Effects of pre-curing process on improvement of the compressive strength of IGCC-slag-based-geopolymer (IGCC 용융 슬래그로 제조된 지오폴리머의 강도증진에 Pre-curing이 미치는 영향)

박수빈; Kangduk Kim (김강덕); KANG SEUNG GU (강승구)

doi:10.6111/JKCGCT.2017.27.6.295

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

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2017, 27(6), pp.295~302
DOI : 10.6111/JKCGCT.2017.27.6.295
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : September 25, 2017
Accepted : October 24, 2017
Published : December 31, 2017

박수빈 ¹, Kangduk Kim ¹, KANG SEUNG GU ¹

¹경기대학교

Accredited

ABSTRACT

In this study, the effect of pre-curing process on the enhancement of mechanical properties of IGCC-slag-basedgeopolymer 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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