The apparatus of the aggregate impact value test consists of: A testing machine weighing 45 to 60 kg and having a metal base with a plane lower surface of not less than 30 cm in diameter. Level and plane concrete floor of minimum 45 cm thickness are used to support it. The base of the machine should also have provisions for fixing its base.
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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. The Indian Standard CODE IS 2386 Part IV – 1963 is used for procedure and classifi ion of aggregate by result.
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One such test is the Aggregate Impact Value Test. The impact test is a type of quality control test for highway pavements and is used to check the suitability of aggregates to be used in the construction of highway pavements. The property by which the aggregates are capable of resisting the impact is known as toughness.
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AIM: To determine the aggregate impact value of coarse aggregates as per IS: 2386 Part IV - 1963. APPARATUS: i Impact testing machine conforming to IS: 2386 Part IV - 1963 ii IS Sieves of sizes - 12.5mm 10mm and 2.36mm iii A cylindrical metal measure
The apparatus used for determining aggregate impact value of coarse aggregates is Impact testing machine conforming to IS: 2386 Part IV - 1963IS 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.
Standards BS 812:112 The Aggregate Impact Value Testing Apparatus meets with BS 812 it is robustly designed 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 is the ratio of the weight of the fraction passing through 2.36 mm weight W2 by the total weight of the sample weight W1 W2 . Aggregate Impact Value = W2/ W1 W2 * 100 = 80 gm / 300 gm
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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. Resistance of the aggregates to impact is termed as toughness.
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Aggregate Impact Value Apparatus Impact hammer weight: 13.75kg± 0.05kg Height of the fall hammer: 380± 5mm Impact cup: 102× 50mm Test sieve: 15.0mm 10.0mm 2.50mm Circular section metal straight stick: 10× 230mm one part is Semicircle Gauge metal