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Construction and Building Materials, Volume 45, 2013, Pages 192-198.
Inyeop Chu, Yun Lee, Muhammad Nasir Amin, Bong-Seok Jang, Jin-Keun Kim.
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea and
Department of Civil Engineering, Daejeon University, 62 Daehak-ro, Dong-gu, Daejeon 300-716, Republic of Korea and
NUST Institute of Civil Engineering, School of Civil and Environmental Engineering, National University of Science and Technology, Islamabad, Pakistan and
Dam Safety Research Center, K-water Institute, 200 Sintanjin-ro, Daedeok-gu, Daejeon 306-711, Republic of Korea.
Abstract
To predict thermal stress independent of uncertain material properties of early age concrete, a new thermal stress device was developed by Kim et al. in [1]. Several experiments and numerical analyses were performed to verify its validity. However, the application of the device in a real structure has yet to be attempted. Thus in this paper, the application of a stress device for predicting hydration-induced thermal stress in an actual structure is investigated. For this purpose, a series of experiments were performed by varying the amount of restraint in the thermal stress device. The reasonably good agreement between the restraint strains from the site and the stress device indicates that variation of the thermal stress at any position in concrete structures can be measured during the design stage even when the properties of the concrete are uncertain. The application of various degrees of constraint at a site can be achieved by the thermal stress device by varying the thermal expansion coefficient and the cross sectional area of the restraining frame.
