复合微粒高性能混凝土的二级界面显微结构及耐久性研究

将天然纳米纤维材料及活性球形掺合料复合应用于高性能混凝土中,用以改善高性能混凝土的二级界面,探讨胶凝材料的颗粒紧密堆积及显微结构。对混凝土力学性能的研究表明:改善混凝土的二级界面,可以大幅度提高其抗弯强度和弹性模量;对耐久性的研究表明,由于加入了纳米纤维材料,改善了体系颗粒级配及二级界面显微结构,增加了体系密实度,是提高混凝土抗冻性、抗渗性的有效途径。因而,研究高性能混凝土的二级界面显微结构,对于提高高性能混凝土的宏观物理力学性能及耐久性存在巨大潜能。

RESEARCH ON PROPERTIES AND SECONDARY INTERFACE MICROSTRUCTURE OF HIGH PERFORMANCE CONCRETE

In order to improve secondary interfaces of concrete and to get the maximum packing density, nano-fiber materials and spherical pozzolantic mineral admixture such as silica fume, fly ash in an optimal proportion were incorporated into high performance concrete. Here, the second-level interface is all other interfaces apart from interfaces between coarse aggregate and mortar. Mechanical properties, durability and second-level interface microstructure were determined. The experimental results show that the bending strength and modulus of elasticity of concrete increase greatly and the resistance to freeze - thaw and im-permeability of concrete are improved obviously.