Requirements for concrete:
1. The strength is above C25 (at least above C20);
2. The water-cement ratio is not higher than 0.4;
3. The slump of concrete mixed on site should be no more than 5cm, and the slump of pumped concrete should be no more than 12cm;
4. For the secondary poured concrete floor, the thickness of the surface layer should not be less than 5cm;
5. In order to achieve better results, add steel mesh to the concrete;
6. The formed concrete can be divided into blocks and treated with polysilicon for an unlimited time. The cycle is short, the construction is flexible, and the ambient temperature is greater than 0 degrees, and the construction can be performed normally.
