Even with the increase in knowledge of concrete rheology, the slump test remains the predominately used test method for measuring concrete workability. The strength of concrete is the most important property for us. Throughout australia, boral has established concrete testing laboratories staffed by qualified and experienced. Strength of concrete workability of concrete workability of concrete is the property of freshly mixed concrete which determines the ease and homogeneity with which it. Lai research fellow, department of civil and structural engineering, hk polyu. Procedure to determine workability of fresh concrete by slump test. Test procedure aashtq t 161 this test is used as an indicator of the amount of clay size material in the in the fine aggregate. Tip 11 testing concrete cores the strength of cores is used to verify the quality and strength of concrete in structures. Determination of workability test for concrete civil engineering animated videos, civil. Summary of concrete workability test methods research report icar 1051publications information table of contents sponsored by the aggregates foundation for technology, research and education. These constant cha nges are the principal causes of the ultimate failure or deterioration of the concrete.
Slump test suitability this method is suitable only for the concrete of high workability. 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 presence of cracks,voids and other imperfections, 3. Workability of concrete factors affecting workability of. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. For laboratory use the table is availablein two alternative model.
R0030 manual of aggregate and concrete testing this is not an astm standard. Coarseness workability consolidation a new approach daniel cook, ashkanghaeezadeh, tyler ley, p. Properties of fresh concrete university of washington. High workability, high durability concrete in the middle. The quality of one element of concrete in relation to another, and 6. Concrete dust released by building demolition and natural disasters can be a major source of dangerous air pollution. Specification for moulds for use in tests of cement and concrete. 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. Thus concrete of the same consistency may vary in workability. Changes in the structure of the concrete which may occur with time, 4. Standard deviation for compressive strength of concrete with example pdf. 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 design. Testing fresh concrete in the field concrete construction.
Workability of concrete types and effects on concrete strength. Archived portland cement concrete testing manual fhwa. Workers who cut, grind or polish concrete are at risk of inhaling airborne silica, which can lead to silicosis. Fineness test of cement and its significance tests on cement.
Workability of concrete is measured in terms of the ease of mixing and placing of concrete. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Despite their inherent limitations, singlepoint workability tests continue to be used for the specification and quality control of concrete. Workability is a property of freshly mixed concrete, and a concrete is a mixture of ce.
Typical measurement of the slump of a concrete which leads to inaccuracy because of round tamping bar. The apparatus used for doing slump test are slump cone and tamping rod. Slump test compaction factor test veebee consistometer test 1. One test which measures the consistency of concrete is the slump test. Astm c 31 covers making, curing, protecting, and transporting concrete test specimens under field conditions. Pdf workability analysis of steel fiber reinforced. Most concrete must be compacted after it has been placed in the. 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. The last 5 conditions affect the quality of the concrete in both the structure and in the specimens.
Concrete slump test procedure applications, types, uses. This is done by placing cement paste and spreading smoothly on the whole area of the specimen. High workability, high durability concrete in the middle east. Flow table test of concrete also determines the quality of concrete concerning its consistency, cohesiveness and the proneness to segregation. Concrete is a contributor to the urban heat island effect, though less so than asphalt. 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. If you need to print pages from this book, we recommend downloading it as a pdf. Determining the consistency of concrete as 1012, part 3 the slump test. Workability of concrete civil engineering community. The compacting factor test has been developed at the road research laboratory in united kingdom. This video animation, animated video explains the procedure for determination of workability of concrete by flow table test. Modern concrete production systems have not eliminated the need to monitor concrete. Astm r0030 manual of aggregate and concrete testing.
This test can be used as a control test and gives an indication of the concrete uniformity from batch to batch. These quality tests on concrete give an idea about the properties of concrete such as strength, durability, air content, permeability etc. Flow table test of concrete to test workability of concrete. Experimental study of strength relationship of concrete. 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. What are different tests for concrete quality check. Highly workable concrete can easily be mixed, placed and transported. As the name suggests, in this test the workability of concrete is determined by examining the flowing property of concrete. Guidebook on nondestructive testing of concrete structures.
Tests for workability of concrete at construction site and recommended values various tests for workability of concrete at construction sites i. The test can thus be conducted horizontally on vertical surfaces or vertically upwards or downwards on horizontal surfaces. Concrete slump test for workability procedure and results. Strength and workability characteristics of concrete by using. Fresh concrete must have a workability as compaction to maximum density is possible with a reasonable amount of work. Follow procedures given in astm c 172 to ensure the sample is truly representative of the freshly mixed concrete being tested. Compression test is the most common test conducted on the hardened concrete because it is an easy test to perform and most of the desirable characteristic properties of concrete are. Factors affecting workability of concrete civil engineering. High workability, high durability concrete in the middle east a case study. High workability, high durability concrete in the middle east a case study daniel brown maunsell consultants asia ltd. Introduction to methodology the national academies press. Under con tinuous favorable conditions, concrete continues to gain strength indefinitely. 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 slump test astm c 143 measures concrete consistency, or the ability of fresh concrete to flow. To investigate the paste consistency of cement plus pfa. Additional information on workability and quality of concrete can be obtained by observing the manner in which concrete slumps. Workability of concrete is mainly affected by consistency i. 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. As the sand equivalent number increases it indicates less clay sized material in the sample. The other options include ssd, ie staurated surface dry which means as wet as it can be by soaking in cold water, boiled which is one step further and vacuum saturated. Vibrating tables consist of vibrating motor, command unit and clamping assembly. Astm r0030 manual of aggregate and concrete testing this. These specimens are tested by compression testing machine. Pdf workability is one of the physical parameters of concrete which. The following checklist allows contractors and concrete producers to ensure that core strengths best represent the condition of the inplace concrete. Experimental study of strength relationship of concrete cube and concrete.
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. Consistency of concrete is another way of expressing workability but it is more confined to the parameters of water content. Flow table test for concrete test for workability of. For investigating low standardcured test results, aci 318 design. Typical measurement of the slump of a concrete which. Slump test is the most widely used method to determine workability of concrete mix in the lab or at the site. This test is simple to perform and requires a simple apparatus. The quality of the concrete in relation to standard requirements, 5. This is a good laboratory test to measure indirectly the workability of concrete. Pdf impact testing of concrete the measurement device. Compaction factor test workability of concrete the. Factors affecting workability of concrete a concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation.
This test consists of a vibrating table, a metal pot, a sheet metal cone, a standard iron rod. Pdf predicting the workability of fresh concrete using simple. States which use this test for portland cement concrete specify a minimum sand equivalent between 70 and 80. But it is not suitable for very wet or very dry concrete. Various tests for workability of concrete at construction sites i. There are several ways how to test impact resistance of concrete and various groups throughout the world developed. Guidelines for concrete mixtures containing supplementary cementitious materials to enhance durability of bridge decks is designed to help facilitate the use of supplementary cementitious materials to enhance durability of concrete used in highway construction, especially bridge decks. This objective then can be divided into more small objectives by dividing it into the experiment that will be done which are. Nondestructive testing of concrete methods of test. Slump test, measurement of workability, assignment help.
Tests on fresh concrete slump test vee bee test compaction factor test nisarg mistry. Tex424a, obtaining and testing drilled cores of concrete. To investigate the paste setting time of cement plus pfa. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction. The coarse aggregate used in the experimental investigation is a mixture of 20mm and 10mm size aggregates. May 20, 2018 this video animation, animated video explains the procedure for determination of workability of concrete by flow table test. The first 3 f actors do not affect the strength of the concrete in the structure, but cylinder test results do indicate lower strengths than the actual structure. May 15, 2018 this video animation, animated video explains the procedure for determination of concrete slump test. Workability of concrete types and effects on concrete.
Nondestructive evaluation and accreditation of diagnostic. Slump test is preferred for medium workability concrete mix and is not suitable for very wet or very dry concrete mixes. Unworkable concrete need more work or effort to be compacted in place, also. Trbs national cooperative highway research program nchrp report 566. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. The compressive strength is calculated from the failure load divided by the crosssectional area. Most commonly, cores are extracted when there is a reported low strength test result of standard cured cylinders. Major changes in the test procedures and testing machine. Workability analysis of steel fiber reinforced concrete using slump and vebe test article pdf available november 2015 with 9 reads how we measure reads. Concrete slump test procedure applications, types, uses and. Obtain samples for strength tests by the same procedure as for slump or air test. Cure concrete properly for a minimum of three days in order to develop good durability.
Highly workable concrete6 factors affecting workability of concrete7 workability vs. This chapter describes modelling and experiments on the rheology of cement based materials. The development of stable, highworkability mixes with a collapsed slump has led to the use of the flow test, more popular in europe, and. Each item in the checklist is based on astm c 4204, standard test method for obtaining and testing. The slump test is done to make sure a concrete mix is workable. Mix the concrete at agitating speed for all revolutions over 150. Thorough mixing of the sample before the start of the test is absolutely essential. Vibrating tables concrete compaction utest material. It does not measure the workability of concrete but it is very useful in. Strength and workability characteristics of concrete by using different super plasticizers. This video animation, animated video explains the procedure for determination of concrete slump test. Tests for workability of concrete at construction site and. All the materials and processes involved in producing concrete affect the workability of concrete. Coarseness workability consolidation a new approach.
Properties of concrete workability, setting, bleeding. Compressive strength of concrete cube test pdf, procedure. The small table accepts 2, large table accepts 6 cube or cylinder moulds by using clamping assembly. The rheology of concrete is a difficult problem, as fluid cement paste is nonnewtonian by itself, and concrete has the added complication of many sand and rock inclusions. Nondestructive evaluation and accreditation of diagnostic tests on concrete scct annual concrete seminar 2012 18 april 2012 ir dr wallace w. It depends on density ratio or compaction and compaction depend on sufficient workability. 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. Strength and workability characteristics of concrete by. Pdf workability analysis of steel fiber reinforced concrete. Tests on concrete concrete slump test, compression test. Chapter 4 concrete tex424a, obtaining and testing drilled cores of concrete manual of testing procedures 5 0899 0500 test specimens continued moisture conditioning submerge the test specimens in lime saturated water at 23. Slump test is used to determine the workability of fresh concrete. Method of tests for strength of concrete iit kanpur.
Strictly, it is the amount of useful internal work necessary to produce 100% compaction. Apr 03, 2017 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. This delay in placing concrete is extremely important when the test is on the first load of concrete of the day. Improper molding of the specimens may result in honeycombed sections in specimens. The slump flow test for highworkability concrete sciencedirect. Compressive strength of concrete cube test pdf, procedure, results. It is not a suitable method for very wet or very dry concrete.727 1009 667 515 789 1233 1116 509 1382 806 900 1109 993 182 1531 1084 1668 1680 371 1633 895 1625 1245 945 4 551 231 772 732 475 1185 104 1116 958