[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.12652/Ksce.2018.38.1.0001

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

Byun, Jong-Kwan (Seoyeong Engineering Co., LTD.)
Kang, Won Ho (Dong-A University)
Kang, Jeong-Kil (DMEngineering)
Bae, Seong-Jae (Interconstech R&D center)

Publication Information

KSCE Journal of Civil and Environmental Engineering Research / v.38, no.1, 2018 , pp. 1-10 More about this Journal

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.

Keywords

Autogenous deformation; Self-induced restrained stress; External restraint; Hydration heat analysis; Early-Age cracks;

Citations & Related Records

Reference

1	Schoppel, K., Plannerer, M. and Springenschmidt, R. (1994). "Determination of restraint stresses and of material properties during hydration of concrete with the temperature stress testing machine." Proceeding of the International RILEM Symposium on Thermal Cracking in Concrete at Early Ages, pp. 153-160.
2	Springenschmidt, R., Breitenbucher, R. and Mangold, M. (1994). "Development of the cracking frame and the temperature stress testing machine." Proceeding of the International RILEM Symposium on Thermal Cracking in Concrete at Early Ages, pp. 137-144.
3	Staffa, M. (1993). "Vermeidung von hydratationsrissen in stahlbetonwanden." Dissertation, Technische Universitat Berilin (in German).
4	TNO (2014). DIANA user's manual, TNO DIANA Bv.
5	Byun, J. K. (2015). "Restrained stress and sracking behaviour in early age concrete-Test and engineering approach." Ph.D. Dissertation, Dong-A University.
6	Gutsch, A.W. (1999). "Stoffeigenschaften jungen betons - Versuche und modellle." Deutscher AusschuB fur Stahlbeton, Heft 495, Beuth Verlag (in German).
7	Korea Road and Transportation Association (2012). "Korean highway bridge design code (Limit States Design Method)." (in Korean).
8	Lura, P. (2003). "Autogenous deformation and internal curing of concrete." Delft University Press, pp. 80-82.
9	Ministry of Land, Transport and Maritime Affairs (MLTMA) (2009). Standard Specification for Concrete (in Korean).
10	Rohling, S. (2005). "Zwangsspannungen infolge hydratationswarme." Verlag+Technik GmbH, Dusseldorf, pp. 5-10 and pp. 188-190 (in German).
11	Rostasy, F. S. (2001). "Fruhe risse in massigen betonbauteilen ingenieurmodelle fur die planung von gegenmaBnahmen." Deutscher AusschuB fur Stahlbeton, Heft 520, Beuth Verlag (in German).
12	Schleeh, W. (1962). "Die zwangspannungen in einseitig festgehaltenen wandscheiben." Beton- und Stahlbetonbau 57 H.3, 1962, pp. 64-72 (in German).