Research on the Engineering Properties of Geopolymer with Reservoir Sludge

• Main Authors: Han-Sheng Huang, 黃瀚陞
• Other Authors: Yu-Wen Liu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/47724101463339175528

碩士 === 國立嘉義大學 === 土木與水資源工程學系研究所 === 100 === Geopolymer has good mechanical properties and environmental advantages without using Portland cement. In the research, the fly ash and granulated slag are used to produce geopolymer mortar and concrete respectively. Meanwhile, reservoir sludge are used to replace the fine aggregate within concrete and using different alkali modulus, and then analyzes workability, compressive strength and flexural strength, thermal expansion, unit weight, water absorption, sulphate resistance, chloride ion penetration resistance and microcosmic and other engineering properties. At the same time, the possibility of reservoir sludge in the engineering application is discussed to provide application reference for relevant units. Research results show that if the higher the amount of fine aggregate replaced by the reservoir sludge is, the longer the setting time of geopolymer mortar and concrete is and the lower the compressive strength, impact resistance and thermal expansion coefficient and unit weight are lower. The flexural strength can reach the highest value if the replacement amount of sludge is 10%; the results show that adding a small amount of reservoir sludge can improve the brittle nature of geopolymerization. However, the chloride ion penetration coefficient decreases while the sludge replacement is increased, and the weight loss rate of sulfate increases while replacement amount of sludge is increased. Therefore, after the geopolymer mortar and concrete are added with reservoir sludge, their durability will be reduced accordingly. In addition, it can seen from the results of microscopic test that after the geopolymer mortar is added with sludge, the (SiO4)4- and (AlO4)5- are react incomplete, and the organizational structure is loose. On the other hand, when the alkali modulus increases, the liquidity of geopolymer mortar is reduced, the setting time is shortened, and the response rate is faster, etc. When the alkali modulus of geopolymer mortar and concrete is 1.25, the highest compression strength can be obtained. The flexural strength is highest when the alkali modulus is 1.25, and it is the smallest when the alkali modulus is 1.0. The coefficient of thermal expansion is the highest when the alkali modulus is 1.25, and it is the smallest when the alkali modulus is 1.5. As for the abrasion resistance property of geopolymer concrete, it is the best when the alkali modulus is 1.25 and it is the worst when the alkali modulus is 1.0.