10 + THUMB RULES FOR CONCRETE MIX DESIGN
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%.