Aggregate impact value testing aiv test civil engineering. Apparatus the apparatus consists of an impact testing machine, a cylindrical measure, tamping rod, is sieve, balance, tamping rod and oven. Sample preparation table 1 test sample sizes for aggregate gradation test shall conform to the following table and. Dec 07, 2017 in this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. Just click on the names of the tests above to know the entire procedure of how we perform these tests. Pavement interactive was developed by the pavement tools consortium, a partnership between several state dots, the fhwa, and the university of washington, as part of their effort to further develop and use computerbased pavement tools. To carry out the aggregate impact test, the followings are the procedures use. Note 1 the aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. A test result is the average of at least two standardcured.
Dec 26, 2019 the aim of aggregate impact test is to determine the relative measure of the resistance of aggregate to sudden shock or impact in which in some aggregate differs from its resistance to a slowly applies compressive load. The following are the apparatus use during aggregate impact test. To find impact value of the given aggregate sample. Procedure of aggregate impact value test the test sample. An ssd condition is one in which the aggregate has no free water on the surface of the aggregate.
Dec 15, 2017 the aggregate impact value indicates a relative measure of the resistance of the aggregate to a sudden shock or impact which in some aggregates differs from its resistance to a slow compressive load. Aggregates can be dehydrated by warming them at temperatue of 100110 c for a. Accordingly, the relevant test methods may be chosen from amongst the various tests covered in this standard. This testing method is known as an aggregate crushing value test. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any sizereduction requirements including, advantages of aggregate impact value test, quarry, aggregate, and different kinds of minerals. This edition completely replacesy 201the 9 labofebruarratory manual of test procedures. Standard test method for determining potential resistance to. To determine the aggregate impact value of coarse aggregates as per is.
Aggregates may be dried by heating at 100110 c for a period of 4 hours and. Aiv test is conducted to determine the aggregate impact value of coarse aggregate. The impact machine shall rest with out wedging or packing upon the level plate, block or floor, so that it is rigid and the hammer guide columns are vertical. The test specimen includes the aggregates of size ranging from 10. Comparative study of established test methods for aggregate. This test provides a method for measuring this strength. For the convenience of the user, the test methods are grouped into the following eight parts of indian standard methods of test for aggregates for concrete is. When accurate determinations of material finer than the no. The test provides data needed to obtain that portio astm c 1a procedure for testing coarse aggregate larger than the average residual strength is computed for specified beam deflections beginning after the beam has been cracked in a.
Standard test methods for determination of the impact. Classification of aggregates using aggregate impact value is as given below. Generally, the test is conducted on aggregate passing 12. The particular purpose which an aggregate is meant to serve requires the aggregate to have a particular strength which is usually stated in the specification. A procedure for testing coarse aggregate smaller than astm c inchpound values given in parentheses are for information only. The sample used for this test shall be taken in accordance with chapter 2. Standard test methods for determination of the impact value. In this video, we will see the procedure of determining aggregate impact value as per is 2386. Determination of aggregate impact value impact test on. To measure the workability of concrete by compaction factor test apparatus required. Effect of basalt aggregates and plasticizer on the compressive. This manual has the current versions of our laboratory test procedures. The test sample shall consist of aggregates the whole of which passes through. The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from its resistance to a slow compressive load.
California test 201 soil and aggregate sample preparation. The evaluation of the conventional and the alternative tests. This test is done to determine the aggregate impact value of coarse aggregates. This test method determines the amount of material finer than the no.
Methods of test for aggregates for concrete, part 4. Rock aggregates laboratory test procedures s american society for testing and materials astm and american association of state highway and transportation officials aashto. Aggregate impact and crushing test linkedin slideshare. Balance a balance or scale of capacity not less than 3 kg, readable and accurate to o5 g and of such a type and shape as. From the calculations done we know that the aggregate can be acceptable as their aggregate impact value is less then 20% aggregate impact value 10. Pdf standard test method for resistance to degradation. Advantages of aggregate impact value test products. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Determination of aggregate impact value impact test on aggregates is done to carry out to. Accordingly, this manual directs attention to many of the factors that might affect the results of the tests. There are two test methods for determining the clay lumps and friable particles in aggregates. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
The aggregate comprising the test sample shall be dried in an oven for a period of four hours at a temperature of 100 to 110c and cooled. The test sample shall consist of clean aggregate which has been dried in an oven at 105 to 110c to substantially constant weight and shall conform to one of the gradings shown in table 1. The net weight of aggregate in the measure shall be determined to the nearest gram weight a and this weight shall be used for the duplicate test on the same material. Updates are made to the electronic file as needed and hard copies are uncontrolled. The following procedure is applied, to find out the impact value of aggregate. The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from its resistance to a slow compression load.
To complete the tamping procedure the test is tamped with 25 strokes. Aggregate impact value test apparatus, procedure and uses. The apparatus consists of a steel test mould with a falling hammer as shown in figure 1. The net weight of aggregate in the measure shall be determined to the nearest gram and this weight of aggregate shall be used the duplicate test on the same material. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. Unconfined freezethaw test for coarse aggregate mto ls614, 2. Laboratory tests for predicting coarse aggregate performance. Jan 12, 2017 the aggregate impact value is a calculation of the resistance to abrupt impact, bang or shock, which may vary from its resistance to steadily, applied compressive weight. This standard is issued under the fixed designation c 1. In this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. If the test sample dries past the ssd condition, immerse the sample in water for 30 minutes and resume the process of surfacedrying. Objective for determination of the aggregate impact value of coarse aggregate, which passes 12. When performing a test, some preliminary test information must be obtained by conducting a one. The test methods are similar, but there are differences, so always be sure to follow the correct method for the type of aggregate.
This degree is assessed by a sieving test on the impacted specimen and is taken as the aggregate impact value. Coarse aggregate crushing value is the percentage by weight of the crushed material obtained when test aggregates are subjected to a specified load under standardized conditions. This characteristic is measured by impact value test. Improper use of test procedures can result in inaccurate data and mistaken conclusions about aggregate and concrete quality. Procedure the test sample consists of aggregates passing 12. Aggregate crushing value test procedure and result. Aggregate crushing value provides the resistance of an aggregate sample to crushing under gradually applied compressive load. Pdf rock aggregate test procedure aaron chia yun zhen. Concrete cube test method or compressive strength test of concrete formula with procedure.
The aggregates should therefore have sufficient toughness to resist their disintegration due to impact. The aggregate impact test is carried out to evaluate the resistance to impact of aggregates. The crushed aggregate is remove and pass through size 2. The fractions passing through and retain is weigh on the sieve. Download scientific diagram test procedure for aggregate impact value. Then the trapdoor of the lower hopper is opened and. The sample is sieve through test sieves sizes of 14. Procedure a shall be used unless otherwise specified. The whole procedure is repeated using the second sample of the mass. It is supported on level and plane concrete floor of minimum 45 cm thickness. Determination of aggregate impact value impact test on aggregates. However, if a test was identical to an aashto, ast, or mftp procedure it was not m duplicated in this manual. The aim of aggregate impact test is to determine the relative measure of the resistance of aggregate to sudden shock or impact in which in some aggregate differs from its resistance to a slowly applies compressive load.
With aggre gate of aggregate crushing value 30 or higher, the. Procedure to determine aggregate impact value i the cup of the impact testing machine should be fixed firmly in position on the base of the machine and the whole of the test sample placed in it and compacted by 25 strokes of the tamping rod. The test sample shall consist of aggregate the whole of which passes a 12. The indian standard code is 2386 part iv 1963 is used for procedure and classification of aggregate by result. Sep 05, 2018 the net weight of aggregate in the measure shall be determined to the nearest gram and this weight of aggregate shall be used the duplicate test on the same material. Pdf impact testing of concrete the measurement device. Standard test method for compressive strength of cylindrical concrete specimens. The sample of concrete to be tested is placed in the upper hopper up to the brim. Aggregates for the test sample can be decided by passing it through 12.
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