Microstructure and Composition of Hardened Paste of Soda Residue-Slag Complex Binding Materials

被引：0
|
作者：
Liu J. [1 ]
Zhao Q. [1 ]
Zhang J. [2 ]
An S. [1 ]
机构：
[1] Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Yanshan University, Qinhuangdao
[2] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
[3] College of Urban Construction, Hebei Normal University of Science and Technology, Qinhuangdao
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2019年 / 22卷 / 06期
关键词：
Binding material; Hydration product; Slag; Soda residue;
D O I：
10.3969/j.issn.1007-9629.2019.06.006
中图分类号：
学科分类号：
摘要：
In order to recycle soda residue, a kind of binding material from it to mix with slag was developed. Meanwhile, microstructures and compositions of hardened paste of soda residue-slag complex binding materials(SSCBM) after curing for 28days were analyzed by means of scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction and thermogravimetric-differential scanning calorimetry. The results show that when water-binder ratio is 0.5 and sand-binder ratio is 3:1, soda residue and slag are prepared according to the mass percentage of 1:4, the compressive strength of the SSCBM specimen(40mm×40mm×160mm) is 39.6MPa, the flexural strength is 8.0MPa, and the chemical binding rate of chloride ions is 84.4%. A large number of hydration products between 510μm are observed in the SSCBM system; meanwhile, the hydration products are bonded to each other to form a dense three-dimensional network structure. The hydration products of binding materials after curing for 28days are mainly C-S-H gel, C-A-C-H gel, C-A-S-H gel and 3CaO•Al2O3•CaCl2•10H2O crystal(Friedel's salt). © 2019, Editorial Department of Journal of Building Materials. All right reserved.
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页码：872 / 877
页数：5
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