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Improvement of Sand-Geotextile Interface Characteristics by Biocementation Processes
https://orcid.org/http://orcid.org/0000-0002-9579-5496
In geosynthetic reinforced soil structures, the soil-geotextile interfacial shear strength is governed by adhesion and friction between the soil and geotextile. Conventionally, higher frictional materials, cement, and chemically treated geosynthetics are employed to improve the interfacial shear strength. The current study evaluates the effectiveness of microbially cemented sand geotextile interface and enzymatically cemented sand geotextile interface, which are potentially more sustainable. The modified direct shear test was conducted on the biocemented interface specimens treated for different numbers of cycles and those prepared at different relative densities. It was observed that the interfacial shear strength readily improved at higher treatment cycles and relative densities. With biocementation, the improvement in interfacial adhesion and friction was from 33.5 to 393% and 14 to 51%, respectively, depending on the calcium carbonate precipitation content, precipitation sites, and density. In the enzymatically cemented sand geotextile interface prepared at 95% density and treated for 6 cycles, the geotextile failed in tension mobilizing the maximum interfacial shear strength, which is an appealing success of the treatment method. The processes developed at different conditions of density, calcite content, and normal stresses have been enumerated to develop a better understanding of the mechanics of interface improvement.
Improvement of Sand-Geotextile Interface Characteristics by Biocementation Processes
https://orcid.org/http://orcid.org/0000-0002-9579-5496
In geosynthetic reinforced soil structures, the soil-geotextile interfacial shear strength is governed by adhesion and friction between the soil and geotextile. Conventionally, higher frictional materials, cement, and chemically treated geosynthetics are employed to improve the interfacial shear strength. The current study evaluates the effectiveness of microbially cemented sand geotextile interface and enzymatically cemented sand geotextile interface, which are potentially more sustainable. The modified direct shear test was conducted on the biocemented interface specimens treated for different numbers of cycles and those prepared at different relative densities. It was observed that the interfacial shear strength readily improved at higher treatment cycles and relative densities. With biocementation, the improvement in interfacial adhesion and friction was from 33.5 to 393% and 14 to 51%, respectively, depending on the calcium carbonate precipitation content, precipitation sites, and density. In the enzymatically cemented sand geotextile interface prepared at 95% density and treated for 6 cycles, the geotextile failed in tension mobilizing the maximum interfacial shear strength, which is an appealing success of the treatment method. The processes developed at different conditions of density, calcite content, and normal stresses have been enumerated to develop a better understanding of the mechanics of interface improvement.
Improvement of Sand-Geotextile Interface Characteristics by Biocementation Processes
https://orcid.org/http://orcid.org/0000-0002-9579-5496
In geosynthetic reinforced soil structures, the soil-geotextile interfacial shear strength is governed by adhesion and friction between the soil and geotextile. Conventionally, higher frictional materials, cement, and chemically treated geosynthetics are employed to improve the interfacial shear strength. The current study evaluates the effectiveness of microbially cemented sand geotextile interface and enzymatically cemented sand geotextile interface, which are potentially more sustainable. The modified direct shear test was conducted on the biocemented interface specimens treated for different numbers of cycles and those prepared at different relative densities. It was observed that the interfacial shear strength readily improved at higher treatment cycles and relative densities. With biocementation, the improvement in interfacial adhesion and friction was from 33.5 to 393% and 14 to 51%, respectively, depending on the calcium carbonate precipitation content, precipitation sites, and density. In the enzymatically cemented sand geotextile interface prepared at 95% density and treated for 6 cycles, the geotextile failed in tension mobilizing the maximum interfacial shear strength, which is an appealing success of the treatment method. The processes developed at different conditions of density, calcite content, and normal stresses have been enumerated to develop a better understanding of the mechanics of interface improvement.
Improvement of Sand-Geotextile Interface Characteristics by Biocementation Processes
Int. J. of Geosynth. and Ground Eng.
Suresh, Dhanasree (author) / Uday, Kala Venkata (author)
2024-10-01
Article (Journal)
Electronic Resource
English
Improvement of Sand-Geotextile Interface Characteristics by Biocementation Processes
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