论文部分内容阅读
针对当前对碱激发水泥混凝土碳化行为认识的不足,开展了不同加速龄期和不同碳化条件下碱激发水泥砂浆的碳化深度、强度和收缩实验。结果表明:碱激发水泥碳化速率较快,碳化后砂浆抗折和抗压强度均降低,完全碳化时,抗折强度降低50%以上,碳化后集料周围出现较多微裂纹。采用XRD、FTIR、SEM等分析方法探索碱激发水泥抗碳化性能不良的机理。根据普通水泥碳化预测公式,结合实验结果,估算了碱激发水泥砂浆的碳化寿命。碱激发水泥欲推广使用,须改善其抗碳化性能。
In view of the current lack of understanding of the carbonation behavior of alkali-activated cement concrete, the carbonation depth, strength and shrinkage tests of alkali-activated cement mortar under different accelerated ages and different carbonation conditions were carried out. The results show that the carbonization rate of alkali-activated cement is faster, and the flexural and compressive strength of mortar after carbonization are lower. When fully carbonized, the flexural strength decreases by more than 50% and more micro-cracks appear around the carbonized aggregates. The mechanism of poor carbonation resistance of alkali-activated cement was explored by XRD, FTIR and SEM. According to the prediction formula of ordinary cement carbonation, combined with the experimental results, the carbonation life of alkali-activated cement mortar was estimated. Alkali-activated cement to promote the use, to improve its anti-carbonation properties.