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Çѱ¹µµ·ÎÇÐȸ / v.11, no.4, 2009³â, pp.87-94
ÄÜÅ©¸®Æ® ½½·¡ºê °ÇÁ¶¼öÃà ÀÀ·Â °¨¼Ò¿¡ °üÇÑ Ãʱ⿬±¸
( A Preliminary Study on Reduction of Shrinkage Stress in Concrete Slabs )
¹ÚÁ¤¿ì;Á¤¿µµµ;ÀÓÁø¼±;Á¤ÁøÈÆ; ÀÎÇÏ´ëÇб³ Åä¸ñ°øÇаú;ÀÎÇÏ´ëÇб³ Åä¸ñ°øÇаú;ÀÎÇÏ´ëÇб³ Åä¸ñ°øÇаú;ÀÎÇÏ´ëÇб³ Åä¸ñ°øÇаú;
 
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ÄÜÅ©¸®Æ® ½½·¡ºê´Â Ÿ¼³ ÈÄ ¿Âµµ¿Í ¼öºÐ º¯È­¸¦ ÅëÇØ üÀûÀÌ º¯È­ÇÑ´Ù. ¼öºÐÁõ¹ß¿¡ ÀÇÇÏ¿© ¹ß»ýÇÑ °ÇÁ¶¼öÃàÀº ½½·¡ºêÀÇ ÀÚÁßÀ̳ª ÇϺÎÃþ°úÀÇ ¸¶Âû µî¿¡ ÀÇÇÏ¿© ±¸¼ÓµÇ¾î ½½·¡ºê ³»ºÎ¿¡ ÀÀ·ÂÀÌ À¯¹ßµÈ´Ù. ¼±Çà ¿¬±¸¿¡ ÀÇÇÏ¸é °ÇÁ¶¼öÃà¿¡ ÀÇÇÏ¿© ¹ß»ýµÈ ½ÇÁ¦ ÀÎÀåÀÀ·ÂÀº ÀÌ·ÐÀûÀ¸·Î ¿¹ÃøµÈ °ªº¸´Ù ÀÛÀº °ÍÀ¸·Î º¸°íµÇ¾ú´Ù. ÀÌ´Â ºÎºÐÀûÀ¸·Î ±¸¼ÓµÈ ½½·¡ºê¿¡¼­ ¹ß»ýÇÏ´Â Ãʱâ Àç·É ÄÜÅ©¸®Æ®ÀÇ Á¡Åº¼º¿¡ ±âÀÎÇÑ ÀÀ·Â°¨¼Ò Çö»óÀÌ´Ù. º» ¿¬±¸¿¡¼­´Â Àç·É¿¡ µû¸¥ ÄÜÅ©¸®Æ®ÀÇ ÀÀ·Â°¨¼Ò Çö»óÀ» Á¶»çÇϱâ À§ÇÏ¿© ±¸¼ÓµÈ ¿øÁÖÇü, ±¸¼ÓµÇÁö ¾ÊÀº ÀÚÀ¯°ÇÁ¶ ¿øÁÖÇü, ±×¸®°í ÀÚÀ¯°ÇÁ¶ °¢ÁÖÇü ÄÜÅ©¸®Æ® ½ÃÆíÀÇ º¯Çü·üÀ» ÃøÁ¤ÇÏ¿´´Ù. Àç·É 1, 3, 7, 14, 28ÀÏ¿¡ ÄÜÅ©¸®Æ®ÀÇ Åº¼º°è¼ö¸¦ ÃøÁ¤ÇÏ¿´À¸¸ç °üÀÔÀúÇ× ½ÇÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ½ÇÇè°á°ú¸¦ ±âÁ¸ ¿¬±¸ÀÚµéÀÌ Á¦¾ÈÇÑ À̷нĿ¡ ´ëÀÔÇÏ¿© ±¸¼ÓµÈ ¿øÁÖÇü ÄÜÅ©¸®Æ® ½ÃÆíÀÇ ÀÀ·Â°¨¼Ò¸¦ °è»êÇÒ ¼ö ÀÖ¾ú´Ù. ÇâÈÄ º» ¿¬±¸ÀÇ °á°ú¸¦ ¹ÙÅÁÀ¸·Î ±¸¼ÓµÈ ÄÜÅ©¸®Æ® ½ÃÆíÀÇ ÀÀ·Â°¨¼Ò Çö»óÀ» ÄÜÅ©¸®Æ® Æ÷ÀåÀÇ ¼³°è¿¡ Àû¿ëÇÒ ¿¹Á¤ÀÌ´Ù.
Volume of concrete slab changes by variations of temperature and moisture after its placement. Shrinkage due to evaporation causes tensile stress in the slab when contraction of the slab is restrained by its self weight, friction with subbase, and etc. Actual tensile stress caused by the shrinkage was less than theoretically predicted stress according to previous studies. It was the stress reduction due to visco-elastic property of the early-age concrete slab partially restrained. In this study, strains of restrained circumferential, unrestrained circumferential, and unrestrained square pillar concrete specimens were measured to investigate stress reduction of the specimens with age of concrete. Elastic modulus of the concrete was measured at the age of 1, 3, 7, 14, 28 days and penetration test was performed. The stress reduction was calculated by input the test results into theoretical equations suggested by previous researchers. The stress reduction of the restrained concrete specimens will be applied to design of concrete pavements based on results of the study.
 
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ÀÀ·Â°¨¼Ò;ÄÜÅ©¸®Æ® ½½·¡ºê;°ÇÁ¶¼öÃà;ÀÎÀåÀÀ·Â;º¯Çü·ü;stress reduction;concrete slab;shrinkage;tensile stress;strain;
 
Çѱ¹µµ·ÎÇÐȸ³í¹®Áý / v.11, no.4, 2009³â, pp.87-94
Çѱ¹µµ·ÎÇÐȸ
ISSN : 1738-7159
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200909659864470)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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