Building Construction Handbook, Eighth Edition

shape, surface texture and grading (distributionshape, surface texture and grading (distribution

of particle sizes) are factors which influenceof particle sizes) are factors which influence

the workability and strength of a concretethe workability and strength of a concrete

mix. Fine aggregates are generally regarded asmix. Fine aggregates are generally regarded as

those materials which pass through a those materials which pass through a 4mm sievemm sieve

whereas coarse aggregates are retained on awhereas coarse aggregates are retained on a

4 mm sieve. Dense aggregates have a density ofmm sieve. Dense aggregates have a density of

more than 120more than 1200 kg/m^3 for coarse aggregates andfor coarse aggregates and

more than 125more than 1250 kg/m^3 for fine aggregates. Thesefor fine aggregates. These

are detailed in BS EN 12620: Aggregates forare detailed in BS EN 12620: Aggregates for

concrete. Lightweight aggregates include clinker;concrete. Lightweight aggregates include clinker;

foamed or expanded blastfurance slag and exfoliatedfoamed or expanded blastfurance slag and exfoliated

and expanded materials such as vermiculite, perlite,and expanded materials such as vermiculite, perlite,

clay and sintered pulverizedclay and sintered pulverized–fuel ash to BS EN 13055-1.fuel ash to BS EN 13055-1.

Aggregates ~Aggregates ~

coarsecoarse

aggregateaggregate

4mm sieve

fine

aggregateaggregate

Concrete Production---Materials