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 progress of the work. A slump test is a method used to determine the consistency of concrete. Slump test is used to find the workability of concrete. A workability test for slip formed concrete pavements marllon daniel cook. 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. Compaction factor test of concrete for low workability concrete. Workability of concrete factors affecting workability of. Various tests for workability of concrete at construction sites i. Workability of concrete is better determined by compaction factor test. The test is incredibly simple and is a great, quick method to check that multiple batches of the same concrete are consistent. Estimating concrete workability based on slump test with.
Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. After mix design, you may have doubt, is this design will be ok. Mix is too wet or high workability mix, slump test isnt appropriate for such mix. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. Factors affecting workability of concrete civil engineering. The stiffness of the concrete mix should be matched to the requirements for the finished product quality. If two consecutive tests shows falling away or shearing off of a portion of the concrete, the concrete probably lacks necessary plasticity and cohesiveness for the slump test to be applicable. Slump is a measurement of concrete s workability, or fluidity.
It is performed to check the workability of freshly made concrete, and therefore. Move the glass disc attached to the swivel arm and place it just on top of the. Despite their inherent limitations, singlepoint workability tests continue to be used for the specification and quality control 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. Compaction factor test of concrete for low workability. It is not a suitable method for very wet or very dry concrete. Workability is largely determined by how fluid the concrete is. Compaction factor test for concrete test for workability. 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 doesnt give accurate results for the low workability of concrete when the slump is field testing 1. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. The slump test is done to make sure a concrete mix is workable. Pdf workability analysis of steel fiber reinforced concrete. The increase in amount of silica fume in concrete reduces the workability of the concrete.
Slump test for concrete to determine its workability. This test known as compacting factor test was developed at road research laboratory england. Tests on concrete concrete slump test, compression test. The slump test was conducted and all the readings are tabulated below in mm. Slump cones and accessories are available bundled as concrete slump test kits for convenience.
It depends on density ratio or compaction and compaction depend on sufficient workability. Sep 11, 2017 slump test gives an idea of only the flowing property of wet concrete and not of the workability. It can also be used as an indicator of an improperly mixed batch. Consistency of concrete is another way of expressing workability but it is more confined to the parameters of water content. A workability test for slip formed concrete pavements. The concrete slump test measures the consistency of fresh concrete before it sets. Procedure to determine workability of fresh concrete by slump test. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. Concrete slump test generally concrete slump value is used to find the workability, which indicates watercement ratio, but there are various factors. Flow table test of concrete also determines the quality of concrete concerning its consistency, cohesiveness and the proneness to segregation. 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. 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 is one of the physical parameters of concrete which affects the finesse.
The development of stable, high workability mixes with a collapsed slump has led to the use of the flow test, more popular in europe, and the slump flow test, used extensively in asia. The strength of concrete is the most important property for us. Concrete slump tests measuring the workability of concrete. Concrete slump tests are a routine procedure carried out on a fresh concrete mix to determine its consistency before it is poured. May 18, 2018 this video animation, animated video explains the procedure for determination of workability by compaction factor test. Although the most common method of determining workability is the slump test, it does not give an accurate result for the concrete with less workability, especially then the workability is less than 50 mm. Workability slump test is used to determine the workability of fresh concrete. Workability of concrete 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 as defined by aci standard 116r90 aci 1990b.
Slump, unit weight, air, and box test did it pass the. Procedures for slump test step by step the whole concrete slump test is performed under the 5 steps. Workability of concrete and factors affecting it civiconcepts. Slump test suitability this method is suitable only for the concrete of high workability. Oct 29, 2015 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. A collapse slump will generally mean that the mix is too wet or that it is a high workability mix, for which the flow table test is more appropriate. Guide to concrete workability concrete slump concrete2you. Fresh concrete must have a workability as compaction to maximum density is possible with a reasonable amount of work. 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. A synthesis of more than 61 existing test methods for workability characterization found that available devices vary widely in their. Flow table test of concrete to test workability of concrete. Hence, an accurate prediction of this property is a practical need of construction engineers. It is an indication of lack of cohesion of the mix. Read my post on how to calculate workability of a concrete mix for more details objective.
Karim kay nasser, a professor at the university of saskatchewan, the kslump tester provides fast, onthespot estimates of fresh concrete slump and workability. Concrete slump test the concrete slump test measures the consistency of fresh concrete before it sets. The slump test is a means of assessing the consistency of fresh concrete. Slump test doesnt give accurate results for the low workability of concrete when the slump is of pfa in scc mortar and concrete 77 4.
Workability of concrete is mainly affected by consistency i. 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. Concrete slump test is carried out to check the uniform quality during. Workability of concrete types and effects on concrete strength. It can also be considered the target flow value, since kistner concrete products appears to be satisfied with the workability of such a mix. Pdf estimating concrete workability based on slump test with.
It is particularly useful for concrete mixes of very low workability or very dry concrete as they are insensitive to slump test. More specifically, it measures concrete consistency between batches. It is discussed earlier that workability of concrete is a complex property. Tyler ley, ashkan ghaeezadah oklahoma state university, oklahoma, united states highlights a novel workability test was developed for slip formed pavements. In this test the amount of compaction obtained by spending a known amount of energy is measured. Concrete workability, quantified by concrete slump, is an important property of a concrete mixture. It is one of the physical parameters of concrete which affects the finesse, strength.
The compacting factor test is conducted to determine the workability of fresh concrete. Coarseness workability consolidation a new approach. Compacting factor test to determine its workability civil. The test is an empirical test that measures the workability of fresh concrete. Coarseness workability consolidation a new approach daniel cook, ashkanghaeezadeh. The 28day split tensile strength test revealed that the inferences of compressive strength test and split tensile strength were somehow similar to one another. Even with the increase in knowledge of concrete rheology, the slump test remains the predominately used test method for measuring concrete workability. 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 cone is placed with the wide end down onto a level, nonabsorptive. A procedure was developed to compare the workability of mixtures using the test. Mar, 2019 the wc ratio, amount and type of aggregate and cement, admixtures, and weather conditions are main factors that affect the workability of concrete. The apparatus used for doing slump test are slump cone and tamping rod. The measured slump must be within a set range, or tolerance, from the target slump. Place the slump cone in the sheet metal pot of the consistometer and fill it with fresh concrete as described in the slump test.
Estimating concrete workability based on slump test with least squares support vector regression. 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. Only conventional measurements, such as slump and vebe test, were used to evaluate the. The ease with which one can use concrete is called workability. Concrete slump test for workability procedure and results. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Slump test procedure is to determine the workability of concrete. As the name suggests, in this test the workability of concrete is determined by examining the flowing property of concrete. Test for workability of concrete slump cone youtube.
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. One test which measures the consistency of concrete is the slump test. It is more sensitive and precise than slump test and is particularly useful for concrete mixes of very low workability as are normally used for concrete to be compacted by vibration, such concrete may fail to slump. Rca are uneven shape, so it reduces the workability of the concrete. Iron pan to mix concrete, weighing machine, trowel slump, cone, scale, and tamping rod. 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.
It does not measure the workability of concrete but it is very useful in. Summary of concrete workability test methods the university of. It can be employed either in laboratory or at site of work. With the exception of the widely used slump test, the few methods that have been studied extensively have generally failed to gain widespread acceptance. No yes put material from slump and box test into mixer.
One of the major problems that you had faced in your field work is concrete compaction during mixing. To determine the workability or consistency of a concrete mix of given proportion by slump test. Concrete slump is generally known to affect the consistency, flowability, pumpability, compactibility, and harshness of a concrete mix. A slump test can be used to measure the workability of concrete.
Workability of concrete and compaction factor test. May 15, 2018 this video animation, animated video explains the procedure for determination of concrete slump test. Thus concrete of the same consistency may vary in workability. In a true slump concrete just subsides shortly and more or less maintain the. The compacting factor test is performed to find out the workability of concrete.
It is used, indirectly, as a means of checking that the correct amount of water has been added to the mix. Additional information on workability and quality of concrete. This works present an experimental study addressing the workability of fiber reinforced concrete frc. Slump test compaction factor test veebee consistometer test 1. Measurement of workability of fresh concrete using a.
Tests on concrete concrete slump test, compression test for. The consistency, or stiffness, indicates how much water has been used in the mix. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction. Concrete slump test procedure applications, types, uses and. The development of stable, highworkability mixes with a collapsed slump has led to the use of the flow test, more popular in europe, and. Vee bee testdefinition and procedure workability of.
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. Procedure for workability test of concrete vee bee test these are the various steps involved in vee bee test procedure. It is performed to check the workability of freshly made. Civil engineering animated videos, civil engineering videos social media. Concrete slump test to determine the workability of concrete mix. Workability of fresh concrete by slump test civil engineering portal. Batch one established the reference slump value for the kistner mix using the standard astm cone test. The test is carried out in accordance with bs en 123502, testing fresh concrete. Standard slump and flow table tests columbia university. Slump is normally measured by filling an abrams cone with a sample from a fresh batch of concrete. In almost every country in the world people refer to the workability of concrete in terms of its slump.
It is used conveniently as a control test and gives an indication of the uniformity of concrete from batch to batch. Testing for the workability of concrete engineering basic. Mar 22, 2018 factors affecting workability of concrete a concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Slump cone test is a simple and traditional test extensively used at sites to assess the workability of the fresh concrete. See chapter 3 concrete testing workability is affected by. Slump test is the most commonly used test of measuring workability of concrete. Slump test of concretecone test procedure workability. Determination of workability test for concrete civil engineering animated videos, civil. Tests for workability of concrete at construction site and. Mar 24, 2020 slump test procedure is performed to check the workability of concrete. The mini slump test is performed for the analysis of flow behavior of cement to check the workability, according to standard astm.