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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mater. | doi: 10.3389/fmats.2019.00211

Microstructure and composition of hardened paste of soda residue-slag-cement binding material system

Qingxin Zhao1, Jizhong Liu1 and  Jinrui Zhang2*
  • 1Yanshan University, China
  • 2Tianjin University, China

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 salt constituted the main strength source of the whole soda residue-slag-cement binding material system.

Keywords: Soda residue, slag, binding material, Hydration products, Friedel’s salt

Received: 09 Oct 2018; Accepted: 14 Aug 2019.

Edited by:

John L. Provis, University of Sheffield, United Kingdom

Reviewed by:

Ionut Ovidiu Toma, Gheorghe Asachi Technical University of Iași, Romania
Marija Nedeljkovic, Delft University of Technology, Netherlands  

Copyright: © 2019 Zhao, Liu and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Jinrui Zhang, Tianjin University, Tianjin, China, jinrui.zhang@tju.edu.cn