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研究了活性氧化镁对碱矿渣混凝土抗碳化性能的影响。研究了掺入氧化镁后浆体吸水率、混凝土干缩率、抗氯离子渗透性能,以及混凝土碳化深度的变化,并进一步分析掺入氧化镁后浆体水化产物和碳化产物的变化。结果显示,掺入氧化镁有助于降低浆体的吸水率、减少混凝土干缩和提高混凝土抗渗性。此外,氧化镁促进浆体中类水滑石的生成,碳化时延缓C-S-H凝胶的分解。最终导致混凝土碳化深度的降低。56d时,掺入3%氧化镁可以使碳化深度下降60%,而掺入6%氧化镁可使碳化深度下降80%以上。
The effect of activated magnesia on carbonation resistance of alkali slag concrete was studied. After the incorporation of magnesia, the water absorption of the slurry, the shrinkage of the concrete, the resistance to chloride ion permeability and the depth of carbonation of the concrete were investigated. The changes of hydration products and carbonized products of the slurry after the incorporation of magnesia were further analyzed. The results show that the incorporation of magnesia helps to reduce the water absorption of the slurry, reduce the shrinkage of concrete and improve the impermeability of concrete. In addition, magnesia promotes the formation of hydrotalcite-like species in the slurry and retards the decomposition of C-S-H gel during carbonization. Eventually leading to the reduction of concrete carbonation depth. At 56 days, the carbonization depth was reduced by 60% with the incorporation of 3% magnesia, while the incorporation of 6% magnesia decreased the carbonization depth by more than 80%.