Aggregate Impact Value Testing Machine

The apparatus of the aggregate impact value test consists of.

Aggregate impact value testing machine. The apparatus used for determining aggregate impact value of coarse aggregates is impact testing machine conforming to is. 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. Aggregate impact value w2 w1 w2 100 80 gm 300 gm 26 67 impact value where w1 weight of the fraction passing through 2 36 mm is sieve 220 gm w2 weight of sample retained on 2 36 mm is sieves. And 50mm depth a tamping rod of 10mm circular cross section and 230mm length rounded at one end and oven.

80 gm w1 w2 total weight of sample 220 80 300 gm result. How do you calculate the aggregate impact value. The property by which the aggregates are capable of resisting the impact is known as toughness. The aggregate impact value is.

Sieving should be done in a circular motion. The ratio of the weight passing 2 36mm sieve and weight of oven dried sample is aggregate impact value. This apparatus is used to determine aggregate impact value of coarse aggregate. After that sample should be sieved with 10 millimeters sieve and collect in a container.

Preparation of sample i the test sample should conform to the following grading. This test is performed to ensure the aggregate toughness which is used in road construction to work as a base layer sub base layer. The hammer of the tester fall freely from 380 mm height on coarse aggregate for 15 times 15 sec the crushed aggregate removed from the cup then sieved and weighed. The base of the machine should also have provisions for fixing its base.

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. The impact value is measured in the ratio between the sieved aggregate of 10mm 2 36mm aggregates. Aggregate impact value test machine take a sample of aggregate and sieve with the help of a 12 5 millimeter sieve and retain it into a 10 millimeter sieve. One such test is the aggregate impact value test.

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. Level and plane concrete floor of minimum 45 cm thickness are used to support it. Precautions to be taken. Let s start with the experiment to understand the concept better.