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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 |
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| ABSTRACT |
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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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