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- Title
Experimental Study on the Permeability of a Super Absorbent Cementitious Backfill Material.
- Authors
Zhao, Fengwen; Hu, Jianhua; Zhang, Tao
- Abstract
To reduce the bleeding rate of backfill in a goaf, a new backfill material with low bleeding rate was proposed and tested. Centrifugal means were applied to nuclear magnetic resonance technology, and the permeabilities of backfill were estimated with the Coates model. The spectral dimension was used to quantitatively analyze the pore connectivity inside the backfill. The relationships between pore parameters and permeability were established. The results showed that (1) there were three kinds of pores in the backfill. Based on the characteristics of water, the pores were divided into two parts (bound fluid volume index and free fluid index) with the T2cut-off value. Bound fluid volume index contained bound water, which accounts for 73.26%–86.94%, and free fluid index contained free water, which accounts for 13.06%–26.74%. (2) The pseudo-capillary pressure curve reflected the changes in permeability of backfill with super-absorbent polymer content. (3) The effect of the spectral fractal was good (R2 > 0.84), which explained the connectivity of pores well. The spectral dimension was between 1.72 and 1.94. (4) There was an exponentially increasing relationship between the permeability and spectral dimension (R2 = 0.999), that is, K = a*ebx + c. The permeability also increased linearly with the weighted average T2 (pore size) (R2 = 0.96), that is, y = k*x + b.
- Subjects
SUPERABSORBENT polymers; NUCLEAR magnetic resonance; PERMEABILITY; SOIL permeability
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 2, p348
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05605-5