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¼®È¸¼® ¹ÌºÐ¸»ÀÌ È¥ÀÔµÈ ÄÜÅ©¸®Æ®ÀÇ °¡¿ ÈÄ ÀÜ·ù ¾ÐÃà°µµ¿¡ °üÇÑ ¿¬±¸ / A Study on the Residual Compressive Strength of Concrete Mixed with Limestone Powder after Heating |
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Çѱ¹°ÇÃà½Ã°øÇÐȸ ³í¹®Áý, Vol.24 No.5 (2024-10) |
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½ÃÀÛÆäÀÌÁö(553) ÃÑÆäÀÌÁö(11) |
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¼®È¸¼® ¹ÌºÐ¸»; ½Ã¸àÆ® ´ëüÀç·á; ¾ÐÃà°µµ; °¡¿ ÈÄ ÀÜ·ù ¾ÐÃà°µµ; °í¿Â ¿Àû Ư¼º ; limestone powder; cement substitute; compressive strength; residual compressive strength after heating; thermal characteristics |
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In this research, the thermal properties of limestone fine powder at high temperatures were examined, followed by an analysis of its residual compressive strength when incorporated into concrete under various thermal conditions, to determine its impact on concrete subjected to high heat. The study revealed that at 900¡ÆC, limestone micropowder undergoes a decarbonization reaction, where calcium carbonate(CaCO3) decomposes into calcium oxide(CaO), accompanied by an expansion of the limestone powder as temperature increases. This expansion leads to material cracking or crushing starting at temperatures above 500¡ÆC. Further analysis on concrete mixed with limestone powder showed that heating up to 300¡ÆC could promote the reaction of hydrates within the concrete, thereby enhancing its strength. However, exposure to temperatures beyond 500¡ÆC causes the limestone powder within the concrete to crack or fracture, significantly reducing the concrete's strength properties. This study highlights the dual role of limestone fine powder in influencing concrete¡¯s behavior under high- temperature scenarios, demonstrating an initial strengthening effect followed by a detrimental impact at higher temperatures. |