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http://dx.doi.org/10.6111/JKCGCT.2017.27.6.295

Effects of pre-curing process on improvement of the compressive strength of IGCC-slag-based-geopolymer  

Park, Soo-bin (Department of Advanced Material Engineering, Kyonggi University)
Kim, Kang-duk (Department of Advanced Material Engineering, Kyonggi University)
Kang, Seung-gu (Department of Advanced Material Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.27, no.6, 2017 , pp. 295-302 More about this Journal
Abstract
In this study, the effect of pre-curing process on the enhancement of mechanical properties of IGCC-slag-based-geopolymer was studied. Pre-curing is a process in which the green geopolymer is left at room temperature for a certain period of time prior to the high-temperature curing, and it is known as increasing the strength of a specimen. Therefore, in this experiment, the compressive strength of the geopolymers was measured according to various pre-curing conditions, and microstructure and crystal phase changes were observed by SEM and XRD, respectively. The W/S ratio was determined to be 0.26, which can offer the maximum geopolymer strength with easy molding ability, and the concentration of the alkali solution was 15 M. Pre-curing was performed at room temperature for 0 to 27 days. Compressive strength of the geopolymer made with pre-curing process increased by 36~87 % compared with the specimens made with no pre-curing process. Those improved compressive strength for the pre-cured geopolymer was confirmed owing to promotion effect of pre-curing process on generation of C-S-H gel and zeolite phases, which were analyzed using by XRD and SEM measurement.
Keywords
IGCC slag; Geopolymer; Pre-curing; Compressive strength; Aging time;
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Times Cited By KSCI : 4  (Citation Analysis)
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