What is aggregate impact value test?

What is aggregate impact value test?

The aggregate impact value is a determining measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied compressive load.

Why aggregate impact value test is done?

The aggregates should therefore have sufficient toughness to resist their disintegration due to impact. This characteristic is measured by impact value test. 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.

What are the advantages of aggregate impact test?

The advantages of aggregates impact value test are that the apparatus and procedure of the test are simple. With this test, we can obtain the resistance and impact of aggregates (stones) even in field condition. The test can be done in a short period whether it is at construction site.

How is aggregate impact value expressed?

Calculation The aggregate impact value is expressed as the percentage of the fines formed in terms of the totalweight of the sample. Results The mean of the two results is reported as the aggregate impact value of the specimen to the nearest whole number.

How to calculate aggregate impact value in B.S.?

Aggregate Impact Value Aggregate Impact Value. The test sample shall consist of aggregates the whole of which passes through ½ in B.S. test sieve and is retained on a 3/8 in B.S. test sieve.

What is the purpose of the impact value test?

The impact value test is hence used to determine the measure of the toughness of aggregates. The general test procedure of the aggregate impact value test is briefly described below. 1. To assess the suitability of the aggregate to be used in the highway pavement.

How are aggregates dried for an impact test?

The test sample consists of aggregates sized 10.0 mm 12.5 mm. Aggregates may be dried by heating at 100-110° C for a period of 4 hours and cooled. (i) Sieve the material through 12.5 mm and 10.0mm IS sieves.

How is aggregate impact value determined in dcc3113?

Classification of aggregates using Aggregate Impact Value is as given below: Aggregate Impact Value Classification  <20%.= Exceptionally Strong  10 – 20% .=Strong  20-30%. =Satisfactory for road surfacing  >35%.= Weak for road surfacing 5. 5 APPARATUS 1. Aggregate Impact Value Test Machine 2.