Ingredients of concrete
Concrete= cement + fine aggregate + coarse aggregate + water
Concrete is a mixture of cement, fine aggregate, coarse aggregate and water. The materials are mixed together in a proper ratio. After mixing the concrete poured into a lubricated mold. After one day the concrete gets harden and it is ready for curing. Next the concrete is allowed for curing for 28 days. In 28th day the concrete attains its maximum strength.
Cement is a mixing substance which is used to bind the material together. The ordinary Portland cement (opc) is used normally for the construction. There are many type of cement available the different type of cement are used according to the necessity.
The aggregate used in the concrete should be strong, hard, rubble, tough and no impurities should be present. The aggregate are used as fillers in the concrete. Without the aggregate the concrete cannot be full filled. There are two types of aggregate in concrete.
- Fine aggregate
- Coarse aggregate
The aggregate which passes through the 4.75mm sieve are called as the fine aggregate. The fine aggregate are naturally deposited river sand. The commonly used fine aggregate are sand and surki.
The aggregate which retains on the 4.75mm sieve are called coarse aggregate. The coarse aggregates are blasted rocks into small piece.
The water is most important substance for mixing all cement, fine aggregate, coarse aggregate. When the water is mixed with all these material the cement starts its reaction of hardening. The drinking standard water should be used for mixing. We should not use salt water or dirty water for mixing the concrete because it affect the concrete in many ways.
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