Principle of the Test: The %age wear due to rubbing with steel balls is determined and is known as abrasion value. Prepare the sample by the portion of an aggregate sample retained on the mm (No. 12) sieve and place in a large rotating drum that contains a shelf plate attached to the outer wall.
This experiment will be achieved by varying the rubber aggregates from 5%, 10% and 15% by weight. A mix design of class 25 will first be prepared and then slump cone test will be carried out to determine the workability of the concrete. For the determination of Aggregate Crushing Value, the (812110, 1990) will be adopted to carry out the test.
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Aggregate Crushing Value Civil Engineering. AGGREGATE CRUSHING VALUE This test helps to determine the aggregate crushing value of coarse aggregates as per IS: 2386 (Part IV) 1963. The apparatus used is ...
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The aggregate impact value is calculated by the formula, Eq. (4). (4) Where: A is the weight of aggregate in the steel cup; B is the weight of crushed aggregate from steel cup passing through mm sieve. Aggregate Crushing Value Aggregate crushing value apparatus (AIM 455) confirming the requirement [13] is used for conducting this ...
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Summary. The shelf carries them around until they drop on the opposite side of the drum, subjecting the aggregate to impact and crushing. Then, the aggregate is subjected to abrasion and grinding as the drum continues to rotate until the shelf picks up the contents, and the process is repeated.
By using the moisture content and absorption of the aggregates, you can adjust the batch weights to account for the actual moisture condition. If the moisture content is higher than the aggregate's absorption value, the aggregates will contribute free water to the mix.