Answer / mahendra mohan srivastava

Curing has a major influence on the properties of hardened
concrete such as durability, strength, water-tightness,
wear resistance, volume stability, and resistance to
freezing and thawing

Proper concrete curing for agricultural and residential
applications involves keeping newly placed concrete moist
and avoiding temperature extremes for at least three days.

A seven-day (or longer) curing time is recommended.

Begin the curing as soon as the concrete has hardened
sufficiently to avoid erosion or other damage to the freshly
finished surface.

This is usually within one to two hours after placement
and finishing.
Keep water on the concrete during the curing
period. These include

ponding or immersion,

spraying or fogging, and

saturated wet coverings.

Such methods provide some cooling through
evaporation, which is beneficial in hot weather.
Prevent the loss of the mixing water from
concrete by sealing the surface. Can be done by:

covering the concrete with impervious paper or
plastic sheets,

applying membrane-forming curing compounds

Answer / sajin

concrete setting is a chemical reaction called hydration,for hydration the presence of water is required.after the placing and finishing of concrete the water will start to become dry because of hydration and evaporation due to atmospheric temperature ,so we need to pour water on the surface of concrete and to cover the concrete with some rug or plastic sheet to reduce the water loss. the process of keeping the concrete wet until it set is called curing..

Answer / salim_rambo

21 days

I need Bhel engineertrainy test papers in civil engineering please send to email id - hisandy66@gmail.com

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