Natural curing is carried out in the outdoor natural environment (natural temperature and humidity), but the concrete surface should be sprinkled with water or covered with moisturizing materials to prevent water from evaporating from the concrete surface.
Steam curing is to put concrete members in a steam curing room and introduce steam to raise the temperature of concrete, accelerate the hydration and hardening process of cement and auxiliary cementing materials, quickly reach the demoulding strength, and speed up the turnover of formwork and production efficiency.
Autoclaved curing is high-temperature and high-pressure curing, which needs to be carried out in an autoclave. The curing temperature is above 100℃, and products such as aerated concrete and lime-sand bricks need autoclaved curing, because silica raw materials such as quartz sand or quartz powder have no chemical activity at room temperature and can react with lime to generate calcium silicate under high-temperature and high-pressure conditions. At present, reactive powder concrete is often cured by autoclaving, which can achieve higher strength faster.