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Fine Aggregate Grading for Concrete

Published Tuesday, February 01, 2005

Recent discussion has focused on why ASTM Specification C 33 for concrete aggregate was changed in the 1930s to reduce the amount of intermediate sizes permitted in the fine aggregate grading. C 33 was first adopted in 1921 by ASTM Committee C-9 as a tentative standard. It had limits on only two sieves: 100% pass No. 4 and 30% maximum passing No. 50, and a maximum of 3% fines washed out by elutriation. In 1923 coarser material was allowed with 100% pass ⅜ inch and 85% pass No. 4. Also, the provision that “the fine aggregate shall be ...

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