Answer / deepak

curing is required to reduce the heat of hydration and
concret get its 70% strength in 7 days,so minmum time
required is 7days if we do for 14,21,28 days also.

Answer / sharath

Actual chemicle process called hydration is going on upto 28 days,up to that period curing is required to prevent the evaporation or loss of water from concrete. In below 28days, concrete gaining some strength in the presence of hydration.after 28days chemicle process end and get full of it's strength. We can be use curing admixture in place of water curing..

Answer / guest

After concrete is placed, a satisfactory moisture content
and temperature (between 50°F and 75°F) must be maintained,
a process called curing. Adequate curing is vital to
quality concrete.

Curing has a strong influence on the properties of hardened
concrete such as durability, strength, watertightness,
abrasion resistance, volume stability, and resistance to
freezing and thawing and deicer salts. Exposed slab
surfaces are especially sensitive to curing. Surface
strength development can be reduced significantly when
curing is defective.

Curing the concrete aids the chemical reaction called
hydration. Most freshly mixed concrete contains
considerably more water than is required for complete
hydration of the cement; however, any appreciable loss of
water by evaporation or otherwise will delay or prevent
hydration. If temperatures are favorable, hydration is
relatively rapid the first few days after concrete is
placed; retaining water during this period is important.
Good curing means evaporation should be prevented or
reduced.

Answer / ramesh t.s

according to the hydration process in concrete the strength will be vary.if water content reduced in concrete, there hydration process will be slow. tats why the concrete is curing at 7 days interval.

Answer / mohd. asif zafar

Concrete is tested on 7th, 14th 21th or on 28th day in order to ensure that the day of testing is a working day. Suppose the cubes are casted on Monday, then the testing day i.e. 7th day after casting will again fall on Monday. Since on most of the places there is no work on Sunday, therefore no cube will be casted on Sunday and thus there will be no cube for testing on the next Sunday. Because of this this has become practice throughout the world to do testing on 7th, 14th, 21st or 28th day.. Lateron it was made standard for testing of concrete to perform testing after these days.

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