地下水强酸盐复合腐蚀环境下不同矿物掺合料对水泥砂浆耐腐蚀性能的影响

摘要

The strong acid and salt composite groundwater in Guizhou province is simulated in the lab,and the influence of single addition and composite addition of mineral admixtures such as fly ash,slag and silica fume etc.on corrosion resistances of cement mortar using the evaluation indexes such as anti-corrosion coefficient,mass change fraction and chloride ion relative diffusion coefficient in the simulated solution is systematically studied.And its anti-corrosion mechanism of cement mortar is discussed.The results show that the single or composite addition of mineral admixtures results in the improvement of anti-corrosion coefficient,the reduction of chloride ion relative diffusion coefficient and the increase of mass change fraction of mortar compared with the control mortar.The three proposed evaluation indexes can evaluate the corrosion resistance of cement mortar exposed to strong acid and salt composite groundwater from different perspectives.%模拟了贵州地区地下水强酸盐复合腐蚀环境，系统研究了粉煤灰、矿渣粉和硅灰3种矿物掺合料单掺与复掺对水泥砂浆耐腐蚀性能，如耐蚀系数、质量变化率、氯离子相对扩散系数的影响规律，并探讨了地下水强酸盐复合腐蚀环境下水泥砂浆的腐蚀机理。结果表明，与基准砂浆相比，单掺与复掺矿物掺合料均提高了砂浆的耐蚀系数，降低了砂浆后期氯离子相对扩散系数，但增大了砂浆质量损失率。这3项指标从不同角度反映了地下水复合腐蚀环境下水泥砂浆的耐腐蚀性能。