Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material
Joint Authors
Qi, Tingye
Guo, Yuxia
Du, Xianjie
Wang, Zehua
Li, Qingdong
Wang, Peng
Feng, Guorui
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-03-10
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
Cemented gangue backfill material (CGBM) is made of coal gangue, fly ash, cement, and water.
The backfill body will be corroded by mine water that contains different kinds of corrosive ions.
The paper mainly aimed to study the diffusion process of sulfate ion (SO42−) in CGBM.
Soluble salt solutions with different concentrations are prepared to simulate various mine water.
The SO42− concentration was measured by layered sampling method and chemical analyzing method.
The diffusion coefficient was calculated according to the second Fick’s law.
Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to analyze the degradation mechanisms.
The experimental results showed that the SO42− concentration increases in CGBM when the external sulfate solutions concentration increases.
With the increasing of magnesium ion (Mg2+) concentration and bicarbonate ion (HCO3−) concentration in the external corrosion solutions, the diffusion coefficient of SO42− was increased, and HCO3− has more significant effects than Mg2+.
SO42− reacting with CGBM produced ettringite and gypsum.
The ettringite and gypsum changed the pore structure of hardened CGBM and affected the compressive strength of hardened CGBM.
Studying the diffusion of SO42− can contribute to predicting the service life of CGBM.
American Psychological Association (APA)
Guo, Yuxia& Wang, Peng& Feng, Guorui& Qi, Tingye& Du, Xianjie& Wang, Zehua…[et al.]. 2020. Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1122049
Modern Language Association (MLA)
Guo, Yuxia…[et al.]. Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material. Advances in Civil Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1122049
American Medical Association (AMA)
Guo, Yuxia& Wang, Peng& Feng, Guorui& Qi, Tingye& Du, Xianjie& Wang, Zehua…[et al.]. Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1122049
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1122049