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시멘트계 결합재가 적용된 지오텍스타일의 접촉면 전단강도 평가
손동건 ( Son Dong-geon ),변용훈 ( Byun Yong-hoon ) 한국농공학회 2022 한국농공학회논문집 Vol.64 No.1
Multi-layered geotextile tubes may have problems on its stability when used as cofferdam. This study presents the shear strength characteristics at the interface between geotextiles and a cementitious binder material to improve the stability of the multi-layered geotextile tubes. In this study, two different types of geotextiles are used. After mixing with a rapid setting cement, fly ash, sand, accelerator, and water, the cementitious binder material is prepared at the interface between two geotextile samples and cured under water for a desired period. The specimen is placed on upper and lower direct shear boxes by using clamping systems. A series of direct shear tests for two different geotextiles are performed along the curing time under three vertical stresses. Experimental results show that the shear strength at the interface between the cementitious binder material and geotextiles is greater than that at the interface between two geotextiles. For two types of geotextiles, apparent cohesion occurs at the interface between the cementitious binder material and geotextiles. In addition, the friction angles for any curing time are improved, compared to the interface between two geotextiles. The cementitious binder material suggested for the interface between two geotextiles may be useful for the reinforcement of multi-layered geotextile tubes.
쿼드리올라쿤레바바툰데 ( Quadri Olakunle Babatunde ),손동건 ( Dong Geon Son ),허윤검 ( Yoon Geom Heo ),변용훈 ( Yong-hoon Byun ) 한국농공학회 2022 한국농공학회 학술대회초록집 Vol.2022 No.-
Soil erosion has a significant influence on agricultural sustainability, resulting in critical economic, environmental and engineering challenges. This study presents the improvement of soil internal erosion using a novel zein biopolymer binder. In this study, cohesionless soils which are susceptible to erosion are considered as a specimen. A comparative test is conducted on untreated and treated soil specimens prepared using a 1 % mass of zein biopolymer binder. Specimens are compacted in an acrylic transparent mold with a 6 mm predrilled axial hole. Soil specimens are subjected to a hole erosion test at a constant hydraulic gradient and flow rate after curing for predetermined periods. The experimental results show that erosion occurs rapidly in an untreated specimen, resulting in total soil collapse. The application of zein biopolymer binder significantly improves the erosion resistance of the treated specimen. The erosion rate of the treated specimen decreases with increasing curing period. Based on the experimental result, zein biopolymer is suggested as a potential binder to mitigate soil erosion.