| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 91 === In order to protect the living environment on earth, the International Environmental Protection Institutions have become more demanding about the environment since 2000. Besides, the pollution of ozonosphere and the greenhouse effect of the atmospheric layer have worsened the damage of ultraviolet and impact of global warming resulting in worldwide climate change. Therefore, ISO 14000, the quality assurance and environmental management standard, will be the main pursuit of the businesses. Regarding the concrete, to produce 1 kg cement will exhaust 1 m3 CO2. Because cement is energy- consuming and air- polluted material, how to reduce the use of cement has a great meaning to environment. Additional concern of earth ecology is to recycle the discarded materials. According to the official documents, the reduction slag of electric arc furnace, produced during the process of steel smelting, not only has similar chemical property as cement and blast furnace slag but also contains resembling property as Pozzolana material. Hence it acts well as the binding material in concrete. This research is focused on stainless steel slag and carbon steel slag produced in the process of steel smelting during the reduction period of electric arc furnace, and adapts the ecology- concerned Densified Mixture Design Algorithm, concrete design law, to measure the fresh and hardened property, analyze the change of the microstructure, and evaluate the possibility the application to high performance concrete. Results show that the high performance concrete which substitute partial cement to reduction slag are high liquid; the slump can reach more than 230mm and the slump flow will be within 500~700mm.The compressive strength can meet the requirement of design strength at the age of 28 days. Also, the pulse velocity can surpass 4000 m/s, and the category of concrete resistivity is higher than 20kΩ-cm. The measure of MIP porosity decreases as water to binder ratio lowers and the age increase. It is not only with high liquidity and high strength as high performance concrete but also durability. Accordingly, the reduction slag will have similar effects as the blast furnace slag powder applied to high performance concrete.
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