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Çѱ¹Áö¹Ý°øÇÐȸ / v.22, no.10, 2006³â, pp.77-91
ÇöÀå½ÇÇè°ú º¹ÇÕ¿­È­½ÃÇèÀ» ÅëÇÑ °í°­µµ ¼ôÅ©¸®Æ®ÀÇ Àå±â³»±¸¼º °ËÅä
( An Investigation on the Long Term Durability of High-strength Shotcrete Using Field and Combined Deterioration Test )
¸¶»óÁØ;ÃÖÀç¼®;¾È°æÃ¶;±è¼±¸í;±èµ¿¹Î; Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø Åä¸ñÁö¹Ý¿¬±¸ºÎ;Çѱ¹°ÇÀÚÀç½ÃÇ迬±¸¿ø ½Å·Ú¼ºÆò°¡¼¾ÅÍ;¢ßÅÂÁ¶¿£Áö´Ï¾î¸µ Áö¹Ý»ç¾÷ºÎ;¢ß¹Ù¿ìÄÁ¼³ÅÏÆ®;Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø Åä¸ñÁö¹Ý¿¬±¸ºÎ;
 
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±¹³» ¼ôÅ©¸®Æ® °ü·Ã ±â¼úµéÀº Áö±Ý±îÁö ¸¹Àº ¹ßÀüÀ» ÀÌ·ç¾î ¿ÔÀ¸³ª Àç·á, ½Ã°ø ¹× °ü·Ã ǰÁú±Ô°Ý µî¿¡¼­ ¿©ÀüÈ÷ ¹®Á¦µéÀ» °¡Áö°í ÀÖ´Ù. ±¹¿ÜÀÇ °æ¿ì $39.2{sim}58.8 MPa$¿¡ À̸£´Â °í°­µµ ¼ôÅ©¸®Æ® ½Ã°øÀÌ °¡´ÉÇÏ¿© Åͳο¡¼­ 2Â÷ ¶óÀÌ´×ÀÇ ´ëü³ª Àå±â³»±¸¼ºÀÇ È®º¸°¡ ÃæºÐÈ÷ °¡´ÉÇÑ ¹Ý¸é, ±¹³»ÀÇ °æ¿ì ¼³°è°­µµ°¡ 20.6MPa ³»¿Ü·Î ³·Àº ÆíÀ̸ç Àå±â³»±¸¼ºµµ ½Å·ÚÇÏÁö ¸øÇϰí ÀÖ´Â ½ÇÁ¤ÀÌ´Ù. º» ¿¬±¸¿¡¼­´Â ±¹³» ¼ôÅ©¸®Æ®ÀÇ °­µµ ÁõÁøÀ» À§ÇØ °íǰÁú ȥȭÀç¿Í °í¼º´É ±Þ°áÁ¦¸¦ Àû¿ëÇÑ ÇöÀå½ÇÇèÀ» ½Ç½ÃÇÏ¿´°í, À¯·´ÅëÇÕ±Ô°Ý(EFNARC)¿¡ ÀǰÅÇÏ¿© ǰÁúÆò°¡¸¦ ¼öÇàÇÏ¿´´Ù. ¶ÇÇÑ, ź»êÈ­¿Í µ¿°áÀ¶ÇØÀÇ º¹ÇÕÀÎÀÚ¿¡ ÀÇÇÑ ¿­È­½ÃÇèÀ» ¼öÇàÇÏ¿© °í°­µµ ¼ôÅ©¸®Æ®ÀÇ Àå±â³»±¸¼ºÀ» Æò°¡ÇÏ¿´´Ù. ½ÇÇè°á°ú ¾ËÄ®¸® ÇÁ¸®°è ±Þ°áÁ¦¸¦ »ç¿ëÇÑ °æ¿ì ÃʱⰭµµ ÁõÁøÀ²ÀÌ $90{sim}97%$·Î °¡Àå ³ô°Ô ³ªÅ¸³µ°í, ½Ç¸®Ä« ÈâÀ» È¥ÀÔÇÑ ¼ôÅ©¸®Æ®ÀÇ ¾ÐÃà°­µµ´Â $45.2{sim}55.8MPa$, ÈÚ°­µµ´Â $5.01{sim}6.66MPa$·Î È¥ÀÔÇÏÁö ¾ÊÀº °æ¿ì¿¡ ºñÇØ °¢°¢ $37{sim}79%$, $17{sim}61%$ÀÇ °­µµ ÁõÁø È¿°ú°¡ ³ªÅ¸³µ´Ù. ¶ÇÇÑ, ½Ç¸®Ä« Èâ ġȯÀ²ÀÌ $7.5{sim}10%$ÀÏ ¶§ °­µµÁõÁø È¿°ú°¡ °¡Àå ¿ì¼öÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ƯÈ÷, ½Ç¸®Ä« ÈâÀÇ Ä¡È¯Àº °­¼¶À¯ È¥ÀÔ¿¡ ÀÇÇÑ ¼ôÅ©¸®Æ®ÀÇ ¿­È­Çö»óÀ» ÃÖ¼ÒÇÑÀ¸·Î °¨¼Ò½ÃÄÑ, ¼ôÅ©¸®Æ®ÀÇ Àå±â³»±¸¼ºÀ» È®º¸Çϴµ¥ È¿°ú°¡ ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.
Domestic practices in shotcrete use have developed in many respects even now, but it still has issues about material, construction, quality standard and so on. In overseas, the construction using high strength shotcrete with $39.2{sim}58.8 MPa$ of compressive strength is becoming common based on the shotcrete technology of high strength and durability. However, domestic shotcrete design strength is low at around 20.6 MPa of compressive strength and a long term durability is also insufficient. In this paper, field tests using high-quality additives and accelerators were performed to obtain the improvement of shotcrete strength and EFNARC standard was used to evaluate the field test results. In addition, deterioration test combined with the freezing-thawing and carbonation was also performed in order to investigate a long-term durability of high-strength shotcrete. As a result of the field test, the promotion ratio of early strength was $90{sim}97%$ in case of using alkali-free accelerators. And the compressive strength of the shotcrete using Micro-silica fume was $45.2{sim}55.8MPa$ and flexible strength was $5.01{sim}6.66MPa$, so the promotion ratio of strength was $37{sim}79%$ and $17{sim}61%$ respectively. The promotion effect of strength by silica fine additives ratio of $7.5{sim}10%$ for cement mass was much superior to the other cases. It was especially examined that using Micro-silica fume reduced deterioration due to mixed steel fiber and improved a long-term durability of shotcrete.
 
Ű¿öµå
Accelerators;Additives;Combined deterioration test;High-strength shotcrete;Micro-silica fume;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.22, no.10, 2006³â, pp.77-91
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200604623521109)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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