10 + Thumb Rules For Concrete Mix Design


For adding 4 liters of water in 1 cu.m freshly mixed concrete

1. The slump value will be increased by 25 mm.

2. The compressive strength of concrete will be decreased by 1.5 to 2.0 N/mm2

3. The shrinkage potential will be increased by 10%.


4. 1/4 bag of cement will be wasted.

If the temperature of freshly mixed concrete is increased by 1%, then

1. 4 liters of water per cu.m will give equal slump.

2. The air content will be decreased by 1%.

3. The compressive strength of concrete will be decreased by 1.0 to 1.5 N/mm2.

If the air content of freshly mixed concrete  is

1. Increased by 1% then the compressive strength will be decreased by 5 %.

2. Decreased by 1%, yield will be decreased by 0.03 cu.m per 1 cu.m.

3. Decreased by 1%, then the slump value will be decreased about 12.5 mm.

4. Decreased by 1%, then the durability of the concrete will be reduced by 10%.

Also Read – Concrete Mix Design: Design Mix & Nominal Mix Concrete.
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