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Effect of the Initial Air Content in Fresh Slurry on the Compressive Strength of Hardened Cemented Paste Backfill
Joint Authors
Hu, Sheng
Zhang, Youzhi
Gan, Deqing
Xue, Zhenlin
Chen, Xun
Source
Advances in Materials Science and Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-11-12
Country of Publication
Egypt
No. of Pages
8
Abstract EN
Filling mining method can dispose of the tailings into filling slurry, which can be transported to the stope through pipelines to manage the ground pressure and protect the environment.
To improve the flowability of filling slurry, additives are used more and more widely.
However, some additives can increase the air content in the slurry.
The air in the slurry will become pores in the hardened cemented paste backfill (CPB).
Therefore, it is necessary to explore the influence of initial air content in fresh slurry on the compressive strength of CPB.
In this paper, sodium dodecyl sulfate (SDS) was used to regulate the air content in the fresh slurry.
After measuring the initial air content, the slurry was made into test blocks.
Then, the uniaxial compressive strength (UCS) of CPB at 28 d age was tested, and the distribution of CPB microscopic pores was observed by scanning electron microscope (SEM).
The results show that as the initial air content in fresh slurry increases, the UCS of CPB first increases and then decreases.
Before the initial air content in fresh slurry is 6.03%, the CPB pores distribution is relatively uniform.
However, after exceeding this value, “discontinuous contact” structures, pore groups, and macropores occur in CPB.
Through the CPB microscopic force analysis, the mathematical model describing the effect of initial air content on UCS of CPB should be a combination of logarithmic function and quadratic polynomial.
This work can provide a supplement to the theory of CPB strength.
American Psychological Association (APA)
Zhang, Youzhi& Gan, Deqing& Xue, Zhenlin& Chen, Xun& Hu, Sheng. 2020. Effect of the Initial Air Content in Fresh Slurry on the Compressive Strength of Hardened Cemented Paste Backfill. Advances in Materials Science and Engineering،Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1129414
Modern Language Association (MLA)
Zhang, Youzhi…[et al.]. Effect of the Initial Air Content in Fresh Slurry on the Compressive Strength of Hardened Cemented Paste Backfill. Advances in Materials Science and Engineering No. 2020 (2020), pp.1-8.
https://search.emarefa.net/detail/BIM-1129414
American Medical Association (AMA)
Zhang, Youzhi& Gan, Deqing& Xue, Zhenlin& Chen, Xun& Hu, Sheng. Effect of the Initial Air Content in Fresh Slurry on the Compressive Strength of Hardened Cemented Paste Backfill. Advances in Materials Science and Engineering. 2020. Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1129414
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1129414