The Structural Engineer > Archive > Volume 9 (1931) > Issues > Issue 1 > Proposed Standard Aggregate for Laboratory Tests of Concrete
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Proposed Standard Aggregate for Laboratory Tests of Concrete

STANDARD AGGREGATES. - The Standard aggregates shall be prepared from uncrushed Thames ballast. This consists of gravel and sand from the Thames Estuary and from lowlying land adjoining the river in the Thames Valley; it normally contains not more than 2 per cent. by weight of chert and 2 per cent. by weight of white veined quartz. It shall be free from shells, and shall be thoroughly washed and dried.