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通过调节初始加水量控制钢渣的碳酸化效果(碳酸化质量增加率),利用胶砂强度试验法测定碳酸化钢渣的活性指数,以及分析硬化浆体矿物相和微观形貌,研究碳酸化钢渣水泥水化活性。结果表明:随着初始加水量的增加,碳酸化质量增加率先增加后降低;钢渣中的游离氧化钙(f-CaO)含量经碳酸化后,由3.92%降至1.11%;加水量为19%的钢渣经碳酸化后,生成15.95%的CaCO3;碳酸化质量增加率相同时,加水量为11.8%的碳酸化钢渣3、28 d活性指数较21%加水量的分别高49%和5%。在初始加水量为19%时,碳酸化钢渣3、28 d活性指数为最大值,较未碳酸化钢渣水化活性可提高97%和16%;碳酸化生成的CaCO3与水泥中的C3A反应生成水合碳铝酸钙。
The carbonation effect (carbonation quality increase rate) of steel slag was controlled by adjusting initial water adding amount, the activity index of carbonized steel slag was determined by mortar strength test, and the mineral phase and micro-morphology of hardened cement were analyzed. Hydration activity. The results showed that with the increase of initial water addition, the increase of carbonation mass firstly increased and then decreased; the content of free calcium oxide (f-CaO) in steel slag decreased from 3.92% to 1.11% after carbonation; the amount of water added was 19% Of carbonized steel slag produced 15.95% CaCO3. When the carbonation mass increase rate was the same, the activity index of carbonated steel slag with 11.8% water addition was 49% and 5% higher than that of 21% water addition after 28.8 days respectively. When the initial water content was 19%, the activity index of carbonated steel slag was the maximum value at 3,28 d, which was 97% and 16% higher than that of uncarbonated steel slag. The carbonated CaCO3 reacted with C3A in cement Hydrated carbonated calcium aluminate.