The composition of an air-entrained concrete is given below: Water: 184 kg/m2 Ordinary Portland Cement(OPC): 368 kg/m3 Sand: 606 kg/m3 Coarse aggregate: 1155 kg/m3 Assume the specific gravity of OPC, sand and coarse aggregate to be 3.14, 2.67 and 2.74, respectively. The air content is ______ litres/m3.

The composition of an air-entrained concrete is given below: Water: 18

1.	The composition of an air-entrained concrete is given below: Water: 184 kg/m2 Ordinary Portland Cement(OPC): 368 kg/m3 Sand: 606 kg/m3 Coarse aggregate: 1155 kg/m3 Assume the specific gravity of OPC, sand and coarse aggregate to be 3.14, 2.67 and 2.74, respectively. The air content is ______ litres/m3.
A.	51
B.	52
C.	24
D.	15
Answer» B. 52

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