| Summary: | 碩士 === 朝陽科技大學 === 營建工程系碩士班 === 91 === Taiwan is located in the Pacific earthquake region, not only the frequency is very high, but the weather here hot and humid, changeful the weather, cracks or damage of concrete members will occur as a result of a number of internal and external factors in concrete structures, the safety of building deeply affected by it.
In this study, reactive powder concrete（RPC）is used to investigate the durability of strengthening concrete members. In the first place, testing for mechanical properties of RPC. Secondly, evaluate the durability of RPC by accelerating carbonation test and seawater dry-wet cycle acceleration deterioration test. The test included compression strength, bending strength, slant shear strength, splitting tensile strength, pull out strength, ultrasonic wave propagation velocity measurement, abrasion test, chloride ion penetration test, carbonated depth measurement, X-ray, and SEM observation etc. In the last of this thesis, two different materials are evaluated with their reinforced effect and cost. It is expected that this studies and tests will be helpful to the strengthening of the damaged building structures.
The test results show that the mechanical properties of reactive powder concrete possess high strength, toughness, and abrasion resistance. At the accelerated carbonation test, no carbonation could be detected on reactive powder concrete samples. After seawater dry-wet cycle test exposures, there is no influence on strength and microstructure. The RPC displays excellent durability and penetration resistance. Using RPC and carbon fiber reinforcement polymers （CFRP） on strengthening concrete members could be obtain excellent retrofit effects, but their material costs are extremely different.
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