Additional information on workability and quality 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. A workability test for slip formed concrete pavements. Slump test of concrete to check the workability of concrete. Hence, an accurate prediction of this property is a practical need of construction engineers. And more importantly, the stepbystep procedure of slump test followed by the list of cautions during the test and way to measure the workability from the test result. Workability of concrete factors affecting workability of. Finding the workability of concrete involves various parameters as workability depends upon stability, mobility, compactibility, place ability and finish ability of concrete. In this experiment the slump test and the compacting factor test were used to assess the. Aug 20, 2019 in slump test, the concrete paste is placed in standard mould called slump cone in 3 layers with each layer compacted by tamping with 25 blows of tamping rod. It is particularly useful for concrete mixes of very low workability or very dry concrete as they are insensitive to slump test. We were unable to develop a test method that covered the full range of concrete mixtures, including high performance concrete hpc. Coarseness workability consolidation a new approach. To check whether the concrete is in workable condition or not, concrete experts carry out concrete slump test.
Flow table test of concrete also determines the quality of concrete concerning its consistency, cohesiveness and the proneness to segregation. This is a good laboratory test to measure indirectly the workability of concrete. Workability of concrete is a complex property of concrete. Minor fluctuation in mixing of concrete ingredients or in concrete mix design can leads to the poor workability of concrete. The concrete slump test is known as standard test method for slump of hydrauliccement concrete and carries the code astm c 143 or aashto t 119. A collapse slump is an indicated of too wet a mix or that it is a high workability mix, for which. Measurement of workability of fresh concrete using a. Since 1922 slump test has been widely used to check out the concrete workability at the site. By measuring the consistency of fresh concrete before it sets, this test can indicate improperly mixed solutions. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. Procedure to determine workability of fresh concrete by slump test. Well, then there is one simple way available that is the slump test.
A slump test can be used to measure the workability of concrete. Various tests for workability of concrete at construction sites i. Other flow characteristics such as viscosity or filling capacity or time of flow through an orifice are needed to characterize flow in scc. It does not measure the workability of concrete but it is very useful in detecting variations in the uniformity of a mix of given nominal proportions. If a shear or collapse slump is achieved, a fresh sample should be taken and the test is.
Compaction factor test of concrete for low workability concrete. The test is carried out in accordance with bs en 123502, testing fresh concrete. It is used, indirectly, as a means of checking that the correct amount of water has been added to the mix. Concrete slump test or slump cone test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the.
Following are the slump test theory, limitation, use, procedure, test apparatus, and precautions. Vee bee consistometer test workability of concrete test. In almost every country in the world people refer to the workability of concrete in terms of its slump. The concrete slump test is referred to in several testing and building code, with minor differences in the details of performing the test. It can also be used as an indicator of an improperly mixed batch. Pdf workability analysis of steel fiber reinforced concrete. Concrete slump test is carried out to check the uniform quality during construction. It is not a suitable method for very wet or very dry concrete.
Workability, slump and compacting factor of concrete with 19 or 38 mm 34 or 1 1 2 in maximum size of aggregate. Fresh concrete is placed in to a hollow steel cone known as a slump cone or abrams cone and using the following procedure, the final slump can be determined. Nevertheless, it is not an adequate tool for assessing lowslump concrete workability. The slump test is a means of assessing the consistency of fresh concrete.
This objective then can be divided into more small objectives by dividing it into the experiment that will be done which are. This test is basically performed to determine the workableness of concrete mix whether it is up to the mark or not. The slump test is the most common method for assessing the flow properties of fresh concrete. In this dry range no variation can be detected between mixes of different workability. Workability is a property of raw or fresh concrete mixture. What are the factors affecting workability of concrete.
Cpccco3053a slump test concrete date this document was. Pdf workability analysis of steel fiber reinforced. This test is performed to measure consistency or workability of fresh concrete, where the nominal maximum size of aggregate does not exceed 38 mm using slump test apparatus. After that immediately, the mould is removed in vertical direction and the subsidence of concrete in workability is the slump of concrete. The slump test is the most widely used test for measuring concrete workability. Slump test doesnt give accurate results for the low workability of concrete when the slump is test used for concrete. A synthesis of more than 61 existing test methods for workability characterization found that available devices vary widely in their. Concrete slump is generally known to affect the consistency, flowability, pumpability, compactibility, and harshness of a concrete mix. The test is performed with the slump cone, originally called the abrams cone, and provides a qualitative measurement of workability but not a. Furthermore, to construct the hybrid model, this research collected a dataset including actual concrete slump tests from a hydroelectric dam. Inspect all materials used in the construction of concrete work at their source, on the job, or both.
Workability is a complex property of concrete which is defined as the ease with which it can be mixed, transported and placed in position within a homogenous state. This method of test specifies the procedure to be adopted. Concrete slump test for workability procedure and results. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. Tests for workability of concrete at construction site and.
Slump test is a laboratory or at site test used to measure the consistency of concrete. Compaction factor test workability test of fresh concrete. This test consists of a vibrating table, a metal pot, a sheet metal cone, a standard iron rod. Concrete slump test the concrete slump test measures the consistency of fresh concrete before it sets. To study the workability determine the consistency of prepared concrete either in the laboratory or laboratory or during the progress of work in the field and to check the uniformity of concrete from batch to batch. Veebee test to determine concrete workability using. It is discussed earlier that workability of concrete is a complex property. The test methods used should be simple, direct and convenient in their application.
The shape of the concrete slumps shows the information on the workability and quality of concrete. Mar 24, 2020 slump test procedure is performed to check the workability of concrete. In a shear slump the top portion of the concrete shears off and slips sideways. Slump is normally measured by filling an abrams cone with a sample from a fresh batch of concrete. 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. Estimating concrete workability based on slump test with.
The concrete slump test is a measure of the workability of fresh concrete. Slump test procedure is to determine the workability of concrete. Flow table test of concrete to test workability of concrete. Concrete slump test procedure applications, types, uses and.
This test plays a vital role in ensuring immediate concrete quality in a construction project. The slump test was introduced in 1918 by duff abrams, a prolific american civil engineer and concrete researcher, as part of his work defining the effects of watercement ratio on concrete strength. The variability of the test was evaluated and two comparisons were made to slip formed pavers. The concrete can provide better functionality, if it is easily positioned and compacted consistently devoid of bleeding or segregation. Concrete slump tests are a routine procedure carried out on a fresh concrete mix to determine its consistency before it is poured. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. K slump test of concrete workability of concrete test. After mix design, you may have doubt, is this design will be ok. It is used to check the workability of freshly made concrete for the easy placement of concrete. The concrete slump test is a very simple procedure to measure the workability of fresh concrete. Compaction factor test of concrete for low workability.
However it has serious drawbacks, especially for selfcompacting concrete scc. The test is popular due to the simplicity of apparatus used and simple procedure. Tests for workability of concrete at construction site and recommended values various tests for workability of concrete at construction sites i. As the name suggests, in this test the workability of concrete is determined by examining the flowing property of concrete. Concrete workability, quantified by concrete slump, is an important property of a concrete mixture. Concrete slump tests measuring the workability of concrete. Workability measurement concrete technology questions. Workability of concrete definition factors affecting. Factors affecting workability of concrete civil engineering. This works present an experimental study addressing the workability of fiber reinforced concrete frc. Concrete slump test procedure applications, types, uses. The concrete slump test is done to check the workability of concrete. Introduction the concrete slump test just like compacting factor test measures the consistency of fresh concrete before it sets.
Jun 10, 2015 slump test of concrete to measure workability slump cone test of fresh concrete object. To investigate the paste setting time of cement plus pfa. The slump test cannot adequately measure the workability of stiff and dry mixes. This standard has been prepared with this object in view and provides a guide to the sampling, analysis, and determination of linear. The test is incredibly simple and is a great, quick method to check that multiple batches of the same concrete are consistent. Aug, 2017 official website in this video i am going to show you how we perform slump test on site. Slump test doesnt give accurate results for the low workability of concrete when the slump is mar 17, 2018 hello friends, in this video we will learn, how measure slump value by slump cone test. High workability concrete requires little compactive effort, yet does not segregate. Slump test of concretecone test procedure workability of. Concrete workability, high performance concrete, slump, compacting. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Aggregate grading size distribution nature of aggregate particles shape, surface texture, porosity etc. The mini slump test is performed for the analysis of flow behavior of cement to check the workability, according to standard astm.
Only conventional measurements, such as slump and vebe test, were used to evaluate the. Concrete slump test the concrete slump test is an onthespot test to determine the consistency as well as workability of fresh concrete. Concrete slump test stepbystep procedure, apparatus, and. Workability of concrete determination by slump test. The compaction factor test is carried out to measure the degree of workability of fresh concrete with regard to the internal energy required for compacting the concrete thoroughly. Summary of concrete workability test methods the university of. The slump test is widely used to evaluate the workability of concrete. Concrete that is stiff or dry may be difficult to handle, place, compact, and finish and, if not constructed properly, will not be as strong or durable when finally hardened. Here, vibration is applied to convert a truncated cone of concrete to a cylindrical shape, and the time taken for this is measured. Slump test shows an indication of the uniformity of concrete in different batches. Because it involves lowcost tools and can be quickly done in situ, it is used extensively on most construction sites. Concrete slump test to check workability of concrete.
Factors affecting the workability of concrete incorporating pfa mahathir bin merjedi this project is submitted in partial fulfilment of the requirements for the degree of bachelor of engineering with honours civil engineering faculty of engineering universiti malaysia sarawak 2005. Procedure of slump test on concrete constructionfeeds. Generally, the veebee test is best suited for concrete mixes that have low or very low value of workability. Factors affecting workability of concrete a concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. In a true slump the concrete simply subsides, keeping more or less to shape. This test works on the principle of determining the degree of compaction achieved by a standard amount of work done by allowing the concrete to fall through a standard height. Slump test the slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as the true slump, shear slump or collapse slump is achieved, a fresh sample should be taken and the test repeated. Work ability of concrete is measured by slump cone test, compaction factor test.
Fill box test for self compacting concrete for workability. Pdf estimating concrete workability based on slump test with. Making an excellent workable concrete involves many factors and finding the workability of concrete is a huge task for civil engineers which involves lengthy calculations. What is workability of concrete and what are tests is generally performed at site for its determination.
To investigate the paste consistency of cement plus pfa. The method developed is suitable to determine rheological properties of low slump concrete. Pdf effect of superplasticizer dosage on workability and. The tests considered for study are, slump test and compressive strength test the results show that the increase of superplasticizer dose in concrete leads to gain of good ability in addition to slump. In a lean mix with a tendency to harshness a true slump can easily change to the shear slump or even to collapse. One of the major problems that you had faced in your field work is concrete compaction during mixing. It is performed to check the workability of freshly made. Slump test procedure is performed to check the workability of concrete. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. Same box test performance was found if the wr was added up front or if added in small dosages if the sample did not pass the box test within one hour it was discarded the box test has correlated well with field paving mixes work is ongoing with multiple operators.
The commonly used standard tests for workability of ordinary fresh concrete, such as the slump test or the flow spread test, are inadequate. Apr 30, 2016 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. Slump test measures the consistency or workability of concrete. The cone is placed with the wide end down onto a level, nonabsorptive. The concrete slump test is an onthespot test to determine the consistency as well as workability of fresh concrete. Concrete slump test to check the workability of concrete. If this test is being carried out in the field, the sample mixed concrete shall be. Fill box test for self compacting concrete for workability fill box test method for self compacting concrete fill box test is also known as kajima test is used to measure the filling ability of self compacting concrete with a maximum aggregate size of 20 mm. The concrete slump test measures the consistency of fresh concrete before it sets. In the united kingdom, the standards specify a slump cone height of 300 mm, a bottom diameter of 200 mm and a top diameter of 100 mm. Estimating concrete workability based on slump test with least squares support vector regression. It is performed to check the workability how easily concrete can be placed and compacted of freshly made concrete, and therefore the ease with which concrete flows. In the freshly prepared cement paste, small particles interact via colloidal forces, such as vander waals, electrostatic repulsion, steric hindrance, and hydrogen bonding, and some bigger particles interact via direct contact like friction or collisions. The apparatus used for doing slump test are slump cone and tamping rod.
Also, a procedure was developed using the test for com. The characteristics of concrete with respect to the tendency of segregation can be also judged by making a few tamping or blows. The time required for the shape of concrete to change from slump cone shape to cylindrical. Engineering society its the first platform for all engineers we share good technical articles and free pdf ebooks and free excel spreadsheets for all engineers. The use of highly fluid concretes, the rheology of which cannot be suitably characterized with the slump test astm c 143 alone, has resulted in the emergence of many new methods for characterizing the flow of freshly mixed concrete. Estimating concrete workability based on slump test with least. Slump test is used to determine the workability of fresh concrete. The reason for the popularity of the slump is that the equipment is light and portable and the test is simple and easy to carry out. Another similar term used to describe a freshly prepared concrete is consistency which is the. The compacting factor test is performed to find out the workability of concrete. The slump test is basically a measure of the consistency of fresh concrete or its workability.
Workability can therefore be defined as the amount of internal work needed to fully compact fresh 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 123502 test standards. And what are its recommended values for different purposes. Slump test 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. Flowing concrete usually drops to onethird or less of the original height in the slump test, and the result is a collapsed heap, the height of which is likely to be determined by the angle of repose of. Concrete test factors affecting workability of concrete.
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