An excess amount of entrapped air held within the concrete bya high percentage of material passing the 600 Âµm, 300 Âµm,and 150 Âµm (No. 30, 50, and 100) sieves, resulting in asticky or tacky concrete that can become more easilysealed when floating or finishing it at any early age.void placing a slab directly on polyethylene film or other vapor barriers. Use a 100-mm (4-in.) layer of compactible, drainable fill (not sand). A âcrusher runâ material, usually graded from 38 mm to 50 mm (1-1/2 in. to 2 in.) down to rock dust, is suitable.
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