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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.
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- 51
- 52
- 24
- 15
Correct Option: A
| + | + | + Vw + Va = 1 | ||||
| ρc | ρs | ρa |
| ⇒ | + | |||
| 3.14 × 1000 | 2.67 × 1000 |
| + | + | + Va = 1 | ||
| 2.74 × 1000 | 1000 |
⇒ 0.117 + 0.227 + 0.421 + 0.184 + Va = 1
∴Va = 0.051 = 51 l/m3
