摘要: 掺合料混凝土技术快速发展和建筑节能要求不断提高背景下，通过压汞法试验，研究分析花岗岩石粉的细度及掺量对混凝土微观孔隙结构的影响规律，从微观层面论证花岗岩石粉作为混凝土掺合料的可行性，并在微观层面进行混凝土宏观抗渗抗冻试验的联系分析。研究表明：花岗岩石粉越细，对混凝土小孔径孔隙的填充作用越好，对大孔径孔隙填充作用不明显，综合填充效果较差；混凝土中掺入0~150 μm花岗岩石粉，当掺量为10%和20%时，对混凝土孔隙结构参数及孔级分配起到优化作用；0~150 μm花岗岩石粉掺量控制在30%以内时有利于提高混凝土抗渗性能；0~150 μm花岗岩石粉掺量控制在20%以内时可保证掺合料混凝土抗冻等级与不掺石粉的混凝土抗冻等级相同，当花岗岩石粉掺量增大至30%时，掺合料混凝土抗冻等级有所降低。
Effects of granite powder fineness and addition on concrete microscopic pores
- 1. Water Conservancy and Civil Engineering College， Shandong Agricultural University， Tai’an
- Available Online:
Abstract: With the rapid development of admixture concrete technologies and increasing requirements of building for energy saving, the experimental studies on the influence of the fineness and addition of the granite powder on concrete microscopic pore structure with MIP (mercury-intrusion porosimetry) method are carried out in order to prove the feasibility of the granite powder as concrete admixture at the micro level and reveal the impermeability and antifreezing properties of concrete at the micro level. It is found from the studies that the smaller the fineness, the better the filling effect on smaller pores, but the integrated filling effects perform poorly; when the addition is 10% and 20%, the granite powder fineness is 0~150 μm, which plays an optimized role in concrete porosity and pore structure parameters; when the admixture dosage is controlled within 30%, the granite powder fineness is 0~ 150 μm, which is in favor of improving the impermeability of concrete; when the granite powder dosage is controlled within 20%, it can ensure the antifreezing properties of admixture concrete and non-doped powder concrete at the same level; and the admixture concrete antifreezing level decreases with the addition of granite powder being up to 30%.