| Summary: | 碩士 === 正修科技大學 === 營建工程研究所 === 98 === This study is to make use of the treated power plant ash, glass cullet powder, which is combined with mudstone powder, swell and flux etc. after made into lightweight granular aggregate of different sizes through the processes of mixing and rotating granulation. The lightweight aggregate are dried in the shade before drying by oven, and sintered at a temperature increased by 5℃/min. The sintering temperature is set at 800℃, 900℃ and 1000℃, power plant ash is set to 20% and 30%,swell is set to 3% and 3%～15%, flux is set to 3% and 3%～15%, base mechanics features of light weight aggregate through tests of compressive strength, density, water absorption and scanning electron microscopy, with discussion made on the impact of the contents of swell and flux, on the compression strength, density, water absorption, and physical properties.
The sintering temperature in this study is controlled in consideration of energy efficiency and reduction of carbon dioxide emission, and boric acid and calcium carbonate are used as swell, and alumina, iron oxide, sodium bicarbonate as flux to produce an adequate swelling environment to achieve the higher strength and lower density by increasing the viscidity and reducing the swelling temperature.
Experimental results have proven that: (1)the major crystalline compound for materials like power plant ash, mudstone powder and glass cullet, etc. is SiO2, and the minor crystalline compounds of them are Al2O3, Fe2O3, CaO, MgO, K2O and Na2O, which are suitable to be made into lightweight aggregate. (2) if the power plant ash is 20%, when the vesicant adopts boric acid at the fixed content of 3% and that of the fusing agent is 3%~15%, as for the mixture ration of M15-G59-FA20-B3-Al 3～M15-G47-FA20-B3-NaH15, etc., in general, the requirements for green building materials can be met even at the firing temperature of 900°C, where, the mixing intensity of M15-G59-FA20-B3-Al 3 is the highest. (3)if the power plant ash is 20%, when the vesicant adopts boric acid of 3%~15% and that of the fusing agent is fixed at 3%, as for the mixture ration of M15-G59-FA20-B3-Al 3～M15-G47-FA20-B15-NaH3, etc., the requirements for green building materials can be met at the firing temperature of 900°C, where, the mixing intensity of M15-G59-FA20-B3-Al 3 is the highest. (4) if the power plant ash is increased to 30%, when the vesicant adopts boric acid at the fixed content of 3% and that of the fusing agent is 3%~15%, as for the mixture ration of M15-G49-FA30-B3-Al 3～M15-G37-FA30-B3-NaH15, the requirements for green building materials can be met even at the firing temperature of 900°C, where, the mixing intensity of M15-G37-FA30-B3-Fe 15 is the highest. (5) if the power plant ash is increased to 30%, when the vesicant still adopts calcium carbonate is 3%~15% and that of the fusing agent at the fixed content of 3%, as for the mixture ration of M15-G49-FA30-Ca3-Al 3～M15-G37-FA30-Ca15-NaH3, in general, the requirements for green building materials can not be met even at the firing temperature of 1000°C, where, the mixing intensity of M15-G49-FA30-Ca3-Al 3 is the highest. (6) if the content of vesicant is fixed at 3% and that of the fusing agent is 3%~15%, when the content of power plant ash is 20%, the compression strength and density are high, but water absorption is low; when boric acid is adopted as the vesicant, the intensity is high, the density and water absorption are low more significant, however, the dosage shall not exceed 9%.
Keywords: Power Plant Ash, Glass Cullet Powder, Mudstone Powder, Swell, Flux, Rotating Granulation.
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