The following batch weights (cubic yard/ssd basis), selected using ACI 211.1, pr

Question

The following batch weights (cubic yard/ssd basis), selected using ACI 211.1, produced concrete with a unit weight of 142.9 lb/ft3, a slump of 2 in., and an air content of 4%.

Material Quantities

Cement: 552 lb/yd3

Water: 265 lb/yd3

F.A.: 1184 lb/yd3

C.A.: 1779 lb/yd3

AEA: 11 oz/yd3

Material Data

C.A.: 1 inch; Unit wt (dry) = 95 lb/ft3; absorption (ssd) = 3.4%; S.G.(ssd) = 2.56; FSM = 1%

F.A.: FM = 2.80; S.G. (ssd) = 2.64; FSM = 2%

The following batch weights (cubic yard/ssd basis), selected using ACI 211.1, produced concrete with a unit weight of 142.9 lb/ft3, a slump of 2 in., and an air content of 4%.

Material Quantities

Cement: 552 lb/yd3

Water: 265 lb/yd3

F.A.: 1184 lb/yd3

C.A.: 1779 lb/yd3

AEA: 11 oz/yd3

Material Data

C.A.: 1 inch; Unit wt (dry) = 95 lb/ft3; absorption (ssd) = 3.4%; S.G.(ssd) = 2.56; FSM = 1%

F.A.: FM = 2.80; S.G. (ssd) = 2.64; FSM = 2%

1. How much concrete was produced (yield)?
2. What were the actual mix proportions on a cubic yard basis?
3. What batch quantities (cubic yard/ssd basis) should be used to produce concrete with a 4 in. slump and 6% air?

Explanation / Answer

1.concrete yield produced was 3782lb/yd3

2. mix proportions based on cubic yards:1:2.19:3.19 per cubic yard

3. 1:1.74:6.22

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