| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 107 === Fiber reinforced cementitious materials are used to promote the strength and the toughness of structure in the engineering. This paper aimed to investigate the mechanical behaviour of fiber reinforced cementitious materials, which added various weight ratio and length of short carbon fiber, under compressive, flexural and impact testing. It was found that the high-early-strength cement had the best compressive strength as the carbon fiber weight ratio of 12.5 ‰. Increasing the carbon fiber weight ratio continuously caused the workability and the strength decreased. It was found that the high-early-strength mortar had the best compressive strength as the carbon fiber weight ratio of 12 ‰ while the best flexural strength as the carbon fiber weight ratio of 15 ‰. Additionally, analyzing micromechanics by Mori-Tanaka estimate to obtain the modulus of fiber reinforced cementitious composites. Furthermore, this study utilized the physical and chemical process to remove silane, and then adopted pneumatic process to disperse short carbon fiber. It was found that the method using high-temperature to remove silane is better and the strength of fiber-reinforced specimens increased about 14 % for early age.
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