钢渣-矿渣基胶凝材料的协同水化机理  

Synergistic Hydration Mechanism of Steel Slag‑Slag Based Cementitious Material

作　　者：南雪丽[1,2] 杨旭 张宇 唐维斌[3] 张富强 NAN Xuei;YANG Xu;ZHANG Yu;TANG Weibin;ZHANG Fuqiang(School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Provincial Transport Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030

出　　处：《建筑材料学报》2024年第4期366-374,共9页Journal of Building Materials

基　　金：甘肃省住房和城乡建设厅科技规划项目(JK2021-11);甘肃省科技重大专项项目(21ZD3GA002);甘肃省交通运输厅2021年第一批揭榜挂帅制项目(2021-02)。

摘　　要：通过胶砂强度试验及X射线衍射仪(XRD)、热失重分析(TG-DTG)、扫描电镜-能谱仪(SEM-EDS)等微观测试技术,对不同配合比钢渣-矿渣基胶凝材料的力学性能、水化产物及其水化硬化过程进行了研究.结果表明:当胶凝材料的n(CaO+MgO)/n(SiO2+Al2O3)=0.90时,其水化后期有较多的水化硅酸钙、水化铝酸钙凝胶生成,微观结构更加致密,力学性能表现最优,28 d抗压强度和抗折强度分别达到20.20、7.25 MPa;pH值的变化反映出协同水化效应的关键在于钢渣活性矿物的溶解和矿渣的二次火山灰反应,钢渣和矿渣的最佳配合比可以保证水化程度有较高的水平.The mechanical properties,hydration products and hydration hardening processes of steel slag-slag based cementitious materials with different mix proportion were investigated using mortar strength tests and microscopic testing techniques such as X-ray diffraction(XRD),thermogravimetric analysis(TG-DTG)and scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS).The results show that when n(CaO+MgO)/n(SiO2+Al2O3)is 0.90,more hydrated calcium silicate and hydrated calcium aluminate gels are generated in the later stage of hydration,the microstructure is more dense and the mechanical properties are the best.The compressive and flexural strength reach 20.20,7.25 MPa at 28 days.The changes in pH value show the synergistic effect of hydration resulting from the dissolution of active minerals in steel slag and the occurrence of secondary fly ash reactions in slag.The optimal mix proportion of steel slag and slag ensures a higher level of hydration.

关 键 词：钢渣 高炉矿渣 胶凝材料 协同水化效应 水化反应 

分 类 号：TU526[建筑科学—建筑技术科学]