| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 107 === In recent years , in order to save cement consumption,the construction industry will replace cement with pozzolan materials as binder materials in concrete.Pozzolan materials include slag, fly ash, silica fume , depending on the type of material added,concrete will exhibit different characteristics.Pozzolan materials with different sources、chemical compositions、physical feature added into concrete would show big difference in concrete’s performance.Slag is a kind of pozzolan materials, it is a by-product of steel making. When the fineness of slag increases, as result of increase in surface area, the hydration process would become faster than slag with normal fineness. High fineness slag’s microstructural properties and engineering properties are dinstinct from normal pozzolan material added concrete.
Topics of concrete materials are changing from macroscopic engineering properties into microstructural properties. By conducting different kinds of microstructural experiments to understand the mechanism of materials reaction ,hoping by altering properties of materials can achieve target concrete performances.
This research is manily using high fineness slag ,normal fineness slag to replace cement as binder material system,designing three slag replacement ratios with five ages.Conducting three types of microstructural experiments including XRD diffraction ,TG/DTA analysis, MIP and apply these three experiments’ results to compare the differences of microstructural properties between high fineness slag and normal fineness slag after the hydration process.Conducting compressive strength experiment and connect its result with microstructural experiment’s results in order to understand when high fineness slag adds into concrete how microstructural affect engineering properties
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