파라계 아라미드섬유 보강 환경친화형 순환골재 콘크리트의 역학적 특성에 관한 연구

초록

Recently, redevelopment and reconstruction projects have caused problems such as depletion of natural aggregates, and the use of recycled aggregate is being reevaluated as an optimal alternative. Therefore, in this study, the mechanical and deformation characteristics of Environment-Friendly Recycled Coarse Aggregate (here after, EFRCA) concrete reinforced with para-aramid fiber with high strength and high elasticity are examined. The experimental main parameters were EFRCA replacement ratio (0, 30 and 50%) and para-aramid fiber volume fraction (0, 0.75 and 1.0%). Experimental results show that the EFRCA concrete has lower compressive strength than plain concrete. However, compared with the natural aggregate, the EFRCA concrete, which exhibited low material properties, showed almost the same performance as plain concrete, such as increased flexural strength and improved ductility by incorporating para-aramid fibers. Through the experiment, it is considered that the most suitable para-aramid volume fraction is 0.75%. Based on these results, the experimental results related to the performance degradation of EFRCA concrete containing para-aramid fibers are secured and basic data for determining the reuse possibility and reinforcement method of structures are presented.

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