning controls. If the construction industry and its need for aggregates are considered, then recycling of concrete would give both economic and environmental benefits as well as making the construction industry more sustainable (M C Limbachiya et al, 2004). (673 Words)

Growth of Sammy in John Updikes A&P :: A&P John Updike

The Growth of Sammy in Updike’s A & P  Ã‚  Ã‚  Ã‚  Ã‚   In the story "A&P," by John Updike, the main character Sammy makes the leap from an adolescent, knowing little more about life than what he has learned working at the local grocery store, into a man prepared for the rough road that lies ahead. As the story begins, Sammy is nineteen and has no real grasp for the fact that he is about to be living on his own working to support himself. Throughout the course of the story, he changes with a definite step into, first, a young man realizing that he must get out of the hole he is in and further into a man, who has a grasp on reality looking forward to starting his own family. In the beginning, Sammy is but a youth growing up learning what he knows about life in small town grocery store. His role models include, Stokesie, the twenty-two year-old, supporting a family doing the same job Sammy does yet aspiring to one day have the manager's position, and Lengel, the store manager who most certainly started out in the same place that Stokesie an d he were already in. Stoksie, the great role model, continues to be as adolescent as Sammy, with his "Oh, Daddy, I feel so faint," and even Sammy sees this noting that "as far as I can tell that's the only difference (between he and I)." Sammy whittles away his days looking at pretty girls and thinking about the ways of people. He hardly realizes that this is how he will spend his entire existence if he doesn't soon get out of this job. During this day that will prove to change his life, he makes the step towards his realization. He decides that he doesn't want to spend the rest of his life working at an A&P competing for the store manager's position. Sammy thinks to himself about his parent's current social class and what they serve at cocktail parties. And, in turn, he thinks about what he will be serving, if he stays at the A&P, "When my parents have somebody over they get lemonade and if it's a real racy affair Schlitz in tall glasses with 'They'll Do It Every Time' cartoons st enciled on." He must get out and the sooner the better. He is still just an adolescent who hasn't completely thought through his decision and yet his mind is made up.

Stanislavski- Method Acting and Its Importance

Stanislavski and ‘The Method’ â€Å"To become a successful actor one must erase personal experience and emotions and build their character from nothing. † – Lee Strasburg. Konstantin Sergeyevich Alexeyev was born in Moscow, Russia in 1863. He was first seen on stage at the age of seven and at the age of twenty-one he changed his stage name to Konstantin Stanislavski. He was founder of the first acting â€Å"system†, co-founder of the Moscow Theatre (1897), and a renowned practitioner of the naturalist school of thought. In 1987 he also met Russian playwright, Anton Chekov.Stanislavski’s process of character development, the â€Å"Stanislavski Method†, was the means for method acting. It was, and still is, the most influential acting system on the modern stage and screen. After enrolling at Moscow’s Drama School, he left after three weeks of not being satisfied with the training. Back then, rehearsals were very casual. Actors woul d walk on stage and deliver their lines with the text in front of them. There was no attempt in making the acting a reality. He felt the need to change theatre and thought that it was important that the actor’s skill should involve more than shallow techniques.The acting needs to have genuine feeling. To give the audience feeling we must first create the feeling for ourselves. This is why personal experiences are important as they possess what we have felt in the past, present and future. We can re-collect emotions such as happiness or sadness and use these to act with feeling and convey a message to the audience. Humans have many emotions that they mask at one time. In class, students are shown experiential learning. Methods and activities such as; Emotional recall and Lady Macbeth (Act 1, scene 7) can help actors create appropriate actions, thoughts and emotions for certain characters or scenes.In emotional recall, students were to recall something, where at that moment the ir lives changed or made them feel something they would never forget. Most were sad, but people tried to hold back tears while trying to speak. Most of the time the tears would just eventually flow and this gave students the sense of method acting. Collecting personal experiences helped them act with a sense of feeling and emotion. When creating a character you may need personal experiences although, you must wipe out idiosyncrasies to create an original character.Exercises such as; ‘slaps’ and ‘milling and grooving’ helped students show a part of their idiosyncrasies. ‘Slaps’ required all concentration and this established how a student would react throughout the exercise. ‘Milling and grooving’ was being able to make a connection with the eyes and communicating without speaking a word. These exercises helped maintain control and focus, while showing their idiosyncrasies without realising it. There are many techniques that have be en learnt in the Stanislavski system in relation to Lee Strasburg’s statement. Stanislavski’s method was to encourage actors to become artists in their own right.Stanislavski had to design a method to inspire his three-part System. This is now known as ‘method acting', the mechanisms used to take on a role are varied, but all focus on making an actor put their own experience, imagination and feeling into a role. Strasburg taught Stanislavski’s system, but is famous for the â€Å"Method† that he developed at the Group Theatre (although the term â€Å"method acting† generally refers to the use of Stanislavski’s system in America – â€Å"Method† with a capital M refers specifically to Strasberg’s approach). The ‘Method’ was used to create reality within an actor.Lee Strasberg suggested to the students and theatre film performers to â€Å"try not to act, be yourself, use gesture in a manner that you use i n private life. † Stanislavski wanted acting to feel and be real. Some exercises in class were; ‘Circle of attention’ and ‘beats and thoughts’. Circle of attention was making a connection with the eyes without speaking, where you had to concentrate on a set of eyes and move when the time was right. There was an inner and outer circle. If a student was about to move, the person from the outside circle could tap the student and stop them from moving. This maintained focus. Beats and thoughts’ is a skill where the actor breaks down a scene into â€Å"beats† or â€Å"bits,† short sections that end with each change of objective. Take out all your idiosyncrasies and make characterisation for your role. Break up each line and give it meaning, using pauses where necessary. This will give you the effect you need. We do this, because we must make the piece as convincing as possible and make your audience believe what you are saying, or doin g is real. You must incorporate lights and shades for the dramatic side to take effect. You need to be able to produce a convincing tone so the actions can flow when you act.As a student studying drama this made me feel like I could portray or master any character thrown at me. Beats and thoughts created emotion and characterisation that was needed to create and portray any necessary role. Method acting needs to be portrayed in theatre. Without it, the audience wouldn’t be moved by the performance. The world is better for it. Actors can persuade, make people laugh, cry, surprised, frightened, all by using method acting. Lee Strasburg’s statement is false although to act correctly you must wipe out idiosyncrasies but keep the truth (personal experiences) of emotions.This makes method acting the most influential acting system around the world. Bibliography Copyright 2011 Bradley Bishop and Trevor Jones http://www. kryingsky. com/Stan/Biography/bot. html (Last accessed 14 th March 2012) h2g2 – 2012 http://h2g2. com/dna/h2g2/A5133151 (Last accessed 14th March 2012) 2008, All rights reserved, Jamactors. com http://www. jamactors. com/articles/method_acting. php (Last accessed 14th March 2012) Class Drama Notes 2012 (Last accessed 14th March 2012) Shanelle Fairhall

Essay on The Shaping of the U.S. Constitution - 2037 Words

In the initial years of the United States a meeting of delegates appointed by the several states met for the sole purpose of revising the Articles of Confederation. The result of this meeting was the creation of the U.S. Constitution that would soon become the ultimate directive for both Federal and State Governments. Since its birth it has been revised, amended, and ratified in order to solidify the allocation of power between the separate branches of government. Although this may be the case, distribution of the powers has been disputed ever since the formation of the Constitution. These political, legal, and quasi-legal constitutional disputes triggered civil unrest and led to explicit acts of opposition involving nullification and†¦show more content†¦Nullification considered by some, as the proper exercise of a state’s constitutional right to limit federal powers, is debated by others as the definitive unbalancing of the powers given to the state by the U.S. Cons titution and Bill of Rights. Federalism: Nation v. State When the government first achieved independence from England there were thirteen individual governments. They had an agreement called the Articles of Confederation that specified how each would interact with the others and manage the states. Despite the ratification by every state the agreement soon became problematic. What ensued was the meeting of state delegates, known as the Constitutional Convention, who planned to revise the problems. As a result the U.S. Constitution was fashioned to take its place. The idea was to ultimately federalize the States. That means each State remains an individual government but also agrees to be part of a Union. Thus created a federal government that would handle those things that are best controlled by a central government, which acts on behalf of the many States. An example would be the Navy and Army. The Federal Government has the right to raise and maintain a full time standing military. The Federal government is not limited to just the enumera ted powers granted to Congress. It was also arranged that the national government would have powers not specifically stated in the Constitution, called implied powers. Although popularShow MoreRelatedThe United States And The Native Americans Essay1594 Words   |  7 Pagesare a lot more complex interactions once thoroughly examined. The U.S, once a colony of the Europeans, eventually grew into the strong standing nation that it is today. 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