Performance of Coal Gangue-Based Cemented Backfill Material Modified by Water-Reducing Agents
Joint Authors
Qi, Tingye
Guo, Yuxia
Wang, Peng
Feng, Guorui
Liu, Guoyan
Ren, Ang
Source
Advances in Materials Science and Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-01-11
Country of Publication
Egypt
No. of Pages
11
Abstract EN
Coal gangue-based cemented backfill material (CGCBM) is developed for backfilling the goaf in coal mines.
As fresh CGCBM slurry is generally transported into underground openings through a pipeline, and after hardening, it plays the role of supporting the overlying strata.
The fluidity, stability, and mechanical (compressive strength) of CGCBM become the most important properties.
Adding water-reducing agents (WRAs) is considered to improve the fluidity, stability, and mechanical properties of CGCBM, but there is a risk of increased bleeding.
So, two types of WRA (naphthalene series (WRA1) and poly carboxylic acid (WRA2)) are used at different contents (1.0%-2% for WRA1, 0.2%–0.6% for WRA2) by mass of binder.
Slump, slump flow, yield stress, and plastic viscosity test are used to evaluate the fluidity properties of CGCBM after adding WRA.
Bleeding rate test is used to evaluate the stability of CGCBM after adding WRA.
Compressive strength is the most important factor in measuring the mechanical properties.
SEM and XRD tests are used to analyse the mechanism of strength change.
Results show that the slump, slump flow, and plastic viscosity increase after adding WRA, which reduces the yield stress and improves the fluidity.
The bleeding rate increases with the increase of WRA content, leading to a decrease in stability.
Adding WRA increases the compressive strength, and it increases first and then decreases with the increase of the content at the later stage.
Considering the effects of WRA on the fluidity, stability, and compressive strength properties of CGCBM, the reasonable content of WRA1 and WRA2 is 1.5% and 0.4%, respectively.
The research results provide guidance for the design and preparation of CGCBM with favourable performance in practical production.
American Psychological Association (APA)
Guo, Yuxia& Wang, Peng& Feng, Guorui& Qi, Tingye& Liu, Guoyan& Ren, Ang. 2020. Performance of Coal Gangue-Based Cemented Backfill Material Modified by Water-Reducing Agents. Advances in Materials Science and Engineering،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1127989
Modern Language Association (MLA)
Guo, Yuxia…[et al.]. Performance of Coal Gangue-Based Cemented Backfill Material Modified by Water-Reducing Agents. Advances in Materials Science and Engineering No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1127989
American Medical Association (AMA)
Guo, Yuxia& Wang, Peng& Feng, Guorui& Qi, Tingye& Liu, Guoyan& Ren, Ang. Performance of Coal Gangue-Based Cemented Backfill Material Modified by Water-Reducing Agents. Advances in Materials Science and Engineering. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1127989
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1127989