混凝土已问世一个多世民纪了。臻使它成为轻质、高强、多功能的材料,是人们长期研究所想达到的目标。近二十多年来,世界各国致力于研制蒸压硅酸盐混凝土及蒸压多孔混凝土,就是一个例证。在混凝土强度理论研究方面,根据混凝土密实度的基本概念,Feret建立了第一个关系式: Concrete has come out for many people. It makes it a lightweight, high-strength, multi-functional material that people long-term research aims to achieve. In the past two decades, all countries in the world have devoted themselves to the development of autoclaved silicate concrete and autoclaved porous concrete. This is an example. In the theoretical study of concrete strength, according to the basic concept of concrete density, Feret established the first relation: