碳酸化钢渣复合胶凝材料早期水化活性

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、28d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、28d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CaC03与水泥中的C3A反应生成水合碳铝酸钙。

Early Hydration Activity of Composite with Carbonated Steel Slag

By adjusting the initial water content to control the carbonative level of steel slag (CO 2 mass gain), we used a mortar strength test method to measure the activity index of carbonated steel slag, and analyzed the mineral phases and morphology of hardened paste to understand the hydration activity of steel slag cement. The results show that the CO 2 mass gain increases first and then decreases with increasing the initial water content. The content of free-CaO decreased from 3.92% to 1.11% after carbonated steel slag. The steel slag with 19% water was carbonated, generating CaCO 3 of 15.95%. At the same of CO 2 mass gain, the 3 d and 28 d activity indexes at the initial water content of 11.8% were higher than those at other initial water contents (i.e., 5%, 21% and 49%, respectively). Compared to the uncarbonated steel slag, the 3 d and 28 d activity indexes of carbonated steel slag could be increased by 97% and 16% at the initial water content of 19%. CaCO 3 generated due to the carbonation reacted with C 3 A in hydrated cement, which could produce calcium carboaluminate hydrate.