| 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 === 102 === This study used different liquid-solid ratios, alkaline solutions and slag to produce pastes. The findings showed that the slump and slump flow of the alkali-activated slag pastes increased with the alkaline solutions and liquid-solid ratio. Without any slow setting additive, the setting rate could be reduced by reducing the alkaline solutions. After different curing ages at high temperatures, residual loi, volume change, compressive strength, ultrasonic pulse velocity and thermal imaging tests were conducted to determine the engineering properties of the different mix design proportions and to determine the optimal mix design proportions. The findings showed that the shear wave velocity, electrical resistivity, ultrasonic pulse velocity and compressive strength of the alkali-activated slag pastes increased with the increase in the alkali-activated solution. The engineering properties declined as the liquid-solid ratio increased, but the workability improved. The increase in the alkaline solutions could enhance the compressive strength at high temperatures; the compressive ength of 0.5% alkali-activated at 500℃ was 30%~50% of that of 1% alkali-activated. The ultrasonic pulse velocity at the high temperature of 500℃ was 2171 m/s~3322 m/s; the ultrasonic pulse velocities of 0.75% and 1% alkali-activated at 800℃ were 2605 m/s and 2812 m/s, respectively, but the ultrasonic pulse velocity of 0.5% alkali-activated 0.5% was only 2211 m/s. The alkaline solutions of 0.75% alkali-activated and 1% alkali-activated were sufficient to finish the polyreaction within a short period of time to afford a material that possessed low porosity and high strength material.
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