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钢筋混凝土从19世纪中叶开始采用以来,至今仅有一百多年的历史,其发展极为迅速。钢筋混凝土结构系由水泥、砂、石子、水、掺合料及外加剂经混合形成的混凝土与钢筋组成的共同受力结构,其材料制造、计算理论及施工技术等方面都已经历了很大的发展并且还在继续向前发展。混凝土是现代工程结构的主要材料,我国每年混凝土用量约九亿立方米,钢筋用量约2000万吨。规模之大,耗资之巨居世界前列。
Since its introduction in the mid-19th century, reinforced concrete has a history of only one hundred years now and its development has been extremely rapid. Reinforced concrete structure by cement, sand, gravel, water, admixture and admixture formed by the mixture of concrete and reinforced the composition of the common force structure, the material manufacturing, calculation theory and construction technology has experienced a lot of Develop and continue to move forward. Concrete is the main material of modern engineering structure. The annual amount of concrete in our country is about 900 million cubic meters and the amount of steel bar is about 20 million tons. Large-scale, costly giant in the world.