为缓解大量存在且利用率很低的钢渣处理难题,将其研磨成微粉置换水泥,并掺入硅灰形成一种兼顾力学性能、绿色低碳水泥基材料。基于不同配比的复掺水泥基材料体系的流变行为、早期水化热、强度与吸水率试验研究,主要结果如下:钢渣粉颗粒微形貌棱角与片状较少,替代15%水泥时可有效改善基体稠度,略微降低强度,并显著降低早期水化放热(降幅8.8%),有利于控制早期温度裂缝。复掺硅灰可有效降低材料塑性黏度与泵送压力,对需要长距离泵送的大体积混凝土或高性能混凝土,硅灰掺量可控制在5%以内。且硅灰空间填充效应与火山灰反应会增强材料密实性,显著提高强度。综上,复掺15%钢渣粉和5%硅灰的水泥基材料,不仅可以改善泵送性能,提升强度和耐久性,还能降低早期水化放热量,具有良好的工程应用前景。
Abstract
To address the challenge of steel slag disposal, characterized by large quantities and low utilization rates, we prepared a green, low-carbon cement-based material with optimized mechanical properties by substituting part of the cement with steel slag ground into micro-powder and combined with silica fume. We conducted experimental studies on the rheological behavior, early hydration exotherm, strength, and water absorption of the prepared composite cement-based material system at various proportions. Our key findings are as follows: 1) Steel slag powder particles exhibits a less angular and flaky micro-morphology. When replacing 15% of the cement, steel slag powder effectively enhances matrix consistency, slightly reduces strength, and significantly decreases early hydration heat release by 8.8%, which is beneficial to the control of early temperature-induced cracking.2) Incorporating silica fume notably decreases the material’s plastic viscosity and pumping pressure. For applications requiring long-distance pumping, such as mass concrete or high-performance concrete, silica fume content should be limited to 5%. Additionally, silica fume’s space-filling effect and pozzolanic reaction enhances the material’s compactness and substantially improves strength. In summary, cement-based material incorporating 15% steel slag powder and 5% silica fume not only enhances pumping performance, strength, and durability but also mitigates early hydration heat release, demonstrating promising engineering applications.
关键词
钢渣粉 /
硅灰 /
流变 /
早期水化热 /
强度 /
吸水率
Key words
steel slag powder /
silica fume /
rheology /
early hydration heat /
strength /
water absorption
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基金
交通运输行业重点科技项目(2022-ZD4-064)
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