For the compacting factor test, the top hopper is filled with concrete. The compacting factor apparatus is used to determine the compaction factor of concrete with low, medium and high workability. Workmanship variables included different lengths of moist curing, incomplete compaction and intentionally induced flaws. The concrete should be filled to the brim of the hopper and level it of with trowel. Standard test method for compressive strength of cylindrical.
Check tip of source rod to assure it is free of any foreign substance i. The pressing easiness of a dry concrete is closely related to its mix design and the mobility of its particles in a confined volume defined by the geometry of the product. Workability of concrete and compaction factor test. This test is appropriate for concrete with the maximum aggregate size of 40mm. Test for workability of concrete slump cone youtube. In this test the amount of compaction obtained by spending a known amount of energy is measured.
The concrete cube test result will be satisfactory but the concrete in the structure would have a much lower strength. Pdf effect of compaction on assessed concrete strength. Lbox test the lbox test is used to evaluate the fluidity of selfcompacting concrete and its ability to pass through steel bars. The compaction factor is known as the proportion of the mass of moderately compressed concrete to the mass of completely compacted concrete. 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. Slump test and compacting factor test of fresh concrete. Soil compaction soil compaction is defined as the method of mechanically increasing the density of soil. Concrete slump and compacting factor test values and uses. It is not easy to measure the amount of work required to fully compact it. Selfcompacting concrete scc has been described as the most revolutionary development in concrete construction for several decades. This test is more appropriate for the concrete mixes of very low workability that is commonly compacted through vibration. Push the concrete sticking on its sides gently with the road. The compacting factor test has been developed at the road research laboratory in united kingdom. The cylinder and concrete weighed partially compacted weight.
Slump test doesnt give accurate results for the low workability of concrete when the slump is compaction factor test used for concrete. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. The concrete slump test is referred to in several testing and building code, with minor differences in the details of performing the test. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Compacting factor test is mainly used in laboratory to determine workability of concrete. 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. Slump test doesnt give accurate results for the low workability of concrete when the slump is compaction factor test is used for concrete which have low workability for which slump test is not suitable. Procedure to determine workability of fresh concrete by compacting factor test.
With the help of a trowel, fill the freshly prepared concrete in the top upper of the apparatus. Compaction of concrete method for compacting concrete. Harper formerly assistant research engineer william w. Apparatus consists of two hoppers each in the shape of frustum of a cone and one cylinder. Compacting factor apparatus, concrete testing equipment, controls. This has now been withdrawn and replaced by bs en 123504. Chapter 9 standard test procedures tests on concrete may 2001 page 9. Compacting factor weight of partially compacted concrete weight of fully compacted concrete veebee test. Compaction factor test it is more accurate than slump test for concrete mixes and value of compaction factor of 0. Originally developed to offset a growing shortage of skilled labour, it has proved beneficial economically because of a number of factors, including. Test on fresh concrete by compaction factor year 3 duration. This video animation, animated video explains the procedure for determination of workability by compaction factor test. The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. Procedure for concrete compression test concrete sample.
The specimen is conditioned in an environment at a standard. Compressive strength of concrete in flexure as determined. Summary of concrete workability test methods the university of. Compaction factor test is more efficient and precise in determining the workability as compared to slump test. Compressive strength of concrete cube test pdf, procedure, results. What is the maximum possible value of compacting factor for. In construction, this is a significant part of the building process. The number of tamping of strokes per layer varies with the type of concrete. The compaction factor test highlights the behaviour of fresh concrete under the operation of outer force. Manual of aggregate and concrete testing1 introduction this manual is intended to supplement, not in any way to supersede, the variousastm test methods for sampling and testing aggregate and freshly mixed and hardened portlandcement concrete.
The manual was prepared by committee c09 on concrete and concreteaggregates and has been accepted. Prepare the test site and proceed as stated in section 5. Dropped into a lower hopper to bring it to a standard state and then allowed to fall into a standard cylinder. Following tables shows the degree of concrete workability based on the results of slump tests and compacting factor tests. This new flow table test is covered with bs 1881 part 105 of. The range of results of each these tests indicates the suitable uses of concrete work. For example, the strength of concrete containing 10% of entrapped air may be as little as 50% that of the. The workability of concrete has also been defined as the amount of work required to place the concrete and to compact it thoroughly. In this matter, factors such as the flow capacity of the system into the mold, or friction between the particles. A similar analysis to slump was carried out for compacting factor based on the standard compacting factor test results as shown in fig. It is limited to concrete having a unit weight in excess of 50 lbft 3800 kgm. Workability of concrete is better determined by compaction factor test. This weight is known as weight of fully compacted concrete.
The slump and compacting factor test values shown below are of concretes with 20mm or 40mm maximum size of aggregates. Investigations on some properties of nofines concrete. In this test, the compaction achieved through a free fall of concrete determines its workability. Test beams proportioned to meet these conditions have ajlways feilad in tension in the reinforcement with a factor of safety between 2. For such types of concrete mixes, it is hard to measure the workability by slump test. The compression test shows the best possible strength concrete can achieve in perfect conditions. However, tests on beams with sufficient reinforcement to develop. To determine the workability of concrete mix by finding the compaction factor test.
Astm c42c42m is the standard test method for obtaining and testing the strength of drilled cores and sawed beams of concrete. Compaction factor test for concrete workability method and. 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. It is one of the physical parameters of concrete which affects the finesse. 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. Compaction factor test, measurement of workability. Research paper relation between workability and compressive.
Here, lies the importance of compaction factor test. Place the concrete sample gently in the upper hopper to its brim using the hand scoop and level it. Assessment of concrete strength in existing structures using. Concrete permeability was measured on cores according to astm c 1202, standard test method for electrical indication of concretes ability to resist chloride ion penetration. This is another test to identify the workability of concrete.
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. Other tests evaluating consistency are the british compacting factor test, the vebe. As there are two methods to find the flow value of concrete which one is outdated. Compaction of concrete is, therefore, a twostage process figure 1. Astm c1849 c1849m 17 standard test method for density and. It is not suitable for concrete of very low workability of 0.
It should usually be affirmed to the nearby second decimal place. Compaction factor test civil engineering lab experiment. The deflection flexural strength test was carried out to evaluate the strength of the concrete beam mini beam sample and find the failure load of the mini beam 100mm by 100mm by 500mm. Testing concrete in structures nondestructive testing determination of rebound number. In situ strength can be estimated using a basic relationship with a deter mined factor for shifting the basic relationship curve to take into account of the specific concrete and production. Since compaction of concrete is designed to expel entrapped air and optimise the density of the concrete, it benefits most of the properties of hardened concrete. Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. Workability of fresh concrete by compacting factor test.
In this experiment the slump test and the compacting factor test were used to assess the workability and uniformity of concrete. The upv technique is generally used in accordance with the standard test method for pulse velocity through concrete astm c59716 and the american concrete institute standard aci 228. The desired values of slumps for various works have been shown in table 3. Cube test results judges proper concreting at site. The compacting factor test is performed to find out the workability of concrete. The concrete slump test measures the consistency of fresh concrete before it sets. One of the recent methods of compacting very lean or dry concrete. Compaction factor test of concrete for low workability. Workability, slump and compacting factor of concrete with 19 or 38 mm 34 or 1 1 2 in maximum size of aggregate. Seay supervising field engineer research report 902f research study number 266590 sponsored by. Figure 1 measuring cylinder figure 2 mechanical weighing machine figure 3 plywood board figure 4 compacting factor apparatus figure 5 trowel figure 6 shovel.
Vee bee test is used to determine the consistency of concrete. Objective the workability of fresh concrete is a composite property, which includes the diverse requirements of stability, mobility, compactability, placeability and finishability. Compaction factor apparatus consists of trowels, hand scoop 15. If performed improperly, settlement of the soil could occur and result in unnecessary maintenance costs or. The compaction factor of concrete with low, medium and high workability can be determined by using the utc0580 compacting factor apparatus. It is important to recognise the two stages in the compaction process because, with vibration. Compacting factor article about compacting factor by the. The compression test measures concrete strength in the hardened state. Therefore, direct tensile test is not standardized and rarely used modulus of rupture test and splitting test are commonly used. The compaction of concrete by hand is done by using a standard tamping bar. Partially compacted concrete in fully compacted concrete, this is done with tamping the concrete.
Effect of concrete materials on permeability of concrete. Standard test method for measurement of rate of absorption of. But it is simpler to apply a standard amount of work to the concrete and to measure its degree of. Compaction factor test workability of concrete the. To determine the workability of fresh concrete of given proportions by slump test and compacting factor test. This test also gives the workability of concrete indirectly. The standard proctor test astm d698 employs 12,400 ftlbsft. The concrete is fully compacted, extra concrete added and then concrete and cylinder weighed again fully compacted weight. Compacting factor test lab report building materials. It is difficult to test concrete in direct uniaxial tension because of the problem of gripping the specimen satisfactorily and because there must be no eccentricity of the applied load. Scoop 1 theory this is a site test to determine the consistency or workability of concrete and is conducted in the lab.
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. 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. Compaction factor test civil engineering materials. The apparatus consists of two conical hoppers that both have a hinged trap door attached to the lower end. The standard rebound hammer provides a simple, easy and inexpensive method to estimate concrete strength properties. The concrete compacted by rollers can be called as roller concrete. Inspect all materials used in the construction of concrete. Methods of compaction of concreteconcrete technology. Slump test gives an idea of only the flowing property of wet concrete and not of the workability. Cores are extracted from hardened inplace concrete primarily to measure inplace concrete strength. Summary of concrete workability test methods research report icar 1051publications information table of contents sponsored by the aggregates foundation for technology, research and education 2. However, the results of the test on concrete are affected by various factors such. If necessary, modify sampling procedures to fit a specific situation.
Evaluation the compressive strength in concrete structures. 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. Compressive strength of concrete cube test provides an idea about all the characteristics of concrete. Open the trapdoor at the bottom of the upper hopper so that concrete fall into the lower hopper. First the aggregate particles are set in motion and slump to fill the form giving a level top surface. Combined use of nondestructive tests for assessment of. 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. This allows the concrete sample to flow freely into the cylindrical mould. Methods for measuring workability of concrete slump. Specimens are prepared from concrete taken from different construction sites.
Flow table test of concrete also determines the quality of concrete concerning its consistency, cohesiveness and the proneness to segregation. Concrete ingredients when mixed have considerable amount of entrapped air depending on the workability. As may be seen from fig2, its effect on compressive strength is dramatic. Investigations on some properties of nofines concrete t abadjieva and p sephiri department of civil engineering university of botswana private bag 0061 gaborone, botswana abstract nofines concrete is a form of lightweight porous concrete, obtained by eliminating the sand from the normal concrete mix. 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. Workability of concrete civil engineering community. Here we are explaining the new method of flow table test. Summary of concrete workability test linkedin slideshare. The decrease in the height of the concrete is called slump. W is the estimated consistency parameters which include slump, compacting factor and vebe time, corresponding to a given pcfamk concrete mix. Field concrete samples are prepared, cured and tested according to astm standard procedures. Vee bee testdefinition and procedure workability of.
The compaction factor test is used for concrete which have low workability for which slump test is not suitable. By using standard tamping bar, we can distribute the concrete in a uniform manner along the crosssection of the mould. 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. Perform correlation tests several times throughout the day.
Information from the concrete mix designs was then used along with the aggregate gradations. The ease with which one can use concrete is called workability. Compaction factor test for concrete workability method. The investigations aimed at developing a method of combined use of both the non destructive tests for assessment of strength of concrete with greater accuracy.
Pdf destructive and nondestructive testing of concrete. Key words concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity 18. Under this test, the workability of concrete is found with the compaction acquired through a free fall of concrete. Compaction factor test of concrete the compacting factor test is performed to find out the workability of concrete. Potential products such as spun pipes are compacted by spinning process.
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. Compaction factor test is classified into two sections viz. High workable mixes have lesser entrapped air than low workable mixes. Workability of concrete compacting factor test duration. Concrete compacting factor test free download as powerpoint presentation. The correction factors developed between the 2 sampling locations may vary due to changing conditions such as air and concrete temperature changes, pumping distances, etc.
The plastic concrete when at every high speed get well compacted by centrifugal force. It is more precise and sensitive than the slump test. Compaction factor test of concrete in hindi youtube. Compacting factor apparatus, concrete testing equipment. Veebee test is a good laboratory test suitable for stiff concrete mixes having low and very low workability. Flow table test of concrete to test workability of concrete. The two tests, compacting factor and degree of compactability are quite different. The test determines the consistency of concrete using a veebee consistometer this is achieved by measuring the time required for transforming by vibration, a concrete specimen in the shape of conical frustum into a cylinder. Compaction factor test workability test of fresh concrete. There are different methods for measuring the workability. Compaction factor test of concrete for low workability concrete.