Aggregates for Concrete

The importance of using the right type and quality ofaggregates cannot be overemphasized. The fine andcoarse Aggregates generally occupy 60% to 75% of theconcrete volume (70% to 85% by mass) and strongly influ-ence the Concrete s freshly mixed and hardened proper-ties, mixture proportions, and economy. Fine Aggregates (Fig. 5-1) generally consist of natural sand or crushedstone with most particles smaller than 5 mm ( in.).Coarse Aggregates (Fig. 5-2) consist of one or a com-CHAPTER 5 Aggregates for Concretebination of gravels or crushed stone with particlespredominantly larger than 5 mm ( in.) and generallybetween mm and mm (3 8in. and 11 2in.)

should be avoided; certain types of chert should be espe-cially avoided since they have low resistance to weather-ing and can cause surface defects such as popouts.

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  Surfaces, Concrete, Aggregate, Aggregates for concrete

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