钢渣粉与硅灰复掺水泥基材料的流变、早期水化热与强度
Rheology,Early Hydration Heat and Strength of Cement-based Materials Mixed with Steel Slag Powder and Silica Fume
马超 1姚兆龙 2杨钊 1王新龙 2蒋道东1
作者信息
- 1. 中交第二航务工程局,武汉 430100;交通运输行业交通基础设施智能制造技术研发中心,武汉 430100;长大桥梁建设施工技术交通行业重点实验室,武汉 431400
- 2. 中交第二航务工程局,武汉 430100
- 折叠
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.
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 com-posite 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-dis-tance 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引用本文复制引用
基金项目
交通运输行业重点科技项目(2022-ZD4-064)
出版年
2024
国家科技期刊平台
NSTL
万方数据