Microstructure and Composition of Hardened Paste of Soda Residue-Slag-Cement Binding Material System

Frontiers in Materials

Rongjie Song¹  Jizhong Liu¹  Qingxin Zhao¹  Jinrui Zhang² 

[1] Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Yanshan University, Qinhuangdao, China;State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China;State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China;

关键词: soda residue;    slag;    binding material;    hydration products;    Friedel's salt;   

DOI  :  10.3389/fmats.2019.00211

来源: DOAJ

【 摘 要 】

In order to utilize industrial waste soda residue, a kind of binding material system based on soda residue-slag-cement has been developed. The microstructure and composition of hardened paste of the binding material system after curing for 28 days was analyzed by means of scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and thermogravimetric-differential scanning calorimetry (DSC-TG). The main hydration products of binding material system after curing for 28 days were C-S-H gel and 3CaO·Al2O3·CaCl2·10H2O crystal (Friedel's salt) with a needle bar and irregular shape. The Ca/Si ratio of C-S-H gel in hydration products varied from 0.7 to 1.4, the ratio of n(Cx-S-Hy)/n(3CaO·Al2O3·CaCl2·10H2O) varied in the range of 1.8–6.4. The C-S-H gel and Friedel's salts that densely arranged and closely bonded with pores and cracks constituted the main strength source of the whole soda residue-slag-cement binding material system.

【 授权许可】

Unknown