| 생석회의 팽창압 발현에 미치는 첨가제 및 양생온도의 영향 |
| 김원기, 소정섭, 김훈상, 김홍주, 이원준, 신진호 |
| 기초소재 주식회사 기술연구소 |
| The Influences of Additives and Curing Temperature on the Expansion Pressure of Calcium Oxide Hydration |
| Won-Ki Kim, Jeong-Soeb Soh, Hoon-Sang Kim, Hong-Joo Kim, Won-Jun Lee, Jin-Ho Shin |
| R&D Center, Basic Materials Corp |
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| ABSTRACT |
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Calcium oxide has been used as a demolition agent in fracturing rocks and old concrete structures, etc. With the agent, demolition work can be done in safety without a noise, vibration and any other pollution, since high expansive pressure is obtained gradually by only mixing the agents with water and pouring the slurry into boreholes. But application of the non-explosive demolition agent is a time-consuming job, especially in winter. Essentially, this problem is related to the reaction rate of calcium oxide with water. This study examines the influence of additives such as cement and anhydrite on expansion pressure of calcium oxide at different curing temperatures. The expansion pressure of calcium oxide began to increase steadily with the rise of the curing temperature. When mixing calcium oxide alone with water, blown-out shot occurred. But as additives were added to calcium oxide, the reaction of calcium oxide delayed and the expansion pressure showed gradual increment. Especially, anhydrite showed a superior delaying effect than cement on the reaction of calcium oxide. |
| Key words:
Calcium oxide, Non-explosive demolition agent, Additives, Expansion pressure, Curing temperatures |
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