| Title |
A Proposal of Autogenous Deformation and Self-induced Restrained Stress Test Using Thermal Analysis Results to Predict Early-Age Cracks of Externally Restrained Concrete Members |
| Authors |
변종관(Byun, Jong-Kwan) ; 강원호(Kang, Won Ho) ; 강정길(Kang, Jeong-Kil) ; 배성재(Bae, Seong-Jae) |
| DOI |
https://doi.org/10.12652/Ksce.2018.38.1.0001 |
| Keywords |
자가변형;자체유발구속응력;외부구속;수화열 해석;초기균열 Autogenous deformation;Self-induced restrained stress;External restraint;Hydration heat analysis;Early-Age cracks |
| Abstract |
It is difficult to predict the early-age cracks of strain restrained concrete members due to environmentally sensitive parameters. A new method is proposed to predict the cracks by test of autogenous deformation and self-induced restrained stress of specimens which simulates early-age crack state by hydration heat of the'Wall-On-Foundation'members. For this purpose, thermal analysis of entire structure considering the environmental condition is performed at first, and the specimens are set up where hydration heat was electronically controlled according to the analysis results. By measuring free deformation and force to compensate the autogenous strain including relaxation, feasibility of cracks can be estimated. The proposed method can predict the occurrence of cracks better than the material test of the early age concrete which has large variance. The method of this study is particularly useful when it is used as a preliminary experiments to predict the crack more precisely before full-scale concrete placement in construction of large structures. |