높은 연성을 갖는 고강도 시멘트계 복합체의 재료강도 및 변형성능
Material Strength and Deformation Performance of Highly Ductile High-Strength Cement Composite
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초록
이 논문의 목적은 다른 종류의 폴리에틸렌 섬유로 보강한 높은 연성을 갖는 고강도 시멘트계 복합체의 재료강도와 인장변형거동을실험적으로 연구하는 것이다. 이를 위하여 압축강도 80 MPa 수준의 재료 및 배합을 결정하였고, 보강 섬유로서 2 종류의 폴리에틸렌 섬유를사용하였다. 그리고 밀도, 압축강도, 1축 인장변형에 대한 일련의 실험을 수행하였다. 실험결과 시멘트계 복합체의 인장거동과 균열 패턴은 보강 섬유의 특성에 크게 영향을 받는 것으로 나타났다. 또한 적절한 폴리에틸렌 섬유를 사용함으로써 재료의 압축강도가 77.7 MPa 이고, 인장변형성능이 7.9% 변형률인 시멘트계 복합체의 제조가 가능하다는 것을 확인하였다.
Abstract
The purpose of this study is to investigate experimentally the material strength and tensile deformation behavior of highly ductilehigh-strength cement composites reinforced by synthetic fibers. Materials and mixture proportions were designed to make composites with a strengthlevel of 80 MPa in compression. Two kinds of polyethylene fibers with different properties were employed as reinforcing fibers. A series of experimentson density, compressive strength, and deformation performance was performed. Experimental results showed that the tensile behavior and crackingpatterns of cement composite strongly depends on the types of reinforcing fibers. It was also demonstrated that the cement composite with a compressivestrength of 77.7 MPa and a tensile strain capacity of 7.9% can be manufactured by using a proper polyethylene fiber.
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