알루미나 골재 첨가에 따른 플라이애쉬-고로슬래그계 지오폴리머의 열적특성
Thermal property of geopolymer on fly ash-blast furnace slag system with the addition of alumina aggregate
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본 연구에서는 Alumina 골재를 사용한 fly ash-blast furnace slag계 Geopolymer의 내열성 건축자재로서의 사용가능성을 검토하기 위하여 고온조건에서의 열적 특성에 대하여 조사하였다. 모든 배합조건에서 Geopolymer 경화체의 표면크랙은 800 o C까지는 관찰되지 않았으며, 이것은 열처리 전후 강도의 변화가 작은 것과 일치한다. 또한, 800 o C까지 고로슬래그의 혼합비율이 60 wt%일 때 잔존압축강도가 가장 우수한 것으로 나타났다. Geopolymer 경화체의 주요 수화 생성물은20~35 o (2theta) 범위의 비정질 halo 패턴과 원재료의 mullite(3Al2O3· 2SiO2)와 quartz(SiO2)가 확인되었다. 비정질 halo 패턴은Geopolymer 축중합 반응에 의해서 생성된 aluminosilicate gel이며, 800 o C까지는 aluminosilicate gel의 halo 패턴이 유지되고있음을 알 수 있다. 1,000 o C에서 aluminosilicate gel의 패턴은 사라지며 열처리온도의 증가와 함께 gehlenite, calcium silicate, calcium aluminum oxide, microcline와 같은 결정상이 관찰되었다.
Abstract
In this study, the higher temperature thermal property of the fly ash-blast furnace slag system Geopolymer including alumina aggregate was investigated whether that Geopolymer will be or not useful as thermal-resistant construction materials. Under every mixing conditions, the crack on the surface of hardened body was not observed up to 800 o C and it corresponded with fact that level of changes was not significant before and after heating process. Residual compressive strength is most high when mixing Blast-Furnace Slag ratio is 60 wt% until temperature reaches 800 o C. The major hydrates of hardened body of Geopolymer; amorphous halo pattern between 20~35 o (2theta) and mullite (3Al2O3 · 2SiO2) and quartz (SiO2) was found during the experiment. Amorphous halo pattern was a aluminosilicate gel generated by geopolymeric polycondensation and it was found that the halo pattern of aluminosilicate gel was preserved up to 800 o C. The patterns of aluminosilicate gel disappeared from 1,000 o C and crystal phases like gehlenite, calcium silicate, calcium aluminum oxide, microcline was observed with the increase of exposure temperature.
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