| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 106 === In order to enhance the relevant properties of cement materials, carbon fiber was added to the cement in a gradual manner. In the past, the main purpose of adding fiber was to reduce drying shrinkage and control cracks. However, this study focuses on the compressive strength, flexural strength and impact resistance of carbon fiber concrete, and observes the behavior of the damaged material in a microscopic manner. In this study, 5~20 ‰ (weight ratio) addition amount; length 3~24 mm length carbon fiber is added for various mechanical tests.This study found that the amount of fiber added has the best strength performance at 15 to 20 ‰. The continuous increase in the amount of added carbon fiber leads to a decrease in the strength and fluidity of the cement. An impact test showed that the addition of short fiber specimens allows it to withstand 82 to 141 joules of energy.The compressive strength (early strength) of the fiber concrete specimens was lower than that of the carbon fiber cement, and its flexural strength was about 3 MPa. It was judged that the fiber strength is higher than the strength of the aggregates, which could not significantly increase the strength of the specimens, but it was still better than that of the sample without fiber. Microscopic observations of the destruction of the material’s surface were noted, and influencing factors include fiber slippage and breakage.
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