6, the wall and the ground Yin and yang angle of 90 degrees, the Yin and yang angle into a straight line, the ground requires flat pressure.7, check whether the ground shell, sand and protruding concave convex, cracks and other phenomena.
3, strength: not at the concrete strength standard C20 requirements.4, humidity: base moisture content of less than 3%.5, ambient humidity: indoor temperature and ground temperature to 15 degrees is appropriate. 5 degrees below and above 30 degrees can not be built environment. Indoor relative humidity should be maintained atBetween 20%-75%.
1, ground Flatness: requirements within 2 meters ruler flatness should be less than 2mm-3mm.2, hardness: base surface hardness of not less than 1.2 mpa.
Ground foundationFirst of all, to the construction site of the ground roughness, hardness, strength, humidity and humidity requirements
