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Sampling of Aggregates

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The fine and coarse aggregates storing at the stockpile or batching plant should be periodically sampled for sieve analysis , ie the Grading Test , before bringing up to the overhead hoppers for batching purpose . When the aggregates are delivered to the stockpile on site , it usually causes segregation during unloading , no matter by conveyor belt beside the waterfront or end tipping by lorry .

Segregation means the fine material leaving at the top while the coarse material rolls down to the toe of stockpile . Thus , sampling should be conducted at different levels within the middle half of the stockpile and avoid sampling material at the top and bottom parts . The sample will be divided by using a riffle box to obtain a specimen for testing .

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