Answer / anupam nath

Chemical reaction of cement and water will gives strength
to concrete. As soon as concrete placed in its place and
normal weather condition, during day time water percentage
in concrete evaporate and to retain the water in concrete
for at least seven days, we used to cure the structure by
sprinkling water on it.Curing starts after 24 hrs of
pouring.

Answer / manoj p. v

when Portland cement is mixed with water a chemical reaction called hydration takes place. The extent to which this reaction is completed influences the strength and durability of the concrete. Freshly mixed concrete normally contains more water than is required for hydration of the cement; however, excessive loss of water by evaporation can delay or prevent adequate hydration. The surface is particularly susceptible to insufficient hydration because it dries first. If temperatures are favourable, hydration is relatively rapid the first few days after concrete is placed; however, it is important for water to be retained in the concrete during this period, that is, for evaporation to be prevented or substantially reduced.

Answer / padmanabhan

to prevent the reduction of volume/shrinkage of concrete..

Answer / vijay kumar

The curing period depends upon the type of cement used, mixture proportions, required strength, size and shape of member, ambient weather, future exposure conditions, and method of curing. Since all desirable properties are improved with curing, the period should be as long as practical. For most concrete structures, the curing period at temperatures above 5º C (40º F) should be a minimum of 7 days or until 70% of the specified compressive or flexural strength is attained. The period can be reduced to 3 days if high early strength concrete is used and the temperature is above 10º C (50º F)

Answer / adeel

to avoid cracks that are generated by heat of cement.

Answer / bethina sudheer

cement in the concrete attains strength with water

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