Mechanical Properties of High Strength Cement Composite with Carbon Fiber

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J. Korean Ceram. Soc. > Volume 30(2); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(2): 139.

탄소섬유 보강 고강도 시멘트 복합체의 기게적 특성에 관한 연구

전용희, 한기성

인하대학교 무기재료과

Mechanical Properties of High Strength Cement Composite with Carbon Fiber

ABSTRACT

Two sheets of high strength cement paste using ordinary Portland cement and water soluble polymer (polyacrylamide) were made by kneading with a twin roll mill. A carbon fiber layer out between two sheet of the cement paste, and then carbon fiber reinforced high strength cement composites were prepared by pressing them. The mechanical properties of the composites were investigated through the observation of the microstructure and the application of fracture mechanics. When the carbon fiber was added with 0.2 and 0.3wt% to the composites the flexural strength and Young's modulus were about 110∼116MPa and 74∼77GPa respectively, and critical stress intensity was about 3.14MPam1/2. It can be considered that the strength improvement of high strength cement fiber composites may be due to the removal of macropores and the increase of various fracture toughness effects; grain bridging, frictional interlocking, polymer fibril bridging and fiber bridging.