| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 103 === With the rapid progress in the industry in Taiwan, the demand for steels is increasing. The slags as a byproduct of steelmaking are considered as a waste of steels and are usually disposed of by landfill. However, concerning the decreasing fine coarse aggregates in Taiwan and increasing need for environmental protection, if we can know better about the properties of slags and further utilize them, we may be able to save the cost in engineering and energy and increase the social economic benefits. Electric arc furnace slags are the solid byproducts in the process of steelmaking. In developed countries like German and Japan, the utility rate has been above 85% in 2007. Due to the lack of natural aggregates in Taiwan, how to make efficient use of this byproduct material to reduce waste and recycle electric arc furnace slags would be a valuable research direction. Slag is the generated by grinding process of steel blast furnace. Fly ash is made from petrochemical plant. It is also the byproduct of related industry. Both slag and fly ash are the resources could be reused.
This study focuses on the possibilities of substituting electric arc furnace slags for natural aggregates to produce self-compacting concrete. The tests of the study include the Slump mobility,V-funnel flow rate test, Box Test, Setting time test, Compressive strength test substance, Cost-benefit analysis.
The results reveal that the electric arc furnace slags can mostly meet the requirement for producing Self-Compacting Concrete. With the proper grade of slags, appropriate Self-Compacting Concrete can be made, which would even performs better strength and has lower production costs than the natural aggregates. Therefore, we can infer that the electric arc furnace slags can be a substitution for natural aggregates and would not affect the quality of Self-Compacting Concrete and would reduce cost.
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