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Çѱ¹µµ·ÎÇÐȸ / v.11, no.2, 2009³â, pp.185-194
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Áö¿¬Á¦ ÇÔ·® º¯È¿¡ µû¸¥ ÃÊ¼Ó°æ ¶óÅØ½º°³Áú ÄÜÅ©¸®Æ®(VES-LMC)ÀÇ ÀÚ±â¼öÃà
( Autogenous Shrinkage of Very-Early Strength Latex-Modified Concrete with Retarder Contents ) |
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| ÃÊ¼Ó°æ ¶óÅØ½º°³Áú ÄÜÅ©¸®Æ®(VES-LMC)¸¦ Æ÷ÇÔÇÑ °í¼º´É ÄÜÅ©¸®Æ®´Â ³·Àº ¹°-½Ã¸àÆ®ºñ, ³ôÀº °áÇÕÀç·® ¹× °í¼º´É°¨¼öÁ¦ÀÇ »ç¿ë µîÀ¸·Î ÀÎÇØ ÀÚ±â¼öÃà(Autogenous Shrinkage)ÀÌ 1Á¾ ÄÜÅ©¸®Æ®(OPC)º¸´Ù Å©°Ô ³ªÅ¸³´Ù. ÃÊ¼Ó°æ ¶óÅØ½º°³Áú ÄÜÅ©¸®Æ®ÀÇ ¹èÇÕÆ¯¼ºÀº ³·Àº ¹°-½Ã¸àÆ®ºñ(0.38), ³ôÀº ´ÜÀ§½Ã¸àÆ®·®($390kg/m^3$) ¹× ¶óÅØ½ºÃ·°¡(´ÜÀ§½Ã¸àÆ®·® ´ëºñ 15%)·Î ±¸¼ºµÇ¹Ç·Î, ÀÚ±â¼öÃàÀÌ Å©°Ô ¹ß»ýÇÒ ¼ö ÀÖ°í, ¶ÇÇÑ ÄÜÅ©¸®Æ® Ÿ¼³ ÈÄ 3½Ã°£ À̳»¿¡ ¹ß»ýÇÏ´Â ±Þ°ÝÇÑ ¼öºÐ¼Ò»ê(Water Dissipation)°ú ¼öºÐÁõ¹ßÀº ÀÚ±â¼öÃàÀ» Áõ°¡½Ãų ¼ö ÀÖ´Ù. º» ³í¹®ÀÇ ¸ñÀûÀº ÇöÀå¿¡¼ ÀÛ¾÷½Ã°£ È®º¸¸¦ ¸ñÀûÀ¸·Î »ç¿ëµÇ´Â Áö¿¬Á¦ ÷°¡·® º¯È¿¡ µû¸¥ Ãʱâ¼öÃà, ¿Âµµº¯Çü ¹× ÀÚ±â¼öÃàÀ» Æò°¡ÇÏ´Â °ÍÀÌ´Ù. ½ÇÇè°á°ú Áö¿¬Á¦ÀÇ Ã·°¡´Â ÄÜÅ©¸®Æ®ÀÇ ÃÖ´ë ¼öÈ¿¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê´Â °ÍÀ¸·Î ³ªÅ¸³µÀ¸¸ç, ÃÊ¼Ó°æ ¶óÅØ½º°³Áú ÄÜÅ©¸®Æ®ÀÇ ÃÊ±â ÆØÃ¢Àº ÀϺΠÀÚ±âÆØÃ¢ÀÇ ¿µÇâÀÌ ÀÖ±â´Â ÇÏÁö¸¸ ´ëºÎºÐÀÌ ¿ÆØÃ¢¿¡ ±âÀÎÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. Áö¿¬Á¦ ÷°¡·®ÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ÀÚ±â¼öÃàÀÌ °¨¼ÒÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µÁö¸¸, Áö¿¬Á¦ÀÇ °úµµÇÑ »ç¿ëÀº °úµµÇÑ ÃÊ±â ÆØÃ¢À» ÀÏÀ¸Å³ ¼ö ÀÖÀ¸¹Ç·Î ÇöÀåÁ¶°ÇÀ» °í·ÁÇÏ¿© ½ÅÁßÇÏ°Ô °áÁ¤µÇ¾î¾ß ÇÑ´Ù. |
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| The autogenous shrinkage of high-performance concrete, including very-early strength latex-modified concrete(VES-LMC), is generally bigger than that of normal strength concrete because of the low water/cement ratio, high binder contents, and usage of superplasticizer. Mix. proportion of VES-LMC has low water/cement ratio(0.38), high cement content(390kg/m$^3$), and aid of latex(15% of cement weight). Thus, these factors of VES-LMC, rapid water self-dissipation and evaporation within 3 hours of concrete placement would increase the autogenous shrinkage. The purpose of this study was to evaluate the early-age shrinkage, thermal deformation and autogenous shrinkages of VES-LMC with retarder contents(retarder solids-cement ratio, by weight) using to secure working time in field. The experimental results showed that retarder contents do not affect of the maximum hydration temperature. Early-age expansion of VES-LMC was mostly caused by thermal expansion and partly by autogenous expansion. The autogenous shrinkage is decreased by increasing the retarder contents within this study. On the other hand, the usage of retarder should be decided carefully considering the field conditions because an excessive usage of retarder can cause handful early-age expansion. |
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| ÃÊ¼Ó°æ ¶óÅØ½º°³Áú ÄÜÅ©¸®Æ®;ÀÚ±â¼öÃà;Ãʱâ¼öÃà;¿Âµµº¯Çü;very-early strength latex modified concrete;autogenous shrinkage;early-age shrinkage;thermal deformation; |
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Çѱ¹µµ·ÎÇÐȸ³í¹®Áý / v.11, no.2, 2009³â, pp.185-194
Çѱ¹µµ·ÎÇÐȸ
ISSN : 1738-7159
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200921140045987)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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