The main purpose of this study is to provide fundamental data in reducing thermal cracks of mass concrete by using Urea. Substitution methods of Urea mixed concrete was different from existing substitution method of concrete. Therefore existing research for Urea mixed concrete had no definite criterion in performance evaluation. In this research, setting-up new criteria, Urea/Water ratio, when evaluating experiment results. As result of experiment, Cement Paste flow was increased largely when mixed in addition method. But there were almost no differences in degree of temperature reduction and time-delay.

• 박창건(정회원, 한양대학교 첨단건축도시환경공학과 석사과정) | Park, ChangGun
• 이한승(한양대학교 건축학부 교수, 공학박사) | Lee, Han Seung 교신저자