Appendix A-American Concrtete Institute, Fire Resistance of Concrete Building Units, Program of Tests-Revised to January 12, 1923
ACI Committee P-5
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In all of the tests, unless otherwise noted, the block tested is to be of the three oval core type, 8 x 8 x 16 in., to be of 1 : 5 mix, to be of a semi-dry mix having a consistency wet as possible, tamped with automatic tampers and to be hardended in the steam room. Except as otherwise sepecified, the aggregate is to be Elign (calcareous) sand and pebbles grading 0 to 3/8 in.