Mechanical properties of geopolymers after immersion
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Herein, the variation in the mechanical properties of lightweight geopolymers, which contain integrated gasification combinedcycle slag and Si sludge, were investigated by varying the curing conditions and introducing an additional drying process afterimmersion. The changes in the compressive strength and dentable characteristics were monitored for various samplescorresponding to different curing conditions, immersion periods, and an optional post-immersion drying process. Themicroscopic morphology of the geopolymers was observed before and after immersion to investigate the enhancement in themechanical properties of the geopolymers. The oven-cured specimens exhibited dentable characteristics, whereas theautoclaved specimens exhibited abrupt breakdown characteristics without any dentable characteristics. Further, the dentablecharacteristics observed in the specimens immersed for 3 days disappeared when the specimens were immersed for 7 days. The autoclaved specimens showed little difference in the compressive strength profile after 3 and 7 days of immersion; thisstability in water indicates that the geopolymerization reaction was complete in the autoclaved specimens. In addition, afteran additional oven drying process was used, a substantial increase in the compressive strength (from 4.1 to 7.1 MPa) wasobserved. It is speculated that the additional drying process promotes geopolymerization, which completes the reaction duringthe 1 day process.
Abstract
Herein, the variation in the mechanical properties of lightweight geopolymers, which contain integrated gasification combinedcycle slag and Si sludge, were investigated by varying the curing conditions and introducing an additional drying process afterimmersion. The changes in the compressive strength and dentable characteristics were monitored for various samplescorresponding to different curing conditions, immersion periods, and an optional post-immersion drying process. Themicroscopic morphology of the geopolymers was observed before and after immersion to investigate the enhancement in themechanical properties of the geopolymers. The oven-cured specimens exhibited dentable characteristics, whereas theautoclaved specimens exhibited abrupt breakdown characteristics without any dentable characteristics. Further, the dentablecharacteristics observed in the specimens immersed for 3 days disappeared when the specimens were immersed for 7 days. The autoclaved specimens showed little difference in the compressive strength profile after 3 and 7 days of immersion; thisstability in water indicates that the geopolymerization reaction was complete in the autoclaved specimens. In addition, afteran additional oven drying process was used, a substantial increase in the compressive strength (from 4.1 to 7.1 MPa) wasobserved. It is speculated that the additional drying process promotes geopolymerization, which completes the reaction duringthe 1 day process.
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