10 + THUMB RULES FOR CONCRETE MIX DESIGN

10 + THUMB RULES FOR CONCRETE MIX DESIGN

   11:35 AM       feykhan

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TIPS 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 cum 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%.