Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 274
s. 5 cu. ft. of Portland cement. X cu. ft. of sand (3) 34 per cent voids. This resolves into an equationwherein the total cement (5 cu. ft.)minus the cement going to fill thesand voids (.34X), plus the sand (x)equals the gravel voids (10) plus l.jper cent (1.5). this reduces to .66 X = 6.5.X = 9.9.… … Using the void assumptions justnoted it will be seen that a 5 sackbatch gives a nominal mix of approx-imately 1:3:5, while a 6 sack batchmakes an approximate nominal mix of1:1.4:4.2. .Mixing—In the 2-yd. mixers the con-crete is mixed for a minimum of 2minutes, and in the 4-yd mixers thetime is 2Vi…
Architecture · Building · Construction industry · Engineering
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