【摘要】 采用纳米压痕技术对比分析未改性和改性石英岩粉与水泥浆体的微界面力学性能,研究未改性与改性石英岩粉对水泥浆体和水泥砂浆强度的影响。结果表明:石英岩粉经过表面改性后,石英岩粉与水泥浆体微界面处的弹性模量和硬度得到了显著提高,这主要是因为改性石英岩粉表层的β-C₂S水化生成了C-S-H凝胶,改善了石英岩粉与水泥浆体的微界面结构,从而提高了微界面粘结力。微界面力学性能的增强可以显著提高水泥浆体和水泥砂浆的宏观强度。更多还原

【Abstract】 Mechanical properties of micro-interface between unmodified or modified quartzite powder and cement paste were analyzed by comparison with nanoindentation technique.Meanwhile,the strengths of the blended cement pastes and mortars containing unmodified or modified quartzite powder were also investigated.The results show that through the surface modification of quartzite powder,the nanoindentation modulus and hardness of the micro-interfacial zone between quartzite powder and cement paste are improved.This can be attributed to the formation of calcium silicate hydrate gel owing to the hydration of the β-C₂S contained in the modified quartzite powder,and hence enhancement of the interface microstructure and adhesion between the quartzite powder and cement paste.At macrolevel,the improvement of mechanical properties of micro-interface between quartzite powder and cement paste can improve the strengths of cement paste and mortars considerably.更多还原