| 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 === This work mainly involves the feasibility of repairing Geopolymer and carbon fiber based plastics on the reinforced concrete soffit. Refer to ASTM C109 for compressive test and CNS 14603 contraction test for Geopolymer materials and epoxy resin mortar. Three types of components are prepared, such as reference slab (without any grooves), a rectangular groove slab and a square groove slab. Geopolymer and epoxy resin mortar are used as repairing materials, and carbon fiber reinforced plastics partially used as reinforcing the material. Repair the above repair material in a rectangular groove and a square groove. The carbon fiber reinforced plastics are attached to the soffit of the test piece. Besides, the rectangular groove specimens include: repair with Geopolymer, repair with epoxy resin mortar, repair with Geopolymer and carbon fiber reinforced plastics, and repair with epoxy resin mortar and carbon fiber reinforced plastics. The square groove specimens repair method is similar to the rectangular groove specimens repair method. All test questions are subjected to a four-point bending test with reference to CNS1233 (four-point load method), and a repeated load bending test under different loads is also performed. The achieved results represent that the Geopolymer has higher compressive strength and higher shrinkage; the epoxy resin mortar has lower compressive strength and lower shrinkage. From the results of the four-point bending test, it is found that the test piece of the Geopolymer had a higher bending strength than the test piece repaired by the epoxy resin mortar, and the test piece repaired with the carbon fiber reinforced plastics is higher than the benchmark. The four-point bending test of the repeated load suggests that the specimens reinforced with the carbon fiber reinforced plastics are able to withstand a load of more than 200 times with an ultimate load of 0.8 times which surpasses the benchmark (withstand the load of 7 times with an ultimate load of 0.8 times). Hence, the obtained results suggest that the carbon fiber reinforced plastics plays a dominant role to increase the higher load carrying capacity for several times with excellent reverse load capacity which is suitable for many industrial applications.
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