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J. Korean Ceram. Soc. > Volume 38(9); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(9): 811.
점토/소각재/첨가제계 인공 경량골재의 발포기구
권용준, 김유택, 이기강, 김영진, 강승구, 김정환, 박명식
경기대학교 재료공학과
Lightweight Aggregate Bloating Mechanism of Clay/Incinerated Ash/Additive System
Yong-Joon Kwon, Yoo-Taek Kim, Ki-Gang Lee, Young-Jin Kim, Seung-Gu Kang, Jung-Hwan Kim, Myoung-Sik Park
Department of Materials Engineering, Kyonggi University
The influence of the incinerated ash and additives on glass phase formation of lightweight aggregate, weight-lightening, and the bloating mechanism was investigated. Clay was used as base materials and incinerated ash was added from 0 to 30wt%. The additives such as $Na_2CO_3,;CaCo_3,;K_2CO_3,;MgCO_3$, and a little amount of waste oil were added to the mixed body. In clay/incinerated ash/additive system, it turned out that $CaCO_3;and;MgCO_3$ were the components for glass phase formation and $Na_2CO_3$ was the component for both glass phase formation and weight-lightening. The small addition of waste oil from 0.5wt% to 3.0wt% affect on the bloating of aggregate. Incinerated ash had a good effect on the glass phase controlling. The most effective condition controlling glass phase and bloating of aggregate was 10wt% incinerated ash, 2wt% waste oil at 1200$^{circ}$C. The bloating mechanism of lightweight aggregate is as follows; 1) micro-crack formation caused by thermal-shock and gas generation from inside of aggregate, 2) volume expansion by glass phase formation on the aggregate surface and rapid gas bloating inside of aggregate, 3) densification after bloating.
Key words: Lightweight aggregate, Bloating, Glass phase, Incinerated ash
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