Ncompacting factor test of concrete pdf

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. This standard covers the test method for slump flow of self compacting concrete with a maximum coarse aggregate size of 40 mm or less. 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 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. Concrete mix proportions for a given need can be optimized. It is more precise and sensitive than the slump test. 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. Compaction factor test, measurement of workability. For such types of concrete mixes, it is hard to measure the workability by slump test. This has now been withdrawn and replaced by bs en 123504. Astm c1849 c1849m 17 standard test method for density and. The most common cause for steel passivity disruption in florida highway structures is the presence of chloride ions in the concrete next to the reinforcing steel.

Compacting factor test lee chun yee 0321748 yee algel 0315890 yong boon xiong 0321754 gan jet foong 0315998 khoo xin yee 0316180 hi i pai ling 0320598 2. Errors in estimated transmission of photons can exceed a factor of three, depending on barrier thickness, if attenuation in highdensity concrete is simply scaled from that of normal density concrete. Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. The test results are compared within the framework provided by the desirability functions. It was named portland cement because it looked like the. Compaction factor test of concrete in hindi youtube. 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.

For the compacting factor test, the top hopper is filled with concrete. This delay in placing concrete is extremely important when the test is on the first load of concrete of the day. The term concrete refers to a mixture of aggregates, usually sand. Workability of concrete compacting factor test youtube. Chapter 4 concrete tex424a, obtaining and testing drilled cores of concrete manual of testing procedures 4 0899 0500 note 2. Slump test and compacting factor test of fresh concrete. Compaction factor test workability of concrete the. The compacting factor test has been developed at the road research laboratory in united kingdom. 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. 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. To determine the workability of fresh concrete of given proportions by slump test and compacting factor test. Apparatus consists of two hoppers each in the shape of frustum of a cone and one cylinder. W is the estimated consistency parameters which include slump, compacting factor and vebe time, corresponding to a given pcfamk concrete mix. 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.

Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. Concrete slump and compacting factor test values and uses. The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. This test also gives the workability of concrete indirectly. Compaction factor test of concrete for low workability concrete. Compaction factor test it is more accurate than slump test for concrete mixes and value of compaction factor of 0. The weight w 2 of the concrete in the cylinder is found out. Properties of concrete and concretemaking materials. Cores are extracted from hardened inplace concrete primarily to measure inplace concrete strength.

In very simple words, compressive strength is calculated by dividing the failure load with the area of application of load, usually after 28 days of curing. In order to provide proper freezethaw resistance, the national ready mix concrete association nrmca suggests achieving an air content of 48% with a minimum spacing factor of 0. As the sand equivalent number increases it indicates less clay sized material in the sample. Key words concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity 18. Compaction of concrete method for compacting concrete.

A strength test result is the average of two test cylinders made from the same sample of fresh concrete and tested at 28 days. Compaction factor test for concrete workability method. The plastic concrete when at every high speed get well compacted by centrifugal force. Cores can also be extracted from concrete pavements and structures to verify compliance. States which use this test for portland cement concrete specify a minimum sand equivalent between 70 and 80. Materials natural coarse aggregate and siliceous fine aggregate with maximum size of 38 in. Compacting factor apparatus, concrete testing equipment, controls. Slump test doesnt give accurate results for the low workability of concrete when the slump is workability of concrete. Compaction factor test workability test of fresh concrete. The two tests, compacting factor and degree of compactability are quite different.

This test is more appropriate for the concrete mixes of very low workability that is commonly compacted through vibration. Introduction to concrete portland cement association. 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. In this test, the compaction achieved through a free fall of concrete determines its workability. May 06, 2016 in this test, the compaction achieved through a free fall of concrete determines its workability.

Tex424a, obtaining and testing drilled cores of concrete. The last 5 conditions affect the quality of the concrete in both the structure and in the specimens. Compaction factor test workability of 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. This comprehensive concrete manual has both the triedandtested methods and materials, and more recent innovations. Compaction factor test is more efficient and precise in determining the workability as compared to slump test. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Compaction factor test for concrete workability method and.

It covers everything you need to know about concrete along with styrofoam forming systems, fiber reinforcing adjuncts, and some architectural innovations, like architectural foam elements, that can help you offer more in the jobs you bid on. The compaction factor is known as the proportion of the mass of moderately compressed concrete to the mass of completely compacted concrete. The compacting factor test is performed to find out the workability of concrete. A similar analysis to slump was carried out for compacting factor based on the standard compacting factor test results as shown in fig. Concrete mix proportions for a given need can be optimized using coarseness factor, mortar factor, and aggregate particle distribution concrete mixture optimization concrete mixture optimizationinvolves the adaptation of available resources to meet varying engineering criteria, construction operations, and economic needs. Compacting factor article about compacting factor by the.

The strength of concrete is controlled by the proportioning of cement, coarse and fine aggregates, water, and various admixtures. It is not suitable for concrete of very low workability of 0. Basics of concrete materials and testing one day, 7. The compacting factor test has been developed at the road research laboratory u. Sep 04, 20 all about workability of concrete, slump test, vee bee test and compaction factor test duration. 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. 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. Lbox test the lbox test is used to evaluate the fluidity of selfcompacting concrete and its ability to pass through steel bars. Potential products such as spun pipes are compacted by spinning process. Coarseness workability consolidation a new approach.

Astm c1849 c1849m 17 standard test method for density. Compacting factor apparatus, concrete testing equipment. Pdf testing of a new highdensity concrete as neutron. Introduction to methodology guidelines for concrete. 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. 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. The compacting factor apparatus is used to determine the compaction factor of concrete with low, medium and high workability. The maximum possible value of compacting factor for fresh green concrete is considered to be 1 theoretically, but lets look into it in a pragmatic way. The ratio of the water to cement is the chief factor for. Pdf effect of compaction on assessed concrete strength. 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. This standard covers the test method for slump flow of selfcompacting concrete with a maximum coarse aggregate size of 40 mm or less. Astm c42c42m is the standard test method for obtaining and testing the strength of drilled cores and sawed beams of concrete.

Under con tinuous favorable conditions, concrete continues to gain strength indefinitely. Any surplus concrete from the cylinder is removed in the manner explained before. The ratio of the two weights w 1 w 2 is known as the compaction factor. The performance is modeled for each factor and these models are used to identify the best predicted concrete bpc. Inspect all materials used in the construction of concrete work at their source, on the job, or both. Workability of concrete and compaction factor test.

Properties of concrete while cement in one form or another has been around for centuries, the type we use was invented in 1824 in britain. Procedure to determine workability of fresh concrete by compacting factor test. It is limited to concrete having a unit weight in excess of 50 lbft 3800 kgm. Compaction factor apparatus consists of trowels, hand scoop 15. Limit state design is being predominantly used for design of rcc members. Improper molding of the specimens may result in honeycombed sections in specimens. Nevertheless, the authors hope that this paper could lead to a fuller understanding of the significance of the tests and what the test results are really telling us. All about workability of concrete, slump test, vee bee test and compaction factor test duration. Inspect all materials used in the construction of concrete. Properties of concrete concrete is an artificial conglomerate stone made essentially of portland cement, water, and aggregates. Compaction factor test of concrete for low workability.

What is the maximum possible value of compacting factor. The best tested concrete btc is selected based on the overall desirabilities calcu lated for each mixture. What is the maximum possible value of compacting factor for. Convenient time for discharging the concrete cement from the upper hopper has been established to be approximately two minutes after the conclusion of blending. Concrete compacting factor test free download as powerpoint presentation. This test is appropriate for concrete with the maximum aggregate size of 40mm. When it can be determined that the length of the concrete core is not deficient more than 5 mm 0. Compacting factor test is an experiment that determines the consistency of freshly mixed concrete. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. The compaction factor test is used for concrete which have low workability for which slump test is not suitable. About four tons of concrete are produced per person per year worldwide and about 1. However, the first factors to be considered are the desired compressive strength and slump since.

For flexural members such as beams and slabs, a strength of 0. Slump test doesnt give accurate results for the low workability of concrete when the slump is factor test is used for concrete which have low workability for which slump test is not suitable. The range of results of each these tests indicates the suitable uses of concrete work. One of the recent methods of compacting very lean or dry concrete.

The slump and compacting factor test values shown below are of concretes with 20mm or 40mm maximum size of aggregates. Workability of fresh concrete by compacting factor 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. Summary of concrete workability test methods the university of. Hence we shall discuss with relevance to limit state design. Following tables shows the degree of concrete workability based on the results of slump tests and compacting factor tests.

1445 1454 1057 1272 922 832 221 300 1110 327 1160 644 613 971 48 1347 1041 486 288 1150 1216 496 21 842 152 744 112 327 968 516 804 37 333 985 554 633 420 1247 1137 283 229 1060 1469 416 1008 1489 410 834 1024