Standard slump and flow table tests objective to determine the reference slump value for kistner concrete mix design and to calibrate it against an equivalent measure using a flow table. Workability of concrete factors affecting workability of. 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. 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. The commonly used standard tests for workability of ordinary fresh concrete, such as the slump test or the flow spread test, are inadequate. Tools and apparatus used for slump test equipment 1. As the name suggests, in this test the workability of concrete is determined by examining the flowing property of concrete. Each batch and mix was evaluated to obtain the workability by slump test as shown in fig. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete.
The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total volume. Use of aggregates which are round and have smooth surfaces increases the workability. Concrete is said to be workable when it is easily placed and compacted homogeneously i. Workability of concrete and factors affecting it civiconcepts. And what are its recommended values for different purposes. If necessary, modify sampling procedures to fit a specific situation. It depends on density ratio or compaction and compaction depend on sufficient workability. Slump test doesnt give accurate results for the low workability of concrete when the slump is 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. Batch one established the reference slump value for the kistner mix using the standard astm cone test.
Procedure for workability test of concrete vee bee test these are the various. Pdf predicting the workability of fresh concrete using simple. Pdf properties of highworkability concrete with recycled. Procedure for workability test of concrete vee bee test these are the various steps involved in vee bee test procedure. See chapter 2 concrete properties the compression test. 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.
The consistency test of concrete is one of the important tests in the concrete slab. Koehler university of texas at austin austin, tx david w. This test consists of a vibrating table, a metal pot, a sheet metal cone, a standard iron rod. A workability test for slip formed concrete pavements marllon daniel cook. Workability is a vital property of concrete and related with compaction as well as strength. Compaction factor test is designed in such a way that it can be used only in laboratory but in some cases, it can be used for field concrete tests. Workability of concrete and compaction factor test. Slump test of concrete workability of concrete official website. Concrete slump test the concrete slump test measures the consistency of fresh concrete before it sets. The strength of concrete is the most important property for us.
The wc ratio, amount and type of aggregate and cement, admixtures, and. The measured slump must be within a set range, or tolerance, from the target slump. Perform correlation tests several times throughout the day. Procedure to determine workability of fresh concrete by slump test. The impact of addition of mpw on workability is discussed in the section 17. The apparatus for the vebe test is shown in figure 3.
The use of chemical admixtures in concrete is a common solution to achieve full compaction particularly where reinforcement congestion and shortage of skilled workers. For the astm c143 and aashto t 119 slump test, a slump cone is placed on a solid, level base and filled with fresh concrete in three equal layers rodded in a specified manner to consolidate. Veebee test is a good laboratory test suitable for stiff concrete mixes having low and very low workability. A mould provided with a suitable guide attachment may be used. The sample then settles, or slumps, and the final height is subtracted from the original height of the. The compacting factor test has been developed at the road research laboratory in. It is discussed earlier that workability of concrete is a complex property.
Nemati winter quarter 2015 5 cm 425 concrete technology 9 slump test cm 425 concrete technology 10 properties of fresh concrete the most important properties of fresh concrete are thus associated with its workability and consistency. Civil engineering animated videos, civil engineering videos social media. Factors affecting workability of concrete civil engineering. Compaction factor test workability of concrete the. Measuring the workability of high fines concrete sponsored by. Compaction factor test of concrete for low workability concrete. Place the slump cone in the sheet metal pot of the consistometer and fill it with fresh concrete as described in the slump test. Mix the concrete at agitating speed for all revolutions over 150. The slump is carried out as per procedures mentioned in astm c143 in the united states, is.
Vee bee testdefinition and procedure workability of. A procedure was developed to compare the workability of mixtures using the test. To determine the workability of fresh concrete by compacting factor test as per is. The past researchers have been underscored the use of chemical admixtures imparts. This is a good laboratory test to measure indirectly the workability of concrete. It can also be used as an indicator of an improperly mixed batch. Concrete slump test for workability procedure and results. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction. Fresh concrete must have a workability as compaction to maximum density is possible with a reasonable amount of work. Flow table test of concrete also determines the quality of concrete concerning its consistency, cohesiveness and the proneness to segregation. Additional information on workability and quality of concrete can be obtained by observing the manner in which concrete slumps. Tests on concrete concrete slump test, compression test for.
Arulsivanantham and gokulan 2017 define selfcompacting concrete as a new category of highperformance concrete that is characterized by its high workability, which ensures a. The concrete then flows past simulated reinforcing bars and its depth in the trough is measured in two places. Computer simulation would allow for an economic approach to such problems and could unify at. This video animation, animated video explains the procedure for determination of workability by compaction factor test. A novel workability test was developed for slip formed pavements. May 15, 2018 this video animation, animated video explains the procedure for determination of concrete slump test. Even with the increase in knowledge of concrete rheology, the slump test remains the predominately used test method for measuring concrete workability. Fowler university of texas at austin austin, tx icar report 105.
Workability slump test is used to determine the workability of fresh concrete. Summary of concrete workability test methods eric p. A slump test can be used to measure the workability of concrete. Compaction factor test for concrete test for workability.
Chapter 1 components of concrete concrete is made up of two components, aggregates and paste. Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. Modern concrete production systems have not eliminated the need to monitor concrete workability in the field. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. One test which measures the consistency of concrete is the slump test. May 18, 2018 this video animation, animated video explains the procedure for determination of workability by compaction factor test. It is not a suitable method for very wet or very dry concrete. The slump values were recorded and interpreted for obtaining response of varying concrete to the workability and consistency of the mix. The compression test shows the best possible strength concrete can reach in perfect conditions. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. The simple pullout test was recommended as an alternative test to compacting factor, slump and vb consistometer tests in measuring. See chapter 3 concrete testing workability is affected by.
The concrete slump test measures the consistency of fresh concrete before it sets. The compacting factor test is performed to find out 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. Move the glass disc attached to the swivel arm and place it just on top of the. It does not measure the workability of concrete but it is very useful in. If the slump test result is outside of the slump range, correct before placing th e concrete in the work. A workability test for slip formed concrete pavements. Materials natural coarse aggregate and siliceous fine aggregate with maximum size of 38 in. Workability means the ease with which concrete can be moved and placed in forms without segregation. Properties of highworkability concrete with recycled concrete aggregate by testing o100. 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. Compaction factor test of concrete for low workability. Consistency of concrete is another way of expressing workability but it is more confined to the parameters of water content. It consists of a vibrating table, a metal pot, a sheet of metal cone and a standard iron rod.
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. The summary of concrete workability test methods koehler and fowler, 2003 offers a good survey. Most concrete must be compacted after it has been placed in the. Properties of fresh concrete university of washington. Tests for workability of concrete at construction site and.
Strength and workability characteristics of concrete by. Testing for the workability of concrete engineering basic. To the contrary, the advent of new socalled highperformance concrete. Compaction factor test workability test of fresh concrete. Workability of concrete civil engineering community. The concrete workability is the property of freshly mixed concrete which determines homogeneity, placed, mixed, consolidated and finished as specified by aci standard 116r90 or aci 1990b.
Compacting factor test of concrete we civil engineers. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. Slump test of concrete learning technology youtube. Flow table test of concrete to test workability of concrete.
The test is popular due to the simplicity of apparatus used and simple procedure. Tyler ley, ashkan ghaeezadah oklahoma state university, oklahoma, united states highlights a novel workability test was developed for slip formed pavements. 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. 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 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. In the compaction factor test, a given volume of concrete undergoes free fall from one hopper to the second, and then into a cylindrical container see figure 4. Consistency and workability are often confused with one another. The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. Workability is a property of raw or fresh concrete mixture. Determination of workability test for concrete civil engineering animated videos, civil. Workability of concrete is mainly affected by consistency i. The cone is placed with the wide end down onto a level, nonabsorptive. 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.
Pdf effect of superplasticizer dosage on workability and. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. It is the amount of work required to place concrete and to compact it thoroughly workability of concrete increases with the addition of water but it reduces the strength and as such it is not a very desirable way of increasing the workability. Workability is a property of freshly mixed concrete, and a concrete is a mixture of ce.
Thus concrete of the same consistency may vary in workability. The coarse aggregate used in the experimental investigation is a mixture of 20mm and 10mm size aggregates. The concrete is struck even with the top of the cone, and the cone is carefully lifted away. 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. The compacting factor test has been developed at the road research laboratory in united kingdom. This test is in use in europe and by some state departments of transportation but does not currently have an astm test method developed. Tests for workability of concrete at construction site and recommended values various tests for workability of concrete at construction sites i. This method is suitable only for the concrete of high workability. Slump is normally measured by filling an abrams cone with a sample from a fresh batch of concrete. 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. The procedure was used to show gradation impacts on the workability of a concrete. The sample of concrete is placed in the upper hopper upto. Workability is a complex property of concrete which directly impacts on concrete strength, quality and appearance and it also determines how easily freshly made concrete can be mixed, placed, compacted and finished with the minimum to no loss concerning homogeneity. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows.
We hope this blog post on concrete workability and its related test methods has been helpful. A sheet metal cone, open at both ends a standard iron rod. This test is carried out with a mould called slump cone whose top diameter is 10 cm, bottom diameter is 20 cm and height is 30 cm. Slump test suitability this method is suitable only for the concrete of high 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. Obtain samples for strength tests by the same procedure as for slump or air test. Summary of concrete workability test methods the university of. Tests for workability of concrete at construction site and its values.
Summary of concrete workability test methods request pdf. Chapter 9 standard test procedures tests on concrete may 2001 page 9. Workability of concrete workability is an important property of concrete in its stage. Aggregates foundation for technology, research, and education. Slump test compaction factor test veebee consistometer test 1. Two other common workability tests are the compaction factor test and the flow table test. The water content was adjusted to compensate for the dry gravel and sand used in the lab. The kistner concrete mix achieved a high slump of nearly 9 inches, using a water cement ratio wc of 0.
Standard slump and flow table tests columbia university. It is more precise and sensitive than the slump test and is particularly useful for concrete mixes of very low workability and normally used when concrete is to be compacted by vibration. The slump test is done to make sure a concrete mix is workable. Slump test is used to measure consistency of fresh concrete mix.
Slump test doesnt give accurate results for the low workability of concrete when the slump is test used for concrete mixes of very low workability. Strength and workability characteristics of concrete by using different super plasticizers. Workability measures how easy the concrete is to place, handle and compact. Apparatus used for workability test of concrete a vibrator table resting on elastic supports a metal pot.
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