3 ·Let the weight of the aggregate be W1 = 5000 gram Weight of the aggregate sample retained W2 = 2100 gram Weight sample passing IS sieve = W1 W2 g = 2900 gram Abrasion Value = W1 W2 / W1 X 100 = 2900/50000 X 100 = 58 Results Los Angeles Abrasion Value of Aggregate = 58 IS Recommended Los Angeles Abrasion Value of
·Impact Value should not be less than 45% for aggregates used for concrete other than wearing surface and 30% for concrete used in wearing surface Table below shows the classification of aggregate with respect to aggregate impact value and limits of aggregate impact value for different types of road construction suggested by Indian Road Congress
·AGGREGATE Type of Aggregate FINE AGGREGATE Aggregate most of which pass IS sieve and contains only so much coarser material as permitted ; Natural Sand Fine aggregate resulting from the natural disintegration of rock and which has been deposited by streams or glacial agencies ; Crushed Stone Sand Fine aggregate produced by
·According to IS 2386 Part IV 1963 for the Aggregate Impact Value the aggregates must pass through mm sieve and retain on 10 mm IS sieve It also gives details regarding the other tests also Important Points The permissible limits for
·Aggregate impact value = A X ]00 where C 11IOII weight of the fines formed and A = weight of the oven driedsample 6 REPORTING OF RESULTS The mean of the two results shall be reported as aggregate impact value wet ofthe tested material Continu d from /Hlg 1 Membm llI/Jftstnting SaRI S V SURYANARIANA Central Water &
·IS 2386 Part IV 1963 Apparatus The apparatus for the standard test shall consist of following a A 15 cm diameter open ended steel cylinder with plunger and base plate of the general form and dimensions shown in Fig 1
·Also the maximum permissible limit of aggregate impact value is 45 % for cement treated base layer materials as per the Indian standards Modified Proctor Compaction The compaction characteristics of non treated and cement treated specimens were investigated using the modified Proctor compaction tests in accordance with Indian standard IS
The apparatus shall consist of the following Impact testing machine of the general form shown in Fig ; Sieves The IS Sieves of sizes 10 and mm ; Measure A cylindrical metal measure tared to the nearest gram of sufficient rigidity to retain its form under rough usage and of the following internal dimensions
·This document describes a test method for determining the aggregate impact value AIV of aggregates which provides a measure of their resistance to sudden shock or impact The test involves compacting aggregate samples in a steel cup and subjecting them to 15 blows from a hammer The crushed material is then sieved and the percentage passing a
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