纳米SiO2对钢渣水泥基胶凝材料的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (5): 1594-1600.

所属专题：资源综合利用

纳米SiO₂对钢渣水泥基胶凝材料的影响

吴思遥¹, 戴绍斌¹, 马保国², 张婷², 杨航¹, 尚丽诗¹

1.武汉理工大学土木工程与建筑学院,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2020-10-14 修回日期:2021-03-15 出版日期:2021-05-15 发布日期:2021-06-07
通讯作者: 戴绍斌,博士,研究员。E-mail:dsb123@whut.edu.cn
作者简介:吴思遥(1995—),男,硕士研究生。主要从事混凝土新材料方面的研究。E-mail:wusiyao@whut.edu.cn

Effect of Nano-SiO₂ on Steel Slag/Cement-Based Cementitious Materials

WU Siyao¹, DAI Shaobin¹, MA Baoguo², ZHANG Ting², YANG Hang¹, SHANG Lishi¹

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2020-10-14 Revised:2021-03-15 Online:2021-05-15 Published:2021-06-07

摘要/Abstract

摘要： 钢渣和水泥具有相似的矿物组成,可以作为一种潜在的胶凝材料,然而钢渣掺量较高时并不利于混凝土早期性能的发展。以钢渣质量分数为30%的钢渣水泥基胶凝材料为研究对象,探讨纳米SiO₂对其早期性能的影响。主要通过测量流动度、凝结时间和抗压强度评估物理力学性能,并利用微量热分析、X射线衍射(XRD)、差热分析(DSC-TG)等方法对掺有纳米SiO₂的钢渣水泥基胶凝材料的水化过程和水化产物进行分析。结果表明,当纳米SiO₂掺入的质量分数为3%时,纳米SiO₂可充分发挥火山灰活性,消耗大量Ca(OH)₂,同时由于纳米SiO₂颗粒的结晶成核作用和微集料填充作用,促进了钢渣和水泥的水化,水化初期的放热速率有所提高,从而提高钢渣水泥基胶凝材料的力学性能,28 d的抗压强度提高了14.0%。

关键词: 纳米SiO₂, 钢渣, 水泥, 水化, 抗压强度

Abstract: Steel slag has similar mineral composition with cement, which can be used as a potential cementitious material. However, the high content of steel slag is not conducive to the development of early properties of concrete. Steel slag/cement-based cementitious materials with 30%(by weight) steel slag as the research object were used to discuss the influence of nano-SiO₂ on its early properties. Physical and mechanical properties were evaluated by measuring fluidity, setting time, and compressive strength. The hydration process and hydration products of steel slag/cement-based cementitious materials with nano-SiO₂ were analyzed by micro-thermal analysis, X-ray diffraction (XRD), and differential scanning calorimetry (DCS-TG). Results show that when the mass fraction of nano-SiO₂ is 3%, nano-SiO₂ consumes large amounts of Ca(OH)₂ due to its high pozzolanic activity. Meanwhile, due to the crystallization nucleation and micro-aggregate filling effect of nano-SiO₂ particles, the hydration of steel slag and cement is promoted, and the heat release rate at the initial stage of hydration is improved, thus improving the mechanical properties of steel slag/cement-based cementitious materials, and the 28 d compressive strength increases by 14.0%.

Key words: nano-SiO₂, steel slag, cement, hydration, compressive strength

中图分类号:

TQ172

吴思遥, 戴绍斌, 马保国, 张婷, 杨航, 尚丽诗. 纳米SiO₂对钢渣水泥基胶凝材料的影响[J]. 硅酸盐通报, 2021, 40(5): 1594-1600.

WU Siyao, DAI Shaobin, MA Baoguo, ZHANG Ting, YANG Hang, SHANG Lishi. Effect of Nano-SiO₂ on Steel Slag/Cement-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1594-1600.

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纳米SiO₂对钢渣水泥基胶凝材料的影响

Effect of Nano-SiO₂ on Steel Slag/Cement-Based Cementitious Materials

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