True, when the concrete simply subsides. Workability of concrete measured by three test methods which are the following - 1) slump test in concrete, 2) Compaction factor test, and 3) Vee-bee consistometer test. Also to know is, what is the slump? For example, the Slump Test has been the most specified workability test, but it measures the consistently of fresh concrete to fall under its own weight. Workability of concrete is measured by _____ a) Vicat apparatus test b) Slump test c) Minimum void method d) Talbot Richard test Answer: b Clarification: Work ability of concrete is measured by slump cone test, compaction factor test. Workability is a very important measure of performance, since the fresh state properties of concrete ultimately affects its hardened state properties as well (Mindess et al., 2002). Wet concretes are more workable than dry concrete, but concretes of the same consistency may vary in workability. Vee bee test is usually performed on dry concrete and it is not suitable for very wet concrete. Home; Advanced Surveying - Part 1; Concrete Technology - Part 1; Question: Workability of concrete is measured by. The workability of concrete is an average of the 3 consecutive tests. Workability of fresh concrete paste is measured by three common tests : Slump test; Vee-bee test; Compaction Factor test; Among all three, the most common and effective one is the slump test. The workability of the concrete is defined as how easy it is to mix, place, consolidate, and finish the concrete . Workability can be measured by the concrete slump test, a simple measure of the plasticity of a fresh batch of concrete following the ASTM C 143 or EN 12350-2 test standards. Workability is a complex property, which is very important to estimate, as it defines the ease with which one can handle the concrete and thus will affect the overall efficiency of construction. Hence, it improves the workability of concrete. Question No. The size of fine aggregates does not exceed (A) 2.75 mm (B) 3.00 mm (C) 3.75 mm . The method developed is suitable to determine rheological properties of low-slump concrete. The time taken by the concrete to undergo complete remoulding is determined as a measure of workability of concrete, and it is shown as Vee bee Secs. We can't use the slump test for low workable concretes. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. Therefore, in this research, a workability performance scale was used to determine the . 2) Compacting factor test: The equipment or apparatus used to test the concrete slump is quite simple. Concrete workability can be measured by a variety of methods, but there is no single workability test to measure all important parameters . Principle The slump test result is a measure of the behavior of a compacted inverted cone of concrete under . 124. Question No. Slump is normally measured by filling an "Abrams cone" with a sample from a fresh batch of concrete. Workability is the ability of concrete which refers how easily the concrete can be mixed, transported, placed, compacted and finished with minimal loss of homogeneity. It consist of 2 items - a tamping rod and a truncated cone that's 300 mm tall, 100 mm in diameter at the top, and 200 mm in diameter at the bottom. Slump test is the most commonly used method of measuring consistency of concrete which can be employed either in laboratory or at site of work. Workability can be measured with the help of following three tests : Slump. Here we have listed some of the lab and field tests to measure the workability. Workability is the measure of the properties that fresh concrete possesses and represents the condition in which concrete is present for placement or pouring. Slump test shows an indication of the uniformity of concrete in different batches.The shape of the concrete slumps shows the information on the workability and quality of concrete. It has been noticed that the change in the measured value of workability of concrete due to relative change in water content is independent of the composition of concrete within wide limits. Low workability: slump value 25-50mm or 1-2 inches. You can use the image above to understand the structure of the mould. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. CONCRETE WORKABILITY DURING MIXING TIME Bogdan CAZACLIU - IFSTTAR, France bogdan.cazacliu@isttar.fr . Q. Consistency of concrete is measured with the help of slump test. High workability: slump value 100-175mm or 4-7 inches. arrow_forward. Different Test Methods for Workability Measurement Depending upon the water cement ratio in the concrete mix, the workability may be determined by the following three methods. It's an indirect measurement of concrete consistency or stiffness. Workability is a property of raw or fresh concrete mixture. The workability of concrete by slump test is expressed in mm. Workability of concrete measured by which test. In the United Kingdom, the slump test is measured in accordance with BS EN 12350-2. The test such as flow test, compacting test, Vee-Bee test, and slump cone test are done to determine the workability of the concrete mixture.. Types of Workability. Slump is the measure of concrete consistency and fluidity. In simple words, workability means the ease of placement and workable concrete means the concrete which can be placed and can be compacted easily without any segregation. Many researchers have tried with different parameters to measure the workability of the concrete and later found some of the tests which are very close to check the workability. A concrete which has high consistency and which is more mobile, need not be of right workability for a particular job. We hope this blog post on concrete workability and its related test methods has been helpful. 9. There are various test to measure the workability of the concrete mixture. Shear Slump. Measurement of Workability of concrete or tests for workability of concrete. The use of recycled aggregates (RA) for concrete production usually involves a reduction of the workability as measured by slump. workability in terms of fundamental physical entities, as described in the science of rheology. Answer: Option B . Consistency is the relative mobility or ability of freshly mixed concrete to flow. It is very necessary to be workable concrete. Slump cone is used for medium work ability. Four-inch (4") slump is very common with normal weight concrete and is a good for pumping. Slump test: Slump test is the most general test that is used for the measurement of workability of concrete. Concretes we mostly use in mass dam structures or road pavements have significantly low values of slump. This test consist of a mould that is in the form of a frustum of the cone having the top diameter of 10 cm, bottom diameter of 20 cm and a height of 30 cm. This test is usually performed on dry concrete and it is not suitable for very wet concrete. Answer: Option B . Besides that, the slump test is a static test, whose result is influenced by its own weight and by internal friction between particles . I need the answer as soon as possible. Answer (1 of 7): Workability of concrete is the property of freshly mixed concrete which determines the ease and homogeneity with which it can be mixed, placed, consolidated and finished without segregation and bleeding. Q: Workability of concrete is measured by __________. Options. Slumps for various types of concrete are measured in mm. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. Here, vibration is applied to convert a truncated cone of concrete to a cylindrical shape, and the time taken for this is measured. B) Slump test. A synthesis of more than 61 existing test methods [2] for workability characteriza-tion found that available devices vary widely in their geometry, cost, method of operation, and suitability for field use. One of the basic attributes of any concrete is its workability or "consistence", that is, how easy it is to push one way, pull the other, and float to a smooth level surface. Category: Civil Engineering MCQs. The word "workability" or workable concrete signifies much wider and deeper meaning than the other terminology "consistency" often used loosely for workability. Sub Category: Concrete Technology Mcqs. By: Haseeb Jamal / On: Nov 25, 2017. Design an experiment to measure the workability of the concrete. Concrete Workability Workability is defined as the ease with which concrete can be poured/placed or compacted smoothly without any segregation and bleeding. True Slump. 124. It is easy to work with a highly workable concrete as it can be easily mixed, transported, placed and compacted. The slump test cannot adequately measure the workability of stiff and dry mixes. Remove your feet (the cone is still "fixed" on the plate) and gently lift up the cone straight without vibrations in 5 to 10 seconds. The customary measure of workability is slump. Workability means the ease with which concrete can be moved and placed in forms without segregation. The workability of concrete can be measured using the following methods, 1) Slump test: The slump test is a measure of consistency or the wetness of the concrete mix. Well-graded aggregates help in reducing the voids in the given volume of aggregates. The flow is measured in accordance with BS EN 12350-5. It is useful to check concrete mix batches on site before pouring concrete. Low Workable Concrete; Medium Workable Concrete The Vebe test is better suited for this purpose. Answer: Option D . In the workable concrete mix, the function of water is to lubricate the concrete so that the concrete can be compacted with minimum . The quality of concrete satisfying the above requirements is termed as workable concrete. There are many methods using which you can measure the workability of concrete. Here the concrete maintains the shape of the mold. Definitions related to rheology and workability; 2. D) Talbot Richard test. A) Vicat apparatus test. Following are the methods for measuring the workability of concrete: Slump test. Start your trial now! Simply put, the higher the slump, the wetter the mix. the test . It covers the entire range from the driest to the wettest possible mixtures. Place the cone beside the dropped mass of concrete and by the help of the pestle and the meter measure the highest point (tolerance ± 1 cm.). Category: Civil Engineering MCQs. Without the workability of concrete, we can not transport, place or finish the concrete properly after mixing all ingredients of concrete. The concrete then flows past simulated reinforcing bars and its depth in the trough is measured in two places. Concrete Mix. Vebe test. An increase of water content results in a monotonous increase in workability, but eventually, a state is reached where segregation and bleeding occur, and . There are various test to measure the workability of the concrete mixture. The compaction factor test is done to check the workability of concrete, on the basis of weight ratio between partially compacted to fully compacted concrete. The word "workability" or workable concrete signifies much wider and deeper meaning than the other terminology "consistency" often used loosely for workability. Methods for Measuring Workability of Concrete. Workability is one of the physical parameters of concrete which affects the strength and durability as well as the cost of labor and appearance of the finished product. It was shown by a round-robin test held in 2000 [1,2] that different rheometer designs gave different values of viscosity for the same . When people hear the term "slump," most think about posture; think of concrete slump as "concrete posture." In technical terms, slump is a measured indication of the workability, or flow, of a . 7. QUESTION 6 The slump of concrete is a measure of the: Compressive strength a. Workability b. Modulus of elasticity Tensile strength d. QUESTION 7 The concrete used in pre-cast concrete members is generally Type QUESTIONS In a posttensioned elevated concrete floor, prestressing tendons are combined with conventional steel reinforcement: True False. When the top portion of concrete shears off and slipped sideways indicates harsh mixes like the mix's lack of cohesion. A. ηc = as-measured plastic viscosity of the concrete ηTc = the true or absolute plastic viscosity of the con-crete 1. Thing. Mention the method you are going to use to measure the workability and give the aimed value planned to obtain with the chosen method. Unworkable concrete needs more work or effort to be compacted in place, also 10. Essentially, the more fluid the concrete, the higher . Critical review of the tests available to measure the workability and rheological performance of fresh concrete; 3. Here the general mass of the concrete . ASTM C143 covers the determination of slump. This test is in use in Europe and by some state Departments of Transportation but does not currently have an ASTM test method developed. close. It shows the flow and overall workability of freshly mixed concrete. The characteristics of concrete with respect to the tendency of segregation can be also judged by making a few tamping or blows . Concrete is said to be workable when it is easily placed and compacted homogeneously i.e without bleeding or Segregation. Medium workability: slump value 50-100mm or 2-4 inch. This test is performed to measure the stability or workability of fresh concrete, where the nominal maximum size of the aggregate does not exceed 38 mm, using a slump test apparatus. First week only $4.99! Workability of a concrete mix is measured by Kelly Ball Penetration test Slump cone test Compacting Factor test Ve-be test. hardened concrete. Factors affecting workability of concrete. NOTICE Compacting factor test. B) Slump test. Well-Graded aggregates have a major effect on the workability of concrete. Workability of concrete is measured by (A) Vicat apparatus test (B) Slump test (C) Minimum void method (D) Talbot Richard test . Workability of concrete is measured by 1.Slump test, 2.Vicat apparatus test, 3.Talbot Richard test., 4.Minimum void method B : Slump test Slump Test Compaction Factor Test Vee-bee Consistometer Test 1. Advantages of the Kelly Ball Test. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. So far we have discussed the importance of concrete workability & the factors affecting it. This type of concrete is too stiff and has almost no workability. Question No. Ideally, concrete workability should be characterized The concrete slump test measures the consistency of fresh concrete before it sets. 123. This test is carried out with […] Therefore, this report has four main parts: 1. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. This reduction is mainly due to higher absorption rates, rough-textured surfaces and particles with quite irregular shape from RA. Answer: Option D . The concrete slump test is a simple and easy test that measures the consistency of concrete before it sets. Kelly Ball Test:-Workability of concrete is a complex property of concrete.Finding the workability of concrete requires a huge amount of data and involves lengthy calculations. It is not a suitable method for very wet or very dry concrete. More sample tests could be executed quickly comparing the slump cone test. Vee bee consistometer test determines the mobility and to some extent compatibility of concrete. Concrete rheological properties need to be properly measured and predicted in order to characterize the workability of fresh concrete, including special concretes such as self-consolidating concrete (SCC). To describe concrete flow behavior, both yield stress and plastic viscosity, as defined by the Bingham model, View Answer Explanation. Q: Workability of concrete is measured by __________. C) Minimum void method. Slump test is a laboratory or at site test used to measure the consistency of concrete. Workability of concrete is measured by (A) Vicat apparatus test (B) Slump test (C) Minimum void method (D) Talbot Richard test . Kelly Ball Test:-Workability of concrete is a complex property of concrete.Finding the workability of concrete requires a huge amount of data and involves lengthy calculations. It can also be used as an indicator of an improperly mixed batch. Flow table test. The American Concrete Institute (ACI) sub-committee 236A, "Workability ofFresh Concrete," immediately was faced, upon its creation in fall 1999, with how to determine appropriate methods to . It is suitable for field applications, suitable for concrete with high and medium workability. Workability, a term applied to many concrete properties, can be adequately measured by three characteristics: Compatibility, the ease with which the concrete can be compacted and air void removed. The size of fine aggregates does not exceed (A) 2.75 mm (B) 3.00 mm (C) 3.75 mm . Types, Mechanism. Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. The stiffness of the concrete mix should be matched to the requirements for the finished product quality Slump is a measurement of concrete's workability, or fluidity. Question. This test consists of a vibrating table, a metal pot, a sheet metal cone, a standard iron rod. development of a procedure to measure the workability of freshly mixed low-slump concrete is described in this report. It does not measure all factors contributing to workability, nor it is always representative of the placeability of the concrete. Nevertheless, fresh concrete properties are not always properly measured or predicted. This is a good laboratory test to measure indirectly the workability of concrete. The time required for the shape of concrete to change from slump cone shape to cylindrical shape in seconds is known as Vee Bee Degree. Tests for Workability of Concrete Workability of a concrete mixture is measured by: a) Vee-bee consistometer test b) Compaction factor test c) Slump test The first two tests are laboratory tests while the third test is the field test. The test is popular due to the simplicity of apparatus used and simple procedure. The quality of concrete satisfying the above requirements is termed as workable concrete. Sub Category: Concrete Technology Mcqs. for a known rheology the drag force is a measure of the concrete velocity around the probe Drag force = F (rheology , velocity ) Experimental What is the structure of the flow. This is referred to as "Slump". Workability of concrete is measured in terms of ease with which it can be mixed, transported to construction site, placed in forms and compacted. The test such as flow test, compacting test, Vee-Bee test, and slump cone test are done to determine the workability of the concrete mixture.. Types of Workability. For high work abilities it is not accurate.Slump values vary from 0 . July 11, 2021 by Saad Iqbal. Therefore, the Concrete slump test also known as the Workability Test of Concrete is used on-site to measure the workability of concrete or the degree of fluidity in the concrete mix. 123. What is the slump test in concrete? It can also be used as an indicator of an improperly mixed batch. Poor placem ent or consolidation leads to honeycombing, which reduces compressive strength and increases permeability, thereby leaving the concrete open to chemical attack. Low Workable Concrete; Medium Workable Concrete How is workability measured and specified? Consistency cannot measure workability but it can give indication of workability of concrete. The concrete slump test measures the consistency of fresh concrete before it sets. A) Vicat apparatus test. Slump is normally measured by filling an "Abrams cone" with a sample from a fresh batch of concrete. D) Talbot Richard test. The degree of compaction, called compacting factor is measured by the density ratio. fullscreen Expand. View Answer Explanation. A : Vicat apparatus test. The workability is defined as the amount of work required to place and compact concrete fully. Introduction In the concrete industry, workability is defined as "the ease and homogeneity for which the concrete or mortar can be placed, consolidated and finished" [3]. Workability is a vital property of concrete and related with compaction as well as strength. Workability of concrete is measured in terms of the ease of mixing and placing of concrete.Highly workable concrete can easily be mixed, placed and transported. It is the ratio of the actually achieved density in the test to the density of the same fully compacted concrete. Mobility, ease with which concrete can flow into forms and around reinforcement. Concrete Slump Test This test is carried out with a mould called slump cone whose top diameter is 10cm, bottom diameter is 20 cm and height is 30 cm. All the materials and processes involved in producing concrete affect the workability of concrete. It is the wetness of the concrete and the measure of fluidity or mobility. Most workability tests measure various properties of fresh concrete, but very few tests measure a useful workability property for a certain application. Many researchers have tried with different parameters to measure the workability of the concrete and later found some of the tests which are very close to check the workability. 8. Now its time to analyse the concrete that you made according to the instruction. slump test mould. Because it decides the quality of concrete. The lowest acceptable slump is normally selected in preference to high slump due to a low w/cm and low amount of cementitious material, which are desirable; it also means less likelihood of segregation. Generally, loose wet mixes are more workable than drier mixes, but concrete of the same consistency may vary in workability. Slump Test Values: Very low workability: slump value 0-25mm or 0-1 inch. Workability is largely determined by how fluid the concrete is. of freshly mixed concrete. Vee bee consistometer test is a good laboratory test on fresh concrete to measure the workability in an indirect way by using a Vee-Bee consistometer. We were unable to develop a test method that covered the full range of concrete mixtures, including high performance concrete (HPC). The slump test is not suitable for aggregates over 2 inches which could be done by kelly ball. The workability of concrete depends upon the different factors given below. Question No. Workability can be measured by the concrete slump test, a simple measure of the plasticity of a fresh batch of concrete following the ASTM C 143 or EN 12350-2 test standards. The test is popular due to the simplicity of apparatus used and simple procedure. Also read: CBR test, RQD, COD & BOD Conclusion: The slump test is a way to measure the workability of concrete. Concrete having slump value more than 50mm remoulds quicker where measuring the time is not possible. The cone is placed with the wide end down onto a level, non-absorptive . Workability of concrete is the ease, with which concrete mixes can be mixed, transported, placed in formwork, and compacted completely as possible while using the lowest possible water/cement ratio. Another similar term used to describe a freshly prepared concrete is 'consistency' which is the ease […] Workability test of concrete. The cone is placed with the wide end down onto a level, non-absorptive . Concrete workability. The main measurement of workability, the slump test, is not always Choose the proper workability for the fresh concrete (find from the reference books and standards, and mention your reference in the homework report). Transcribed Image Text. C) Minimum void method. Slump Test Suitability This method is suitable only for the concrete of high workability. If the grading of aggregates is good then there will be less chance of voids in between.
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