Discussion
Method of curing of concrete recommended for rapid gain of strength of concrete is:
Answer: B
The method for rapid gain of strength is High-pressure steam curing.
In high-pressure steam curing (autoclaving), concrete products are cured in steam at around 175°C and 8 to 10 atmospheres. The high temperature speeds up hydration so much that concrete reaches in about a day the strength normal curing would give in 28 days, and it also improves resistance to sulphates and reduces shrinkage. It is used for precast products.
Sprinkling water and membrane curing only keep the concrete moist at ordinary temperature, so strength develops at the normal rate. Infrared radiation curing is a form of accelerated curing used in cold regions, but it is not the standard method recommended for rapid strength gain.
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