| Summary: | 碩士 === 國立聯合大學 === 土木與防災工程學系碩士班 === 100 === This study is using the sludge, a by-product of light emitting diode (LED) manufacturing process. We selected three kinds of water to cementitious ratio (w/c = 0.5, 0.6, and 0.7) to replace partial cement in cement-concrete. Such LED sludge powder replaced 0, 5, 10, and 20 wt.% of the cement to form the sludge-blended cement concrete (SBCC) specimens. These molded 10 cm in diameter and 20 cm in height cylindrical specimens were for setting time test, unit weight test, compressive strength test, stress-strain test elastic modulous measurement ultrasonic pulse velocity Measurement measurement and mass growth measurement, and other engineering properties test. The properties of LED sludge sample were checked by scanning electron microscope/energy dispersive x-ray spectrometry (SEM/EDS) analysis and x-ray diffraction (XRD) analysis. The experimental test reveals that the compressive strength of SBCC specimens are comparable to the ordinary Portland cement concrete (OPCC) specimens in all curing age, the other engineering properties were similar. Hence, the LED sludge can be converted to a useful resource by exempting the difficulty of disposal problems and appeal to the environmental sustainability.
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