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충남대학교

충남대학교 건설재료시공학연구실

Building material & construction lab.

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국외학술발표

사수이, 김규용, 이상규, 황의철, 손민재, 남정수 (2019), Sodium Hydroxide and Sodium Silicate Activated Glass Powder- GGBS Blended Geopolymer Mortar, SBE19 SEOUL International Conference on Sustainable Built Environment
사수이, 김규용, 이상규, 황의철, 손민재, 남정수 (2019), Sodium Hydroxide and Sodium Silicate Activated Glass Powder- GGBS Blended Geopolymer Mortar, SBE19 SEOUL International Conference on Sustainable Built Environment
작성자 관리자
조회수 206 등록일 2019.12.12
주저자 사수이
교신저자 042-821-7731
공동저자 이상규, 황의철, 손민재, 남정수
학술지명 SBE19 SEOUL International Conference on Sustainable Built Environment
ABSTRACT
This paper explored the compressive strength and microstructure of geopolymer mortar synthesized by
replacing 0% to 50% ground granulated blast-furnace slag (GGBS) with Glass powder (GP). The
effects of two different activators i.e NaOH and NaOH + Na2SiO3 on the strength, porosity and
microstructure of GP-GGBS blends was also studied. NaOH of 4 molarity, NaOH (4M) +
Na2SiO3 mixed at Na2SiO3 / NaOH ratio of 1.5, liquid to solid ratio of 0.4, 4 hours paste
mixing, 60 oC heat curing for 24 hours and 28 days aging are the parameters set for this study.
Results revealed improved strength, reduced porosity and compact microstructure for the samples
containing GP up to 30% activated in NaOH+Na2SiO3 solution. The NaOH activated samples on the
other hand leads to the strength loss and loose matrix with increasing GP content. SEM micrographs
further revealed the fact that GP was partially dissolved in NaOH+Na2SiO3 as few unreactive
glass particles were exhibited, which were compactly embedded in a paste containing 30%
GP. With increasing GP above 30%, the unreactive GP particles increases leading to strength
loss and development of loose matrix. This suggest that the glass is less reactive in NaOH 4M
solution but the incorporation of sodium silicate in NaOH 4M can enhance its reactivity.