Collapse rate enhancement of lightweight geopolymer by extra-mixing during the bloating process
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Integrated gasification combined cycle (IGCC) slag and Si sludge, classified as general waste, were used as raw materials formaking geopolymers. Geopolymers containing Si sludge have lightweight characteristics; however, they can easily collapseduring the bloating process because of the formation of explosive hydrogen gas through the reaction between Si and thealkaline activator. Several methods, such as controlling the concentration of the alkaline activator, curing temperature, andmixing time, have been attempted, and the relationship between these parameters and the collapse rate has been investigated. Providing extra heat to the specimen during the bloating process would be an effective way to prevent collapse; however, itwould not be economical because an additional cost would be required for extra heating during the bloating process. It wasspeculated that the most effective and economical way of preventing collapse or enhancing the collapse rate would be to supplyextra mixing time during the bloating process. The optimum mixing time must be estimated under each set of geopolymermanufacturing conditions. A homogeneous and small-sized pore distribution could be obtained in the geopolymer matrix byproviding extra mixing time during the bloating process.
Abstract
Integrated gasification combined cycle (IGCC) slag and Si sludge, classified as general waste, were used as raw materials formaking geopolymers. Geopolymers containing Si sludge have lightweight characteristics; however, they can easily collapseduring the bloating process because of the formation of explosive hydrogen gas through the reaction between Si and thealkaline activator. Several methods, such as controlling the concentration of the alkaline activator, curing temperature, andmixing time, have been attempted, and the relationship between these parameters and the collapse rate has been investigated. Providing extra heat to the specimen during the bloating process would be an effective way to prevent collapse; however, itwould not be economical because an additional cost would be required for extra heating during the bloating process. It wasspeculated that the most effective and economical way of preventing collapse or enhancing the collapse rate would be to supplyextra mixing time during the bloating process. The optimum mixing time must be estimated under each set of geopolymermanufacturing conditions. A homogeneous and small-sized pore distribution could be obtained in the geopolymer matrix byproviding extra mixing time during the bloating process.
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