Concrete (Concrete), referred to as "concrete (tong)" : refers to the aggregate cemented into a whole by the cementing material engineering composite materials collectively. Generally speaking, the term concrete refers to the use of cement as a cementing material, sand, stone as aggregate; With water (can contain admixtures and admixtures) according to a certain proportion, the cement concrete obtained by mixing, also known as ordinary concrete, it is widely used in civil engineering.