| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 104 === This study, based on the industrial waste, Ladle Furnace Slag (LFS), employed an alkali-activated technology to activate LFS. LFS was prepared different alkali modulus ratio (SiO2 /Na2O) 0.75,1.0,1.25 and different Liquid/Solid ratios (L/S) of 0.35, 0.40 and 0.45 and with different alkali agents of 4%, 6% and 8%. The LFS receives curing in various curing conditions (air and saturated limewater) to evaluate the mixture and engineering properties of LFS at different ages. The results show that the workability of the LFS geopolymer increased with an increasing L/S ratio and alkali agent. Moreover, the compressive strength and ultrasonic velocity increased with an increase in the alkali agent and a decrease in L/S ratio, but the weight loss was reduced. Therefore, the appropriate use of alkali-activated technology can activate LFS, thereby enhancing its engineering properties. Curing in saturated limewater can greatly improve the engineering properties of the geopolymer compared to air curing. Specifically, the compressive strength of LFS increases by 1.0-2.56 times. The ultrasonic velocity of LFS increases by 0.12-18.94%. The thermal conductivity increases by 0.017-0.175W/m･K, and the overall shrinkage of LFS cured in the saturated limewater ranges between 0.0012% and 0.0388%, which is far lower than samples cured in air, thus indicating that curing in saturated limewater can effectively prevent LFS shrinkage.
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