矿渣-电炉还原渣全固废胶凝材料的水化机理  

Hydration mechanism of blast furnace slag-reduction slag based solid waste cementing materials

作　　者：倪文[1,2] 李颖 许成文[1,2] 徐东 姜瑶琪[1,2] 高广军 NI Wen;LI Ying;XU Chengwen;XU Dong;JIANG Yaoqi;GAO Guangjun(School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083,China;Key Laboratory of High?Efficient Mining and Safety of Metal Mines, Ministry of Education,University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《中南大学学报（自然科学版）》2019年第10期2342-2351,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41472043);国家重点研发计划重点专项项目(2017YFC0210301)

摘　　要：以我国台湾省的矿渣、电炉还原渣和脱硫石膏为主要原料制备矿渣.电炉还原渣.石膏体系胶凝材料,28d的胶砂抗压强度达到39MPa,可在某些场合作为普通水泥来使用。采用3种方法检测胶凝材料的安定性,其结果均符合国家标准;采用X线衍射(XRD)、场发射扫描电镜(FE-SEM)、能量色散谱(EDS)、傅里叶红外光谱(FT-IR)、热重.差示扫描量热法(TG-DSC)和X线光电子能谱(XPS)分析胶凝材料的水化过程。研究结果表明:水化产物主要为钙矾石和C-S-H凝胶,水化产物的聚合度随龄期的增长而增加;在水化反应中,矿渣提供具有潜在水硬活性的硅氧四面体和铝氧四面体,电炉还原渣提供碱性氧化物,石膏提供硫酸根离子;三者协同作用形成的钙矾石类复盐和非晶态的C-S-H凝胶是材料强度的主要来源。Blast furnace slag (BFS), reduction slag of electric furnace (RS) and desulphurization gypsum (DG) from Taiwan Province of China were used to prepare BFS-RS-DG cementitious materials. Compressive strength of cementitions material is 39 MPa at 28 d, which can substitute ordinary portland cement in some cases. Three methods were used to test the soundness of the cementing materials, and the results meet the national standards. The hydration and hardening process of cementing materials was analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy(FE-SEM), energy dispersive spectroscopy(EDS), fourier transform infrared spectroscopy(FT-IR), thermogravimetric-differential scanning calorimetry analysis(TG-DSC) and X-ray photoelectron spectroscopy (XPS). The results show that the main hydration products are ettringite and C-S-H gel, and the degree of polymerization of hydration products increases with the increase of the curing age. In the process of hydration, BFS provides silicon ?oxygen tetrahedron and Aluminum ?oxygen tetrahedron with basic oxide from RS and sulphate ion from DG. The synergistic reaction of three raw materials forms amorphous C?S?H gel and double salt phases such as ettringite, which provides the main source of strength of materials.

关 键 词：电炉还原渣 胶凝材料 钙矾石 C-S-H凝胶 协同作用 复盐效应 

分 类 号：TU526[建筑科学—建筑技术科学]