硅铝质掺合料对含石灰石组分水泥基材料硫酸盐侵蚀的影响

Effect of sialic mineral admixture on sulfate attack of cement-based material with limestone

通过腐蚀试验后试件的外观形貌和强度变化、腐蚀物相分析,研究较低环境温度下硅铝质掺合料对含石灰石组分水泥基材料硫酸盐侵蚀的影响。结果表明:随着硅铝质掺合料掺量的增加,含石灰石粉硅酸盐水泥试件外观完整性明显提高,强度损失率逐渐降低;当硅铝质组分掺量为15%、30%时,矿粉对含石灰石组分水泥基材料抗硫酸盐侵蚀的改善作用明显优于相同掺量的粉煤灰;硅铝质组分能够延缓较低环境温度下含石灰石粉硅酸盐水泥的硫酸盐侵蚀,抑制腐蚀物相碳硫硅钙石的生成。

The effect of a sialic mineral admixture on the sulfate attack of cement-based material with limestone at low temperature was studied based on analysis of the visual appearance and strength changes of specimens, and erosion phases through erosion experiments. The results show that, with an increase of the content of the sialic mineral admixture, the integrity of the Portland cement specimens with limestone powder improved, and the strength loss ratios of the specimens decreased. When 15% and 30% of sialic mineral admixtures were added, the mineral powder had a greater effect in increasing the resistance to sulfate attack of the cement-based material with limestone than fly ash with the same content. Furthermore, the sialic mineral admixture could defer the sulfate attack of Portland cement with limestone powder at low temperature, and restrain the formation of thaumasite.