Jun 22, 2014 the aggregate impact value is expressed as the percentage of the fines formed w. Adjust the height of the hammer so that its lower face is. Determination of aggregate impact value impact test on aggregates is done to carry out to. M1 mass of the test specimen m2 mass of the test specimen passing 2. The counter fitted to the machine automatically records the number of blows delivered to the sample. Aggregate impact value test as per is 2386 partiv 1993. Methods of test for aggregates for concrete, part 4. Download scientific diagram test procedure for aggregate impact value. Apparatus the apparatus of the aggregate impact value test as per is.
The aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. Save page to pdf the page to pdf system has been restored. Laboratory tests for predicting coarse aggregate performance in ontario s. Impact and crushing value aggregate crushing value acv sets. The cup shall be fixed firmly in position on the base of the machine and the whole of the test sample will be placed in it and compacted by a single tamping of 25 strokes of the tamping rod.
Standard test methods for determination of the impact value. The test sample shall consist of aggregate the whole of which passes a 12. 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. Advantages of aggregate impact value test products. Adjust the height of the hammer so that its lower face is 380 mm plus or. Aggregate impact value to bs812112 impact test equipment. Jan 12, 2017 the aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. Uta0640 aggregate crushing value acv set o 75 mm bs.
How to determine aggregate crushing value aggregate crushing. The aggregate impact value indicates a relative measure of the resistance of. Note 1 the aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Uta0630 aggregate crushing value acv set o 150 mm bs. Before testing, the aggregate should be in surface dry condition. In this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. Aggregates may be dried by heating at 100 degree celsius to 110 degree celsius for a period of 4 hours and cooled. Two procedures are described, one in which the aggregate is tested in a dry condition, and the other in a soaked condition. 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 value of aggregate impact test should not be more than 45% by weight of aggregates, used for concrete other than wearing surface.
Sample of aggregate shall be dried in an oven for a period of 4 hours at a temperature of 100 to. The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock. Step by step procedure for abrasion resistance test of cement concrete. Dec 15, 2017 the aggregates should therefore have sufficient toughness to resist their disintegration due to impact. The aggregates must be in surface dry condition before testing. How to determine the aggregate crushing strength value in. Aggregate impact value aiv aiv is the percentage of fines produced from the aggregate sample subjecting it. 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. Determination of aggregate impact value impact test on. 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 find impact value of the given aggregate sample. For this reason assessment of strength of the aggregate is made by using a sample of bulk aggregate in a standardized manner. Aiv test is conducted to determine the aggregate impact value of coarse aggregate. The aggregate crushing value acv test set measures how resistant an aggregate is, when being crushed under a gradually applied compressive load.
Discussion chief advantage of aggregate impact test is that test. How to determine aggregate impact value aggregate impact test. Aggregate crushing value test determine aggregate crushing. This video animation, animated video explains how to determine aggregate impact value aggregate impact test. The crushed aggregate is remove and pass through size 2. The evaluation of the conventional and the alternative tests has been conducted using a suite of over 100 coarse aggregate. This method of test covers the procedure for determining the aggregate impact value of coarse aggregate. Effect of basalt aggregates and plasticizer on the compressive. For smaller size fractions, a recommended method is described in an appendix to this standard. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. How to find aggregate crushing value and its test procedure. Procedure the test sample consists of aggregates passing 12. The advantage of aggregate impact test is that test equipment and as a conclusion, we have determine the the test procedure are quite simple and it determines the resistance to aggregates impact value of aggregate by impact of stones simulating field condition. Methods for determination of aggregate impact value aiv.
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 aggregate impact value is expressed as the percentage of the fines formed w. The aggregates may be dried by heating at 100 oc 110 o c for not mor than 4 hours and cooled to room temperature before testing, if necessary. Aggregate crushing value test procedure and result. This test is done to determine the aggregate impact value of coarse aggregates. Determination of aggregate impact value impact test on aggregates.
The aggregate crushing value acv provides relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Grade of the aggregate minimum mass of test portion allin aggregate 40 mm max. 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 aggregates should therefore have sufficient toughness to resist their disintegration due to impact. 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 material for the standard test consists of aggregates sized 10. Due to traffic loads the road stone are subjected to the pounding action of impact and there is possibility of breaking into smaller pieces. The aggregate impact value is a measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied compressive load. Aggregate impact value to bs812112 aggregates impact. Objective abrasion test is carried out to test the hardness property of aggregates. This characteristic is measured by impact value test. An impact value 35% is permissible for the bituminous macadam. Generally, the test is conducted on aggregate passing 12. When a sample subjected to this test produces a color darker than. Toughness is the property of a material to resist impact. Unconfined freezethaw test for coarse aggregate mto ls614, 2. Aggregate impact value test apparatus, procedure and uses.
For determination of the aggregate impact value of coarse aggregate, which passes 12. Aggregate sizes larger than 14 mm are not appropriate to the aggregate impact value test. The aggregates should be oven dried, which can passes through 12. Dec 07, 2017 in this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. The following are the apparatus use during aggregate impact test.
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. To determine the aggregate impact value aiv of aggregates which provides a relative measure of the resistance of an aggregate to sudden shock or impact. Aggregate impact value test construction aggregate experiment. Aggregate impact value calculator, test on course and fine. Resistance of the aggregates to impact is termed as toughness. Apparatus the apparatus consists of an impacttesting machine, a cylindrical measure, tamping rod, is sieve, balance, tamping rod and oven. The fractions passing through and retain is weigh on the sieve. 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. With aggre gate of aggregate crushing value 30 or higher, the.
Test aggregates are filled up to about onethird full in the cylindrical measure and tamped 25 times with rounded end of the tamping rod. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Chapter 7 standard test procedures tests for aggregates and bricks may 2001 page 7. Just click on the names of the tests above to know the entire procedure of how we perform these tests. Aggregate impact value the value of aggregate impact test w1w2100. 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. The methods are applicable to aggregates passing at 14. Standard test methods for determination of the impact. One of the test in which concrete material can fail is due to crushing under compressive stress. The whole procedure is repeated using the second sample of the mass. 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. What is impact value test of aggregate learn civil.
The evaluation of the conventional and the alternative tests. Aggregate impact value testing aiv test civil engineering. This testing method is known as an aggregate crushing value test. Aggregate impact value test construction aggregate. The test sample consists of aggregate are of size passing through 12. Aggregate impact value test determines the aggregate impact value aiv of aggregates which provides a relative measure of the resistance of an aggregate to sudden shock or impact. You can achieve the dry condition of aggregate by placing aggregates in an oven for 4 hours at 100degree celcius. Aggregate crushing value provides the resistance of an aggregate sample to crushing under gradually applied compressive load. Apr 19, 2017 determination of aggregate impact value. Laboratory tests for predicting coarse aggregate performance. Steps by step procedure for impact value test of aggregate. Crushing value apparatus acv, aggregates testing equipment.