碳化养护蒸压加气混凝土改性水泥的抗硫酸盐侵蚀性能

Sulfate Resistance of Carbonation Curing Autoclaved Aerated Concrete Modified Cement Paste

摘要:

研究了碳化养护对硅酸盐水泥（PC）-蒸压加气混凝土（WAAC）抗硫酸盐侵蚀性能的影响，测试了PC-WAAC在不同硫酸盐浸泡时间后的抗压强度、体积和质量变化，并对硫酸盐侵蚀后PC-WAAC的微观结构及劣化机理进行了分析.结果表明：碳化养护后，WAAC掺量为0%、10%、20%的PC-WAAC硫酸盐侵蚀180 d后的抗压强度比其对应的未碳化养护侵蚀前的水泥净浆抗压强度分别高6.55%、15.12%、22.54%；硫酸盐侵蚀180 d后，碳化养护PC-WAAC净浆的抗压强度降低值明显低于未碳化养护水泥净浆，碳化养护提高了PC-WAAC的抗硫酸盐侵蚀性能，缓解了硫酸盐侵蚀造成的抗压强度损失.

Abstract:

The effect of carbonation curing on the sulfate resistance of Portland cement（PC）- autoclaved aerated concrete （WAAC） was studied. The changes of compressive strength， volume deformation and mass of PC-WAAC were tested after different sulfate attack ages， and the microstructure and deterioration mechanism of PC-WAAC after sulfate attack were analyzed. The results show that after carbonation curing， the compressive strength of PC-WAAC with 0%， 10% and 20% WAAC content after 180 days of sulfate exposure is 6.55%， 15.12% and 22.54% higher than those of the corresponding cement paste before sulfate attack and carbonation curing， respectively. After 180 days sulfate erosion， the compressive strength reduction value of the carbonation curing PC-WAAC is significantly lower than those of cement paste without carbonation curing. Carbonation curing improves the sulfate resistance of PC-WAAC， and alleviates the compressive strength loss caused by sulfate attack.