水泥-蔗渣灰-矿粉海砂砂浆的抗压强度与抗氯盐渗透性能研究

Study on Compressive Strength and Chloride Penetration Resistance of Cement-Bagasse Ash-Slag Sea-sand Mortar

本工作通过单纯型重心设计方法研究水泥-蔗渣灰(SCBA)-矿粉(BFS)三元胶凝材料组成对流动度、抗压强度、氯离子扩散系数、孔隙结构、水化产物以及体积电导率的影响。研究结果表明:尽管随着蔗渣灰掺量的增加,抗压强度下降,但蔗渣灰能显著降低海砂砂浆的氯离子扩散系数。随着矿粉掺量的增加,海砂砂浆抗压强度略微增加,氯离子扩散系数显著降低。当水泥掺量为70%~75%、蔗渣灰为0%~10%、矿粉为10%~30%时,三元体系海砂砂浆的强度最高,氯离子扩散系数最低。海砂砂浆的抗压强度随着毛细孔体积和最可几孔径的增大而减小,氯离子扩散系数是由孔隙结构与孔隙溶液的化学性质共同决定的。

In this work,the effect of cement-bagasse ash(SCBA)-slag(BFS)ternary cementitious on the fluidity,compressive strength,chloride diffusion coefficient,pore structure,hydration products and bulk conductivity of mortar was studied by using simplex centroid design method.The results showed that the compressive strength decreased with the increase of bagasse ash content,but it can significantly reduce the chloride diffusion coefficient of sea-sand mortar.With the increase of the content of slag,the compressive strength increased slightly,and the chloride diffusion coefficient decreased significantly.When the cement content was 70%—75%,bagasse ash was 0%—10%,and slag was 10%—30%,the strength of sea-sand mortar was the highest,and the chloride diffusion coefficient was the lowest.The compressive strength of sea-sand mortar decreased with the increase of capillary pore and the most probable pore diameter.The chloride diffusion coefficient was determined by the pore structure and the chemical properties of pore solution.