| Summary: | 博士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === As compared to Portland cement, inorganic polymers are low energy-consumption and have excellent physical and chemical properties. But, the raw materials of inorganic polymers are expensive and thus limit their applications as construction and building materials. The reservoir sludge in Taiwan is mainly composed of aluminum-silicates. Also, container glass and TFT-LCD glass contain a high level of SiO2. The feasibility of using waste reservoir sludge, container glass and TFT-LCD glass as raw materials of inorganic polymers is evaluated here. In the study, the three waste materials were alkali-activated by using adequate alkaline activating solution to reduce the cost for the production of inorganic polymers.
Experimental results indicate that the optimum calcination temperature of reservoir sludge is 850℃ for lasting 6 hours to enhance their chemical reactivity and thus to replace the raw material of metakaolin. The reservoir sludge-based geopolymer have good workability and compressive strength. Under the same workability, the required water content for reservoir sludge-based geopolymer binders is lower as compared to Portland cement. Hence, the water/cement ratio can be further reduced to improve the compressive strength of reservoir sludge-based geopolymer binders.
Container glass can be alkali-activated by using an aging process at higher temperatures. Even without the addition of sodium silicate in alkaline activating solution, larger amounts of silicate ions can still be dissolved for the subsequent polycondensation reaction, leading to a high compressive strength glass-based geopolymer binder. For example, the compressive strength of the glass-based geopolymer binder can be up to 115MPa when the equivalent alkaline content 3% and aging process are used. Meanwhile, the effect of different types of glass on the color and compressive strength of waste glass-based geopolymer binders is found to be insignificant. At the same time, TFT-LCD glass used as a raw material of inorganic polymers can be alkali-activated by using a similar aging process. The compressive strength of TFT-LCD-based geopolymer binder can reach 64.3MPa. It is also found the binding between TFT-LCD-based geopolymer binder and aggregates is strong. Moreover, the physical properties of LCD-based geopolymer binders are consistently better than those of pure glass-based geopolymer binders.
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