Transcription of Aggregates for Concrete - Memphis
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Aggregates for Concrete - Memphis
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.)
Characteristic Significance Test designation* Requirement or item reported. Resistance to abrasion Index of aggregate quality; ASTM C 131 (AASHTO T 96) Maximum percentage of and degradation wear resistance of floors and ASTM C 535 weight loss. Depth of wear pavements ASTM C 779 and time
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