실리카흄 및 석고 혼입에 따른 천연수경성석회의 수화특성
Hydration Characteristics of Natural Hydraulic Lime Depending on Silica Fume and Anhydrite Replacement
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본 연구에서는 무기질 첨가재인 실리카 흄과 석고 첨가에 따른 천연수경성석회 (NHL)의 수화특성에 대해연구를 수행하였다. 연구에서 사용된 천연수경성석회는 국내 저품위 석회석을 활용하여 제조하였다. 천연수경성석회 페이스트의 수화특성은 무기질 첨가재의 혼합비 및 수화시간에 따라 조사되었다. 또한, EU 규격에 의한 방법으로모르타르를 제작하여 압축강도 측정을 실시하였다. 실리카 흄과 석고를 혼합하여 제조한 천연수경성석회 페이스트의 수화특성분석결과 실리카 흄과 Ca(OH)2와의 반응에 의해 생성된 칼슘실리케이트 수화물 및 Ca(OH)2의 탄산화반응에 의한 CaCO3가 관찰되었다. 석고 혼합에 따라 칼슘실리케이트 수화물 생성은 다소 지연되었으나 CaCO3가 더 많이 생성되었다. 압축강도 분석결과 실리카 흄 첨가에 따라 압축강도는 증가하였으며 적정 혼입율은 20% 정도였다. 석고 첨가에 따라 재령 7일부터 압축강도가 증가하여 재령 28일에서 최대 10.2 MPa까지 상승하였다.
Abstract
In the present study, the effects of adding a inorganic admixture such as silica fume (SF) and anhydrite to natural hydraulic lime (NHL) on hydration properties were systematically investigated. NHL was produced using domestic low-grade limestone. The hydration properties of NHL pastes were then investigated as a function of the hydration time and mixing ratio of mineral admixture. Through an investigation of the hydration properties of NHL pastes mixed with SF and anhydrite, C-S-H compounds and CaCO3 were observed. According to adding anhydrite, the formation of C-S-H hydrates was slightly delayed, but CaCO3 was created more than other specimen. The compressive strength was increased by the mixing of the silica fume, and optimum mixing ratio was about 20%. The compressive strength was increased more higher than other mortars from curing 7 days by addition of anhydrite, it was increased to maximum 10.2 MPa at 28 days.
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