The maintenance of mass concrete is mainly to maintain suitable temperature and humidity conditions;

First, try to reduce the hydration heat of cement and postpone the peak time of heat release.

1, adding fly ash to replace part of cement, and because of the slow hydration reaction of fly ash, the appearance time of exothermic peak can be delayed;

2. Admixtures can reduce the dosage of cement and water and delay the appearance of exothermic peak;

3. During construction in summer, measures such as mixing with ice water, shading in sand and gravel yard, spraying cold water all the way through the concrete conveying pipeline, etc. are adopted to reduce the temperature of concrete leaving the machine and entering the mold.

Second, keep warm and moisturize.

1, the curing time should not be less than 14d, so that the temperature difference stress generated in the process of concrete hardening is less than the tensile strength of concrete itself, thus avoiding harmful cracks in concrete.

Third, concrete is poured in layers and sections.

1, layered vibrating compaction makes the hydration heat of concrete dissipate as soon as possible;

2, also can use the method of secondary vibration, increase the compactness of concrete, improve the crack resistance, make the upper and lower two layers of concrete before the initial setting.

Fourth, do a good job of temperature measurement.

1, control the temperature change in concrete at any time, and timely adjust the heat preservation and maintenance measures, so that the difference between the central temperature and the surface temperature of concrete, and the difference between the surface temperature of concrete and the atmospheric temperature does not exceed 25 degrees.