Explain the need for curing of concrete ?
List the different methods that can be used for wet curing of concrete.For how long should curing be done?
Curing of concrete :-
The ultimate strength of concrete depends on the extent of hydration of cement complete hydration of cement requires adequate availability of water during the hydration reactions But due to evaporation and other reasons, water from concrete gets lost thereby making less water available for hydration of cement. The process of creation of an artificial environment with favorable conditions of temperature and humidity for setting and hardening of concrete by hydration of cement is called as curing.Different methods of curing:
1. Ponding water on concrete surface by constructing small clay bunds.
2. Covering concrete with wet saw dust or damp earth.
3. Covering the surface of concrete with water proof paper.
4. Sprinkling of water at regular intervals.
5. Covering concrete with wet jute bags.
6. Membrane curing of concrete by applying membrane forming compound n concrete surface.
7. Chemical curing like the use of sodium silicate which forms a thin varnish like film which also gets filled in the pores and surface voids.
8. Steam curing.
Curing period :-
The concrete gains most of its strength in 28 days and hence concrete should be cured for 28 days beyond which the rate of gain of strength is so small that it is not economical to further cure the concrete. IS 456 recommends a minimum of 7 days curing but IS 7861 recommends a minimum of 10 days curing in hot weather conditions.For highway pavements, curing period varies from 130to 30 days.
List the different methods that can be used for wet curing of concrete.For how long should curing be done?
Curing of concrete :-
The ultimate strength of concrete depends on the extent of hydration of cement complete hydration of cement requires adequate availability of water during the hydration reactions But due to evaporation and other reasons, water from concrete gets lost thereby making less water available for hydration of cement. The process of creation of an artificial environment with favorable conditions of temperature and humidity for setting and hardening of concrete by hydration of cement is called as curing.Different methods of curing:
1. Ponding water on concrete surface by constructing small clay bunds.
2. Covering concrete with wet saw dust or damp earth.
3. Covering the surface of concrete with water proof paper.
4. Sprinkling of water at regular intervals.
5. Covering concrete with wet jute bags.
6. Membrane curing of concrete by applying membrane forming compound n concrete surface.
7. Chemical curing like the use of sodium silicate which forms a thin varnish like film which also gets filled in the pores and surface voids.
8. Steam curing.
Curing period :-
The concrete gains most of its strength in 28 days and hence concrete should be cured for 28 days beyond which the rate of gain of strength is so small that it is not economical to further cure the concrete. IS 456 recommends a minimum of 7 days curing but IS 7861 recommends a minimum of 10 days curing in hot weather conditions.For highway pavements, curing period varies from 130to 30 days.
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