| Summary: | 碩士 === 義守大學 === 土木與生態工程學系 === 106 === As the demand of the steel is increasing, the by-products of steel-making industry are produced greatly. The landfill is not a solution to solve the problems caused by the increasing steel-making by-products. In recent years, to conform to the concept of sustainability and resource recycling, the reuse of these steel-making by-products to the field of engineering is broadly applied. In this study, to study the possible application of the carbon steel oxidizing slags (CSOS) to the pavement engineering, different contents of natural aggregates are replaced by the CSOS in the asphalt concrete (AC) for road pavement.
The 40% of natural aggregates can be replaced by the recycled materials in the engineering application according to the standard set by the Kaohsiung City government. Five different amounts of the CSOS, 0%, 10%, 20%, 30%, and 40% were assigned to replace the natural aggregates in this study. Tests including stability, flowability, unit weight, VMA, VFA, and void ratio are performed to obtain the optimum asphalt content for each of the CSOS replacement. Test results indicate that the asphalt content reduce with the increasing amount of the CSOS replacement and the qualities of the AC are efficiently improved. Moreover, the mechanical tests such as indirect tensile strength, immersion residual tensile strength, resilient modulus, and dynamic and static creep tests are carried out. The test results show that the maximum hardness and best improvement on bearing capacity of the AC are found for the AC with 40% CSOS replacement. During the construction of the pavement, the results obtained from the thermal imaginary analysis show that the heat storing in the AC increases with the increasing amount of the CSOS replacement. Furthermore, the temperature drop in the AC speeds up with the increasing amount of the CSOS replacement. It suggests that the temperature of the rolling compaction during the construction has to be well aware. To evaluate the durability of the AC with the CSOS replacement, the constant detections by the performance of the rutting, friction, and flatness tests are suggested.
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