1. The solidification of cement concrete is a complicated physical and chemical reaction process, and the hydration reaction process needs the support of water.
2. Watering curing is to replenish volatile water when concrete hardens, so that the cement in concrete can have enough water for hydration, reduce the hydration heat when concrete hardens, and reduce the cracks caused by rapid drying shrinkage of concrete surface.
3. Watering is one of the natural curing methods of concrete. Doing well the maintenance of fresh concrete is one of the important links to ensure the strength of concrete and prevent cracks.
4. After concrete is poured at room temperature 12 hours, it must be covered with heat preservation curing, and ordinary cement shall not be less than 7 days. If the water conservation of concrete is neglected, on the one hand, it will reduce the strength of concrete, on the other hand, it will be too late to replenish water during the hardening process of concrete, and a large number of cracks will occur due to lack of water. Watering and curing concrete can not only reduce cracks caused by temperature, but also reduce cracks caused by concrete shrinkage.
1, according to the different seasons and temperatures, the curing and molding period of cement is generally 28 days, but it is quite different in engineering practice. The specific curing period should be determined according to the structure type, section size, concrete grade, cement variety, temperature, humidity, evaporation, curing technology and other conditions.
2. In summer, the strength of ordinary cement will reach 15 days. In winter, sometimes the concrete pavement is in poor condition, and it is even difficult to achieve sufficient strength after two months of maintenance. But no matter what concrete, what curing conditions, we must ensure that the first 7 days of heat preservation and moisturizing curing. For structures with bad maintenance conditions, warm water can be used for maintenance.