冻结深井用C100高强高性能混凝土基本力学性能及机理研究

Research on basic mechanical properties and mechanism of C100 high strength and high performance concrete for frozen shaft

从混凝土拌合物和硬化混凝土2个方面研究了C100高强高性能混凝土的力学性能,采用XRD、SEM以及MIP等微观研究方法,分析了C100高强高性能混凝土与普通混凝土相比力学性能得到改善的微观机制。结果表明:矿物掺合料对C100混凝土的力学性能有较大影响,原因是掺合料与水泥水化产物发生了"二次水化"反应,增加了混凝土中C-S-H凝胶的含量;C100混凝土的泊松比为0.20～0.24,抗压弹性模量约为50 GPa,抗拉弹性模量约为110 GPa。

The mechanical properties of CI00 high strength and high performance concrete are researched in both aspects of concrete mixture and hardened concrete. Analysis is performed on improving mechanism of mechanical properties of C100 high strength and high performance concrete different to ordinary concrete by some microscopic methods of XRD,SEM and MIP. The re- sults showed that：Mixed minerals have great influence on the mechanical properties of C100 high strength and high performance concrete,because of the ＂Second hydration＂ between mixed minerals and hydrated cement,which increased the content of C-S-H gel. The Poisson ratio of C100 concrete is 0.20-0.24,the modulus of the elasticity in compression is about 50 GPa, and the ten- sional modulus of the elasticity is llOGPa or so.