Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydraulic conductivity and compressibility of polyanionic cellulose-modified sand-calcium bentonite slurry trench cutoff wall materials
https://orcid.org/http://orcid.org/0000-0002-2811-8006
In some countries lacking sodium bentonite (NaB), polymer-modified calcium bentonite (CaB) has attracted attention for its application in sand-bentonite slurry trench cutoff walls to control groundwater contamination. Thus, this study used polyanionic cellulose (PAC), an environmentally friendly hydrophilic polymer, to modify CaB. The hydraulic and consolidation properties of cutoff-wall materials (including bentonite cake and backfill) containing CaB or modified CaB with 4% PAC (dry mass ratio, 4%PAC-CaB) under various stress conditions, CaCl2 solution concentrations, and bentonite contents were investigated through a series of experiments, including modified fluid loss, slump, Atterberg limit, oedometer, and rigid-wall hydraulic conductivity tests. The results show that the 4%PAC-CaB cake had better salt resistance and impermeability than CaB and NaB cakes under different stress and salt concentration conditions, and sand-4%PAC-CaB backfill had a significantly higher liquid limit, ideal water content, and compression index, and a lower coefficient of consolidation and permeability than sand-CaB backfill with the same bentonite content. More importantly, the addition of 4% PAC had a more significant effect on decreasing the permeability of the sand-CaB backfill than increasing the CaB content. Overall, 4%PAC-CaB is a promising modified CaB that can replace NaB for the construction of cutoff walls with excellent impermeability.
Hydraulic conductivity and compressibility of polyanionic cellulose-modified sand-calcium bentonite slurry trench cutoff wall materials
https://orcid.org/http://orcid.org/0000-0002-2811-8006
In some countries lacking sodium bentonite (NaB), polymer-modified calcium bentonite (CaB) has attracted attention for its application in sand-bentonite slurry trench cutoff walls to control groundwater contamination. Thus, this study used polyanionic cellulose (PAC), an environmentally friendly hydrophilic polymer, to modify CaB. The hydraulic and consolidation properties of cutoff-wall materials (including bentonite cake and backfill) containing CaB or modified CaB with 4% PAC (dry mass ratio, 4%PAC-CaB) under various stress conditions, CaCl2 solution concentrations, and bentonite contents were investigated through a series of experiments, including modified fluid loss, slump, Atterberg limit, oedometer, and rigid-wall hydraulic conductivity tests. The results show that the 4%PAC-CaB cake had better salt resistance and impermeability than CaB and NaB cakes under different stress and salt concentration conditions, and sand-4%PAC-CaB backfill had a significantly higher liquid limit, ideal water content, and compression index, and a lower coefficient of consolidation and permeability than sand-CaB backfill with the same bentonite content. More importantly, the addition of 4% PAC had a more significant effect on decreasing the permeability of the sand-CaB backfill than increasing the CaB content. Overall, 4%PAC-CaB is a promising modified CaB that can replace NaB for the construction of cutoff walls with excellent impermeability.
Hydraulic conductivity and compressibility of polyanionic cellulose-modified sand-calcium bentonite slurry trench cutoff wall materials
https://orcid.org/http://orcid.org/0000-0002-2811-8006
In some countries lacking sodium bentonite (NaB), polymer-modified calcium bentonite (CaB) has attracted attention for its application in sand-bentonite slurry trench cutoff walls to control groundwater contamination. Thus, this study used polyanionic cellulose (PAC), an environmentally friendly hydrophilic polymer, to modify CaB. The hydraulic and consolidation properties of cutoff-wall materials (including bentonite cake and backfill) containing CaB or modified CaB with 4% PAC (dry mass ratio, 4%PAC-CaB) under various stress conditions, CaCl2 solution concentrations, and bentonite contents were investigated through a series of experiments, including modified fluid loss, slump, Atterberg limit, oedometer, and rigid-wall hydraulic conductivity tests. The results show that the 4%PAC-CaB cake had better salt resistance and impermeability than CaB and NaB cakes under different stress and salt concentration conditions, and sand-4%PAC-CaB backfill had a significantly higher liquid limit, ideal water content, and compression index, and a lower coefficient of consolidation and permeability than sand-CaB backfill with the same bentonite content. More importantly, the addition of 4% PAC had a more significant effect on decreasing the permeability of the sand-CaB backfill than increasing the CaB content. Overall, 4%PAC-CaB is a promising modified CaB that can replace NaB for the construction of cutoff walls with excellent impermeability.
Hydraulic conductivity and compressibility of polyanionic cellulose-modified sand-calcium bentonite slurry trench cutoff wall materials
Acta Geotech.
Shi, Fu-Jiang (Autor:in) / Feng, Shi-Jin (Autor:in) / Zheng, Qi-Teng (Autor:in) / Peng, Chun-Hui (Autor:in)
Acta Geotechnica ; 19 ; 5503-5515
01.08.2024
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Backfill , Calcium bentonite , Compressibility , Cutoff wall , Hydraulic conductivity , Polyanionic cellulose Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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