Compacting factor apparatus, concrete testing equipment. In current scenario of construction industries due to demand in the construction. Proctor test astm d155791 the proctor, or modified proctor test, determines the maximum density of a soil needed for a specific job site. Concrete slump and compacting factor test values and uses.
Partially compacted concrete in fully compacted concrete, this is done with tamping the concrete. Its maximum answer is 1 but practically it is lesser than 1. The compaction factor is defined as the ratio of weight of partially compacted concrete to that of fully compacted concrete. If you combine the two factors you get a factor spikes compaction factor which will convert loose state volume to compacted volume of the material. Stockton airfield test track stockton airfield was the corps principal test site for evaluating pappy porters california bearing ratio cbr test to compare subgrade modulus with various wheel loads and repetitions, working with the california division of highways and the sacramento district of the corps of engineers under.
Measurement of the degree of compaction by the impedance. 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. You can use this factor to estimate the amount of material you need to bring in for a certain area that needs to be. Compaction factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete. Compaction factor moist earth 40 to 2520 very dry 0. Compacting factor test lab report building materials. 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. Slump test simplest and crudest test fill concrete into frustum of a steel cone in three layers hand tap concrete in each layer movement of the concrete lift cone up.
Compaction of concrete finishing of concrete workability definition the amount of useful internal work necessary to produce full compaction without occurrence of the known concrete problems. Loktest which uses 25mm diameter insert cast into concrete at depth of 25mm 2. Proper compaction results in concrete with an increased density which is stronger and more durable. See chapter 3 concrete testing strength and durability are affected by. Compaction of the subsoil affects a range of soil functions and ecosystem services. It was developed by road research laboratory in united kingdom and is used to determine the workability of concrete. Tests on concrete workability tests slump cone test, compaction factor test.
The apparatus of compaction factor test is shown below. The swell and shrink factors are based on the material in its original state. Slump test doesnt give accurate results for the low workability of concrete when the slump is compaction factor test used for concrete. Compaction of concrete compaction of concrete is the process adopted for expelling the entrapped air from the concrete. The slump and compacting factor test values shown below are of concretes with 20mm or 40mm maximum size of aggregates. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. Testing of concrete compressive strength cube test duration. Measurement of workability of concrete by slump cone test 28. Measurement of the degree of compaction by the impedance method. Balance or other weighing device with a minimum capacity of 25 kg and accurate to. The compacting and finishing of concrete are generally two separate operations but sometimes, particularly with flat horizontal surfaces, they become parts of the one operation.
Compacting factor test is mainly used in laboratory to determine workability of concrete. The compaction factor is the ratio of weights of partially compacted to fully compacted concrete. The compaction of concrete by hand is done by using a standard tamping bar. Pdf effect of compaction on assessed concrete strength.
In a true slump, the concrete simply subsides and keeping. The slump test is done to make sure a concrete mix is workable. Degree of compactability 652017 31 properties of fresh. This method addresses roundingoff of numbers from test results and calculations. This test is performed to check the consistency of freshly made concrete. It is therefore important that the consistency of the mix is such that. By using standard tamping bar, we can distribute the concrete in a uniform manner along the crosssection of the mould. To determine the workability of fresh concrete of given proportions by slump test and compacting factor test. Compacting factor test is an experiment that determines the consistency of freshly mixed concrete. Workability of concrete is better determined by compaction factor test.
For questions involving significant figures and roundingoff of numbers, the policy for the region is defined below. 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. What are the effects of over compaction in concrete. Compaction factor test of concrete for low workability. Summary of concrete workability test methods research report icar 1051 sponsored by the aggregates foundation for technology, research and education. For the compacting factor test, the top hopper is filled with concrete. Push the concrete sticking on its sides gently with the road. Over the past decade, roller compacted concrete rcc has been successfully used on projects ranging in complexity from large dams to small building pads. A similar analysis to slump was carried out for compacting factor based on the standard compacting factor test results as shown in fig. 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.
In rocky fills the operator should always rotate the probe 90 degrees and take a second reading, recoding the lower of the two values. The field test of the compaction degree of the ground by means of the ordinary method is not repeated frequently enough to determine the overall compac tion quality of the ground because this method requires much time and cost. Compaction factor test is the workability test for concrete conducted in laboratory. We can place the concrete economically when compared to hand compaction. Sep 30, 2017 compaction factor test of concrete in hindi duration. Concrete workability, high performance concrete, slump, compacting. Appartus compaction factor apparatus platform scale100kg capacity and sensitivity10 grams hand scoop vibrating table procedure determine the. The compacting factor test has been developed at the road research laboratory in united kingdom. Compaction factor test is classified into two sections viz. Compacting factor, plain and reinforced concrete experiments, prc lab tests, civil. For the normal range of concrete the compaction factor lies between 0. Measures density of soil for comparing the degree of compaction vs specs. Slump cone is a vessel in the shape of a frustum of a cone with diameter at bottom 200. Compacting factor apparatus, concrete testing equipment, controls.
The useful internal work is the work or energy required to overcome the internal friction between the individual particles in the concrete. The driving force behind the compaction problem is the efforts of farming to remain economically viable in a. What is the maximum possible value of compacting factor for. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. In both types, a hand operated jack is used with a 55mm reaction ring and average of 6 readings used for correlation purpose. The report is divided into five sections covering 1 basic concepts, 2 performance relationships, 3 factors influencing compaction, 4 compaction control, and 5 specifications. 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. Compaction factor test is the workability test for concrete conducted in. But it is simpler to apply a standard amount of work to the concrete and to measure its degree of.
Slump test and compacting factor test of fresh concrete. May 06, 2016 compaction factor test slump cone test does not give good results in case of stiff or harsh concrete. Also explore the seminar topics paper on self compacting concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. Test on fresh concrete by compaction factor year 3. The forms can accommodate two different formats, metric and english. Scoop 1 theory this is a site test to determine the consistency or workability of concrete and is conducted in the lab. The compacting factor test has been developed at the road research laboratory u. Departments technical specifications volume 3 of 4 of the standard tender documents, it is necessary for. The test first determines the maximum density achievable for the materials and uses this figure as a reference. The potential strength and durability of concrete of a given mix proportion is very dependent on the degree of its compaction.
The two tests, compacting factor and degree of compactability are quite different. Summary of concrete workability test methods the university of. Regardless of the projects size or importance, field quality control is necessary. It is important to recognise the two stages in the compaction process because, with vibration. A measure of the ease by which fresh concrete can be placed and compacted. Factors affecting test results material parent batch of the sample wc, bleeding, segregation. Compaction factor test or compacting factor test determines the degree of compaction which is achieved by a standard amount of work done by allowing the concrete to fall through a standard height. At the top of the form is an area that allows the user to switch between the different units.
D1557 12 standard test methods for laboratory compaction characteristics of soil using modi. Open the trapdoor at the bottom of the upper hopper so that concrete fall into the lower hopper. Introduction compaction is the process which expels entrapped air from freshly placed concrete and packs the aggregate particles together so as to increase the density of concrete. Sep 11, 2017 slump test gives an idea of only the flowing property of wet concrete and not of the workability. Two other common workability tests are the compaction factor test and the flow table test. The test, known as the compacting factor test, is described in bs 1881103. The compaction factor test gives the behavior of fresh concrete under the action of external force. Following tables shows the degree of concrete workability based on the results of slump tests and compacting factor tests. It was named portland cement because it looked like the.
Arulsivanantham and gokulan 2017 define self compacting concrete as a new category of highperformance concrete that is characterized by its high workability, which ensures a high flow rate that. Lok test which uses 25mm diameter insert cast into concrete at depth of 25mm 2. 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. First of all we will understand the need of compaction of concrete. Compaction factor test to determine low workability of. Concrete compacting factor test free download as powerpoint presentation. In the united kingdom, the standards specify a slump cone height of 300 mm, a bottom diameter of 200 mm and a top diameter of 100 mm. The workability of concrete has also been defined as the amount of work required to place the concrete and to compact it thoroughly.
Compacting factor test of concrete we civil engineers. The test devices described in the patent documents listed in table 6 typically only. The concrete slump test is known as standard test method for slump of hydrauliccement concrete and carries the code astm c 143 or aashto t 119. Place the concrete sample gently in the upper hopper to its brim using the hand scoop and level it. In this test the amount of compaction obtained by spending a known amount of energy is measured. Compaction of concrete method for compacting concrete. Methods of compaction of concreteconcrete technology. 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.
The compacting factor apparatus is used to determine the compaction factor of concrete with low, medium and high workability. Properties of concrete concrete is an artificial conglomerate stone made essentially of portland cement, water, and aggregates. The degree of compaction, called the compacting factor is measured by the density ratio i. Interpretation of test results compressive strength of concrete. Introduction the importance of proper compaction of asphalt pavements has been recognized for many years. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. The use of vibrators may be essential for the production of good concrete. Workability of concrete and compaction factor test. 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. The measured slump must be within a set range, or tolerance, from the target slump. Compaction factor apparatus trowels, hand scoop 15. Compaction factor test for concrete workability method. This video animation, animated video explains the procedure for determination of workability by 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. The concrete laboratory intends to train the students in the field of testing. Workability of concrete is mainly affected by consistency i. The range of results of each these tests indicates the suitable uses of concrete work. To determine the workability of fresh concrete by compacting factor test as per is. What are the difference between tender and contract documents. Self compacting concrete seminar report, ppt, pdf for civil. Compacting factor article about compacting factor by the.
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. Compaction of concrete is, therefore, a twostage process figure 1. In most instances, the individual state specifications and test procedures will define the level of accuracy needed for the test results. The number of tamping of strokes per layer varies with the type of concrete. Nuc gages can have significant errors if the extendable probe is located next to a rock 3 inches across. Compaction factor test workability of concrete the. According to indian standard, is 11991959, the compacting factor is the ratio of the weight of partially compacted concrete to the weight of. Workability of concrete factors affecting workability of. Objective for determination of consistency of concrete where the nominal maximum size of aggregate does not exceed 38 mm using compacting factor test apparatus. The compaction factor test is to determine the workability of concrete. Compaction factor test workability test of fresh concrete. This has now been withdrawn and replaced by bs en 123504. Compaction factor test used to measure the degree of compaction for a given concrete mix.
Compaction is the process that expels entrapped air from freshly placed concrete and packs the aggregate particles together so as to increase the density of the concrete. The first 48 hours are very important for the performance of the concrete structure. With the help of a trowel, fill the freshly prepared concrete in the top upper of the apparatus. Compaction compaction is removing the air from concrete. The apparatus for the vebe test is shown in figure 3. Lab manual of concrete technology sanjay ghodawat group of.
Compaction is the process which expels entrapped air from freshly placed concrete and packs the aggregate particles together so as to increase the density of concrete. Conclusion slump test to determine the relative water content of concrete, depending on the loss in height slump of a sample obtained from a coneshaped mould. We get the results, and have a compaction factor of test discussion and conclusion. The report summarizes why compaction is important and how adequate compaction can be achieved. 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.
It is not easy to measure the amount of work required to fully compact it. First the aggregate particles are set in motion and slump to fill the form giving a level top surface. The following are some of the important tests conducted on concrete. Chapter 9 standard test procedures tests on concrete may 2001 page 9. W is the estimated consistency parameters which include slump, compacting factor and vebe time, corresponding to a given pcfamk concrete mix.
Slump test doesnt give accurate results for the low workability of concrete when the slump is of compaction of concrete and provides information on the techniques for undertaking the process on site. It is more precise and sensitive than the slump test. Capotest in which a steel ring is expanded into a groove undercut from an 18mm diameter drilled hole. 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. Compressive strength of concrete hardened concrete 1 g.
Tests on concrete concrete slump test, compression test for. The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. Conclusion slump test to determine the relative water. Def12the slump test results in various shapes, and according to the profile of slumped concrete, the slump are usually specified at true slump, shear slump or collapse slump. The degree of compaction is also called the compacting factor and is measured with the help of density ratio that is the ratio of density actually achieved in the test to the density of same concrete when it is fully compacted.
Veebee consistometer test, flow table test, strength tests compressive strength. This section includes a sample of each of the odot forms used for submitting samples and reporting test results. The compacting factor test is performed to find out the workability of concrete. In this test, the compaction achieved through a free fall of concrete determines its. The apparatus consists essentially of two hoppers, each in the shape of a frustum of a cone, and one cylinder, the three being above one another. Explore self compacting concrete with free download of seminar report and ppt in pdf and doc format.
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