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Infiltration behaviour and microstructure of filter cake from sand-modified bentonite slurry

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Abstract
This study uses a setup involving a scanning electron microscopy (SEM) to examine the infiltration behaviour and mechanism of the formation of filter cake from sand-modified bentonite slurry. We began by determining whether a filter cake can be formed by using water-bentonite slurry in samples of the fine, medium, and coarse sand (Series 1). Water-bentonite-sand slurries with different mass ratios of bentonite and fine sand (B:S) were subsequently tested using the medium and coarse sand (Series 2). The results show that for Series 1, a thin filter cake (<0.1 mm after drying) with extremely low permeability (similar to 10(-8) m/s) was formed only when the fine sand was used. The filter cake consisted of layers of dense bentonite platelets arranged perpendicular to the infiltration direction. Similar results were obtained for Series 2 between the medium and coarse sand. Within the range of 1:1.5 <= B:S <= 1:0.5, the low permeable filter cake was formed on the deposited layer of fine sand and bentonite platelet. Contrary to expectations, adding more sand (B:S = 1:2) did not complete the formation of filter cake, and instead led to continuous deposition of fine sand and bentonite platelet, which may cause inadequate effective face support during slurry shield tunneling.
Keywords
Geotechnical Engineering and Engineering Geology, Transportation, Civil and Structural Engineering, Filter cake, Infiltration behaviour, Fine sand, Bentonite platelet, Tunneling, SHIELD, SUSPENSIONS, STABILITY, PRESSURE

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MLA
Qin, Su, et al. “Infiltration Behaviour and Microstructure of Filter Cake from Sand-Modified Bentonite Slurry.” TRANSPORTATION GEOTECHNICS, vol. 40, 2023, doi:10.1016/j.trgeo.2023.100963.
APA
Qin, S., Xu, T., Zhou, W.-H., & Bezuijen, A. (2023). Infiltration behaviour and microstructure of filter cake from sand-modified bentonite slurry. TRANSPORTATION GEOTECHNICS, 40. https://doi.org/10.1016/j.trgeo.2023.100963
Chicago author-date
Qin, Su, Tao Xu, Wan-Huan Zhou, and Adam Bezuijen. 2023. “Infiltration Behaviour and Microstructure of Filter Cake from Sand-Modified Bentonite Slurry.” TRANSPORTATION GEOTECHNICS 40. https://doi.org/10.1016/j.trgeo.2023.100963.
Chicago author-date (all authors)
Qin, Su, Tao Xu, Wan-Huan Zhou, and Adam Bezuijen. 2023. “Infiltration Behaviour and Microstructure of Filter Cake from Sand-Modified Bentonite Slurry.” TRANSPORTATION GEOTECHNICS 40. doi:10.1016/j.trgeo.2023.100963.
Vancouver
1.
Qin S, Xu T, Zhou W-H, Bezuijen A. Infiltration behaviour and microstructure of filter cake from sand-modified bentonite slurry. TRANSPORTATION GEOTECHNICS. 2023;40.
IEEE
[1]
S. Qin, T. Xu, W.-H. Zhou, and A. Bezuijen, “Infiltration behaviour and microstructure of filter cake from sand-modified bentonite slurry,” TRANSPORTATION GEOTECHNICS, vol. 40, 2023.
@article{01GTGXXSWNPT11KQYA7TQXXK3Z,
  abstract     = {{This study uses a setup involving a scanning electron microscopy (SEM) to examine the infiltration behaviour and mechanism of the formation of filter cake from sand-modified bentonite slurry. We began by determining whether a filter cake can be formed by using water-bentonite slurry in samples of the fine, medium, and coarse sand (Series 1). Water-bentonite-sand slurries with different mass ratios of bentonite and fine sand (B:S) were subsequently tested using the medium and coarse sand (Series 2). The results show that for Series 1, a thin filter cake (<0.1 mm after drying) with extremely low permeability (similar to 10(-8) m/s) was formed only when the fine sand was used. The filter cake consisted of layers of dense bentonite platelets arranged perpendicular to the infiltration direction. Similar results were obtained for Series 2 between the medium and coarse sand. Within the range of 1:1.5 <= B:S <= 1:0.5, the low permeable filter cake was formed on the deposited layer of fine sand and bentonite platelet. Contrary to expectations, adding more sand (B:S = 1:2) did not complete the formation of filter cake, and instead led to continuous deposition of fine sand and bentonite platelet, which may cause inadequate effective face support during slurry shield tunneling.}},
  articleno    = {{100963}},
  author       = {{Qin, Su and Xu, Tao and Zhou, Wan-Huan and Bezuijen, Adam}},
  issn         = {{2214-3912}},
  journal      = {{TRANSPORTATION GEOTECHNICS}},
  keywords     = {{Geotechnical Engineering and Engineering Geology,Transportation,Civil and Structural Engineering,Filter cake,Infiltration behaviour,Fine sand,Bentonite platelet,Tunneling,SHIELD,SUSPENSIONS,STABILITY,PRESSURE}},
  language     = {{eng}},
  pages        = {{13}},
  title        = {{Infiltration behaviour and microstructure of filter cake from sand-modified bentonite slurry}},
  url          = {{http://doi.org/10.1016/j.trgeo.2023.100963}},
  volume       = {{40}},
  year         = {{2023}},
}

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