| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 100 === Slag, which is a by-product of manufacturing steels, can be first alkali-activated and then used as a replacement of portland cement in the production of concrete bricks. In the study, concrete bricks with various design mixtures of sand content, aggregate/binder ratio, water/binder ratio and alkali content were made. It is found that the 7-day compressive strength of high-strength bricks can be up to 70.51MPa, higher than that as requested by Class A standard of CNS13295. Also, the 7-day compressive strength of permeable bricks reaches 36.81MPa while their coefficient of permeability is 0.104cm/sec; both are higher than the standard values as requested by CNS14995. The amount of binder slurry plays an important role in determining the permeability coefficient of permeable bricks; in other words, the permeability coefficient of a permeable brick with a lower water/binder ratio but a higher aggregate/binder ratio is larger. When only the cost of materials is considered, the cost is NT$ for high-strength bricks and NT$ for permeable bricks as compared to NT$ for commercially available bricks. The 28-day compressive strength of high-strength bricks made in a factory is 78.51MPa, still higher than Class A standard of CNS13295. The 28-day compressive strength of permeable bricks made in a factory is 35.89MPa and their permeability coefficient is 0.125cm/sec; both satisfy the standards of CNS14995.
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