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Aggregate Impact Value

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AGGREGATE IMPACT VALUE
This test is done to determine the aggregate impact value of coarse aggregates as per IS: 2386 (Part IV) – 1963. The apparatus used for determining aggregate impact value of coarse aggregates is
Impact testing machine conforming to IS: 2386 (Part IV)- 1963,IS Sieves of sizes – 12.5mm, 10mm and 2.36mm, A cylindrical metal measure of 75mm dia. and 50mm depth, A tamping rod of 10mm circular cross section and 230mm length, rounded at one end and Oven.

Preparation of Sample
i) The test sample should conform to the following grading:
– Passing through 12.5mm IS Sieve – 100%
– Retention on 10mm IS Sieve – 100%

ii) The sample should be oven-dried for 4hrs. at a temperature of 100 to 110oC and cooled.

iii) The measure should be about one-third full with the prepared aggregates and tamped with 25 strokes of the tamping rod.

A further similar quantity of aggregates should be added and a further tamping of 25 strokes given. The measure should finally be filled to overflow, tamped 25 times and the surplus aggregates struck off, using a tamping rod as a straight edge. The net weight of the aggregates in the measure should be determined to the nearest gram (Weight ‘A’).

aggregate-impact-value

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.

ii) The hammer should be raised to 380mm above the upper surface of the aggregates in the cup and allowed to fall freely onto the aggregates. The test sample should be subjected to a total of 15 such blows, each being delivered at an interval of not less than one second.

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Reporting of Results
i) The sample should be removed and sieved through a 2.36mm IS Sieve. The fraction passing through should be weighed (Weight ‘B’). The fraction retained on the sieve should also be weighed (Weight ‘C’) and if the total weight (B+C) is less than the initial weight (A) by more than one gram, the result should be discarded and a fresh test done.

ii) The ratio of the weight of the fines formed to the total sample weight should be expressed as a percentage.

Aggregate impact value = (B/A) x 100%
iii) Two such tests should be carried out and the mean of the results should be reported.

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Comments
  • sadaf September 14, 2008 at 5:32 pm

    very informative

  • shafika October 13, 2009 at 6:59 am

    what is the important of impacts value toward pavement

  • nuraini October 13, 2009 at 7:22 am

    what is the important of aggregate impacts value toward pavement

  • ASIM QURESHI November 18, 2009 at 9:40 am

    HELPFUL KEY

  • rahmad November 22, 2009 at 5:52 am

    determine the best value of aggregate impact for good road pavement?

  • Mike (nigeria) December 9, 2009 at 7:31 pm

    Good sites for civil engineers. Precise and accurate and informative report on AIV test

  • Rajith Fernando January 2, 2010 at 1:46 am

    is 12.5 mm sieve acordingly BS or ASTM

  • okwu peter January 13, 2010 at 6:06 am

    i want this site to be the best site for civil engineers to access information

  • dipankar Pal January 30, 2010 at 9:57 am

    what is the Total load on the aggregates after stroking 15 times plz answer.

  • teemoney August 4, 2010 at 12:31 pm

    i want full documents covering aggregate impact value

  • sandeep August 6, 2010 at 2:48 am

    what is the test procedure for the stone polishing value test

  • Sumit August 11, 2010 at 2:33 am

    really significant..

  • prabhu October 21, 2010 at 10:13 am

    some examples should be given for clarification

  • mahmod December 2, 2010 at 5:35 am

    i want to know test result more and what is the diffrent between the value of this test

  • mehari December 18, 2010 at 2:42 am

    But what is the weight of the falling hammer ? . I guess it is important if we want to quantify the energy is applied on the aggregate sample.

  • Iqbal Mahmud February 26, 2011 at 12:02 pm

    The weight of the falling hammer is 13.4 to 14 kg.

  • khairul hasan March 3, 2011 at 5:25 am

    Thanks for these valuable information
    Please,tell something about “”THE USAGE OF AIV IN PAVEMENT DESIGN””

  • shola March 4, 2011 at 7:56 am

    what a nice report!

  • Plaban March 7, 2011 at 9:19 am

    plz say scops of the test………..

  • Abdullahi March 14, 2011 at 10:38 am

    Thanks for dis good report

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