摘要
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。
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.
作者
马超
姚兆龙
杨钊
王新龙
蒋道东
MA Chao;YAO Zhao-long;YANG Zhao;WANG Xin-long;JIANG Dao-dong(CCCC Second Harbour Engineering Company Ltd.,Wuhan 430100,China;Research and Development Center of Transport Industry on Intelligent Manufacturing Technologies for Transport Infrastructure,Wuhan 430100,China;Key Laboratory of Transport Industry on Large-span Bridge Construction Technology,Wuhan 431400,China)
出处
《长江科学院院报》
CSCD
北大核心
2024年第6期164-170,共7页
Journal of Changjiang River Scientific Research Institute
基金
交通运输行业重点科技项目(2022-ZD4-064)。
关键词
钢渣粉
硅灰
流变
早期水化热
强度
吸水率
steel slag powder
silica fume
rheology
early hydration heat
strength
water absorption
作者简介
马超(1982-),男,宁夏银川人,高级工程师,硕士,主要从事岩土工程研究。E-mail:51338463@qq.com;通信作者:姚兆龙(1993-),男,安徽宣城人,工程师,硕士,主要从事高性能混凝土研究。E-mail:941010593@qq.com。
