| 引用本文: | 张少峰,牛荻涛,罗大明,王艳.激发剂对钢渣水泥的活化及作用机理[J].哈尔滨工业大学学报,2024,56(1):165.DOI:10.11918/202302068 |
| ZHANG Shaofeng,NIU Ditao,LUO Daming,WANG Yan.Activation of activator on steel slag-cement and its hydration mechanism[J].Journal of Harbin Institute of Technology,2024,56(1):165.DOI:10.11918/202302068 |
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| 激发剂对钢渣水泥的活化及作用机理 |
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张少峰1,牛荻涛1,2,罗大明1,2,王艳2,3
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(1.西安建筑科技大学 土木工程学院,西安 710055;2.省部共建绿色建筑国家重点实验室(西安建筑科技大学), 西安710055; 3.西安建筑科技大学 材料科学与工程学院,西安 710055)
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| 摘要: |
| 为考察不同碱性激发剂对钢渣水泥性能的影响,开展碱性激发剂（水玻璃、Na2CO3/NaOH、NaOH）对钢渣水泥宏观力学性能影响的试验研究,并采用水化热测试、X射线衍射（XRD）、热重分析（DSC-TG）、扫描电子显微镜（SEM）和压汞试验（MIP）对其微观结构进行研究。结果表明:碱性激发剂提高钢渣水泥早期水化时孔隙液的碱度,加速钢渣玻璃体解聚并生成H3SiO-4和H3AlO2-4,增大体系反应速率,加速C-S-H凝胶和沸石类产物的形成,从而宏观上表现为凝结时间降低,诱导期缩短,反应热峰值和累计放热量增加,早期强度提高；激发剂对钢渣水泥性能的影响与其分子结构有关,影响顺序由大到小依次为水玻璃、Na2CO3/NaOH和NaOH；水玻璃不仅可增大钢渣水泥早期水化时液相的碱度,同时激发剂中的SiO2-3可与Ca(OH)2反应,生成水化产物C-S-H凝胶。掺入碱性激发剂可促进钢渣水泥水化反应的进行,有助于钢渣水泥力学性能与微观结构致密性的提升。 |
| 关键词: 碱性激发剂 钢渣 复合胶凝体系 水化特性 微观结构 |
| DOI：10.11918/202302068 |
| 分类号:TU375 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(3,7)；国家优秀青年科学基金(52222806)；陕西省杰出青年科学基金(2022JC-20) |
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| Activation of activator on steel slag-cement and its hydration mechanism |
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ZHANG Shaofeng1,NIU Ditao1,2,LUO Daming1,2,WANG Yan2,3
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(1.College of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China; 2.State Key Lab of Green Building in Western China (Xian University of Architecture and Technology), Xian 710055, China; 3.College of Materials Science and Engineering, Xian University of Architecture and Technology, Xian 710055, China)
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| Abstract: |
| To study the influence of the alkaline activator on the performance of steel slag cement, the effects of alkaline activators (water glass、Na2CO3/NaOH、NaOH) on the macroscopic mechanical properties of steel slag cement are studied in this article. Further, the microscopic characteristic is investigated by hydration heat release, X-ray diffraction (XRD), thermogravimetric analysis (DSC-TG), scanning electron microscope (SEM) and mercury intrusion porosimetry test (MIP). The results show that the alkaline activators increased the basicity in the early hydration liquid phase of steel slag cement, accelerating depolymerization of steel slag vitreous to produce H3SiO-4 and H3AlO2-4, improving the reaction rate, facilitating the formation of C-S-H gel and zeolite products, which is manifested by the shortening of setting time and induction period, the increase of reaction heat, cumulative heat release and early mechanical strength; the influence of alkaline activators on the properties of steel slag cement is related to its molecular structure of activators, and the order of influence was water glass, Na2CO3/NaOH, NaOH in descending order; Water glass could increase the alkalinity of liquid phase in steel slag cement, and the SiO2-3 could react with Ca(OH)2 to produce C-S-H gel. The addition of alkaline activators can promote the hydration reaction of steel slag cement, which is helpful to the improvement of the mechanical properties and the compactness of the microstructure of steel slag cement. |
| Key words: alkaline activator steel slag composited cementitious system hydration property microstructure |
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