Mineral filler materials , used in cement concrete ,m are known as aggregates . Sand , gravel , crushed rock and other mineral fillers are used as aggregates . In cement concrete volume occupied b aggregates is about 75 percent of the total volume of the concrete . Almost any material , provided it hs required strength , durability and sound , can be usd as an aggregates for making concrete .
According to the size , aggregates may be classified under two categories :
Coarse aggregates - It is the aggregates whose particles completely pass through 75 mm mesh sieve and are entirely retained on 4.75mm mesh sieve . Aggregates having its particles greater than 75mm is known as cyclopean aggregates .
Fine aggregate . It is the aggregates whose particles pass through 4.75 mm mesh sieve but are completely retained on 0.07 mm mesh . Particles finer than 0,06 mm come under silts and clays and are considered as harmful ingredients .
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