The specimens cured in the standard curing room are cured in the standard curing room with the temperature of 20 2℃ and the relative humidity greater than 95%, or in the immobile Ca(OH)2 saturated solution with the temperature of 20 2℃.

Second, the same support.

Refers to the specimen sampled at the concrete pouring site and cured according to the curing conditions of the structural entities at the site. Under this condition, the compressive strength of the specimen can better reflect the concrete strength of the structural entity.

Generally speaking, the cumulative curing temperature is from the beginning of curing to the outdoor daily average temperature reaching 600 degrees/day. However, when the temperature in the construction area is special, the curing time shall be guaranteed to be no less than 14d and no more than 60d.

Third, drench water to raise.

Put cotton cloth with good water absorption around the concrete test mould. After the concrete is mixed, it is poured into the test mold with cotton cloth for molding, and the surface of the concrete is covered with water layer for curing. In this way, curing water can penetrate all exposed surfaces of concrete through cotton cloth with good water absorption. Plastic film is placed on the test mold to prevent moisture evaporation.

Fourth, immersive culture.

Refers to the specimen that is sampled at the concrete pouring site and watered and cured according to the curing condition of the structural entity at the site.

Standard specimens are used for the acceptance of concrete quality of each inspection lot, representing the strength of concrete of the inspection lot; Co-cultured specimens are used for the acceptance of concrete quality of sub-projects and represent the concrete strength of structural entities. The strength inspection of standard specimens is the first acceptance of concrete quality, and the strength inspection of ordinary specimens is the second spot check of concrete quality.

Standard curing refers to curing the test block in a standard curing room with a temperature of 20 2℃ and a relative humidity of more than 95%, or curing in an immobile Ca(OH)2 saturated solution with a temperature of 20 2℃.

Co-cultivation refers to the specimen sampled at the concrete pouring site and cured according to the curing conditions of the structural entities at the site. Under this condition, the compressive strength of the specimen can better reflect the concrete strength of the structural entity.