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J. Korean Ceram. Soc. > Volume 39(5); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(5): 452.
doi: https://doi.org/10.4191/kcers.2002.39.5.452
콘크리트 혼합재의 석회반응성에 관하여
장복기, 윤정한1
전남대학교 신소재공학부
1전남대학교 자원공학과
A Study on the Lime Reactivity of Concrete Admixtures
Pok-Kie Chang, Chung-Han Yoon1
Department of Materials Science and Engineering, Chonnam National University
1Department of Mineral and Energy Engineering, Chonnam National University
This paper addresses the hydrothermal reactivity of blast furnace slag and fly ash with lime, respectively. The test conditions were CaO-to-$SiO_2$ ratio (C/S), autoclaving temperature ($140{circ}C$ and $180{circ}C$) and time (20 to 60h). The study was carried out in terms of the hydrothermal reactivity between $SiO_2$ contained in each hydraulic material and (pure) lime and the compressive strength of autoclaved specimens. Porosity measurement and the XRD analysis were also made in order to ascertain the hydraulicity of the siliceous materials. Compressive strength of the specimens was interpreted in terms of porosity and the reactivity of CaO and $SiO_2$. And the XRD analysis showed the C/S change of the hydrates in the course of autoclaving process. $SiO_2$ in the blast furnace slag was more reactive with CaO than that in the fly ash and consequently the blast furnace slag specimens resulted in much higher compressive strength. A maximum compressive strength of $807kg/cm^2$ was obtained for the blast furnace slag at the autoclaving condition of $180{circ}C$ and 40 h, while only $397kg/cm^2$ was maximally to achieve with fly ash.
Key words: Blast furnace slag, Fly ash, Hydrothermal reactivity, Compressive strength
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