Workability of fresh concrete by compacting factor test. Calculation the compaction factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete. Previous pg print table of contents next pg summary of concrete workability test methods eric p. Aggregates foundation for technology, research, and. Compaction factor test slump cone test does not give good results in case of stiff or harsh concrete. Water is an important ingredient of concrete as it actually participates in the chemical reaction with cement. The compaction factor test gives the behavior of fresh concrete under the action of external force. Reliability of rebound hammer test in concrete compressive. A number in parentheses indicates the year of last. Following tables shows the degree of concrete workability based on the results of slump tests and compacting factor tests.
Workability of concrete is better determined by compaction factor test. In this test the amount of compaction obtained by spending a known amount of energy is measured. 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. To determine the workability of fresh concrete of given proportions by slump test and compacting factor test. It shall normally to be stated to the nearest second decimal place. The compacting factor apparatus is used to determine the compaction factor of concrete with low, medium and high workability. Workability of a concrete signifies the full compaction of concrete using a required or reasonable amount of work which helps to achieve the desired possible density or void of fresh concrete resulting better strength and durable concrete structure and helpful to maintain.
Test on fresh concrete by compaction factor year 3. As the sand equivalent number increases it indicates less clay sized material in the sample. Apparatus consists of two hoppers each in the shape of frustum of a cone and one cylinder. Lbox test the lbox test is used to evaluate the fluidity of selfcompacting concrete and its ability to pass through steel bars. The first 3 factors do not affect the strength of the concrete in the structure, but cylinder test results do indicate lower strengths than the actual.
If you need to print pages from this book, we recommend downloading it as a pdf. Compaction factor test workability test of fresh concrete. 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. One of the recent methods of compacting very lean or dry concrete. Pdf effect of compaction on assessed concrete strength. A similar analysis to slump was carried out for compacting factor based on the standard compacting factor test results as shown in fig. The compacting factor test has been developed at the road research laboratory u. Coarseness workability consolidation a new approach. It was developed by road research laboratory in united kingdom. For flexural members such as beams and slabs, a strength of 0. Compaction of concrete method for compacting concrete.
Coarseness workability consolidation a new approach daniel cook, ashkanghaeezadeh, tyler ley, p. Slump test compaction factor test flow test vee bee test kelly ball test 4. Aashto tp 64, the rapid migration test rmt, operates under the same principle as the rcpt, but is designed to actually drive chloride ions into the concrete specimen so their depth of penetration can be measured. Inspect all materials used in the construction of concrete. Compaction factor test is the workability test for concrete conducted in laboratory. Tex424a, obtaining and testing drilled cores of concrete. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. This video animation, animated video explains the procedure for determination of concrete slump test. The results are applicable only to the specific concrete sample tested and may not be indicative of the strength or quality of other concrete placed on this date. The slump and compacting factor test values shown below are of concretes with 20mm or 40mm maximum size of aggregates. 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. Astm c1849 c1849m 17 standard test method for density.
Improper molding of the specimens may result in honeycombed sections in specimens. The compaction factor is the ratio of weights of partially compacted to fully compacted concrete. Basics of concrete materials and testing one day, 7. Concrete slump and compacting factor test values and uses.
Compaction factor test is classified into two sections viz. Place the concrete sample gently in the upper hopper to its brim using the hand scoop and level it. In this experimental investigation, the effect of compaction on concrete strength assessed by rebound hammer, ultrasonic pulse velocity, and pullout techniques as well as core test were examined. It was developed by road research laboratory in united kingdom and is used to determine the workability of concrete. W is the estimated consistency parameters which include slump, compacting factor and vebe time, corresponding to a given pcfamk concrete mix. Slump test gives an idea of only the flowing property of wet concrete and not of the workability. For this reason, it is applicable to concrete made with normaldensity or highdensity aggregate particles and requires determination of the aggregate correction factor described in test method c231c231m.
It uses super plasticisers and stabilizers to significantly increase the ease and rate of flow. Compaction factor testcore cutter testslump test of concretespecific gravity of cement testcompressive strength test of concrete cubes. Compaction factor test for concrete workability method. Chapter 12testing of cement part 1 page 61 a bed of cement is prepared in special permeability cell and have exact porosity e 0,500 weight a quantity of cement. But sometimes it is also specified by another test called compaction factor. Generally we specify workability of concrete in terms of its slump test value.
Slump test doesnt give accurate results for the low workability of concrete when the slump is workability of concrete. Workability of concrete compacting factor test nctel. We present the testing as neutron shielding material of a new highdensity concrete commercially available under the name hormirad, developed by the spanish company ctrad. Compressive strength of medium strength m30 grade self compacting concrete using. Fowler university of texas at austin austin, tx icar report 105. This has now been withdrawn and replaced by bs en 123504.
Potential products such as spun pipes are compacted by spinning process. The compaction factor test is used for concrete which have low workability for which slump test is not suitable. This test also gives the workability of concrete indirectly. Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. Hence we shall discuss with relevance to limit state design. It is more precise and sensitive than the slump test. The following checklist allows contractors and concrete producers to ensure that core strengths best represent the condition of the inplace concrete. The last 5 conditions affect the quality of the concrete in both the structure and in the specimens. 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. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Workability of concrete and compaction factor test. 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.
Slump test and compacting factor test of fresh concrete. Compaction factor test for concrete manufacturers, exporters and. Measuring the workability of high fines concrete sponsored by. Compressive strength of medium strength m30 grade self. The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. Summary of concrete workability test methods the university of. Compaction factor test, measurement of workability. Standard test method for compressive strength of cylindrical concrete specimens1 this standard is issued under the. The plastic concrete when at every high speed get well compacted by centrifugal force. Modifications to the permeability test proposed by aci522r, pervious concrete, were made to evaluate permeability of the specimens. Push the concrete sticking on its sides gently with the road. Slump test doesnt give accurate results for the low workability of concrete when the slump is compaction factor test used for concrete mixes of very low workability. Introduction to methodology the national academies press.
The compacting factor test is performed to find out the workability of concrete. Compaction factor test for concrete workability method and. Open the trapdoor at the bottom of the upper hopper so that concrete fall into the lower hopper. This test is more appropriate for the concrete mixes of very low workability that is commonly compacted through vibration. The compacting factor test has been developed at the road research laboratory in united kingdom. Tip 11 testing concrete cores the strength of cores is used to verify the quality and strength of concrete in structures. Test specimens have the same dimensions as used for the rcpt. The relation between slump and compaction factor is roughly as follows.
This standard covers the test method for slump flow of selfcompacting concrete with a maximum coarse aggregate size of 40 mm or less. The two tests, compacting factor and degree of compactability are quite different. Workability of concrete compacting factor test youtube. Selfcompacting concrete scc is a flowing concrete that does not require vibration and, indeed, should not be vibrated. Partially compacted concrete in fully compacted concrete, this is done with tamping the concrete. Compaction factor test is more efficient and precise in determining the workability as compared to slump test. States which use this test for portland cement concrete specify a minimum sand equivalent between 70 and 80. Limit state design is being predominantly used for design of rcc members.
Compacting factor apparatus, concrete testing equipment. Compacting factor test it is more precise and sensitive than the slump test and is particularly useful for concrete mixes of very low workability as are normally used when concrete is to be compacted by vibration. This test is appropriate for concrete with the maximum aggregate size of 40mm. The range of results of each these tests indicates the suitable uses of concrete work. Workability factor coarsness factor zonev, rocky zone i, gab graded zone iii. Scoop 1 theory this is a site test to determine the consistency or workability of concrete and is conducted in the lab. Comprising two conical hoppers having a hinged trap door attached to the lower end of each hopper, allowing the concrete sample to flow freely into the cylindrical mould. Most commonly, cores are extracted when there is a reported low strength test result of standard cured cylinders.
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