二级界面对水泥基材料孔结构和性能的影响

将粉煤灰、硅灰和纳米纤维材料--活性NR粉应用于水泥基材料中，依据最大密实度理论和微粒级配数学模型设计出水泥基材料，研究了水泥基材料中二级界面对其性能的影响．结果表明，加入活性NR粉纳米纤维矿物可改善体系的颗粒级配和水泥基材料中二级界面的显微结构，提高均匀性，降低孔隙率，优化体系的孔结构．改善二级界面的显微结构可降低体系的总比孔容，提高球形孔隙体积率，降低体系的最可几孔径，优化硬化浆体的孔结构以及提高体系的内部拉应力，提高水泥基材料的抗弯强度．

Effect of secondary interface microstructure on pore structure and performance of cement-based materials

Fly ash, silica fume and nano-fiber materials-active NR powder were employed to incorporate into the cement-based materials. The cement-based materials were designed on the basis of maximum density theory and the grain grading mathematical model, and the effect of secondary interface microstructure on the performance of the cement-based materials was studied. The results show that the additions of active NR powder and nano-fiber mineral can improve the particle grade of the system and the microstructure of secondary interface in the cement-based materials can increase uniformity, reduce porosity and optimize pore structure of the system. Improving secondary interface microstructure can reduce total specific intrusion volume, increase volume ratio of spherical pore and most probable diameter of the system, optimize pore structure of the hardened mortar, increase interior tension stress of the system and greatly increase flexure strength of hardened mortar.