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http://dx.doi.org/10.4334/JKCI.2010.22.3.399

Effect of Freeze-Thaw Cycles after Cracking Damage on the Flexural Behavior of Reinforced Concrete Beams  

Kim, Sun-Woo (Chungnam National University)
Choi, Ki-Bong (Dept. of Architecture, Kyungwon University)
Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University)
Publication Information
Journal of the Korea Concrete Institute / v.22, no.3, 2010 , pp. 399-407 More about this Journal
Abstract
The flexural behaviors of two types of beam members exposed to freeze-thaw cycles were evaluated. This study aims to examine the effect of freeze-thaw cycles on the behavior characteristics of reinforced concrete (RC) beams. For the purpose, a part of the beam specimens were damaged until yielding of tension reinforcement was reached, before they were exposed to 150 and 300 cycles of freeze-thaw. Cyclic tests, as well as monotonic tests, were conducted to evaluate the stiffness degradation characteristics when same cycle is repeated. The material tests showed that relative dynamic modulus of concrete exposed to 300 cycles of freeze-thaw moderately decreased to 86.8% of normal concrete, indicating that concrete used in this study has good durability against freeze and thaw damage. The results of monotonic tests showed reduction of flexural strength, ductility and stiffness of the beam specimens exposed to freeze-thaw cycles compared with those of the control speciments. In particular, BDF13 specimens, which had been subjected to artificial cracking damage, did not showed enough flexural strength to satisfy nominal moment required by current concrete structure design code. In the monotonic tests results, BF75 specimens exposed to freeze-thaw cycles showed 10% or more cyclic stiffness degradation. Therefore, it was thought that deformation of concrete in compression have to be considered in design process of members under cyclic load, such as seismic device.
Keywords
reinforced concrete beams; flexural behaviors; freeze-thaw cycles; cracking damage; tension reinforcement;
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  • Reference
1 Nevil, A. M., Properties of Concrete, Fourth Edition, Longman, 1995, 287 pp.
2 기상청, 2008, http://www.kma.go.kr.
3 고경택, 김도겸, 김성욱, 조명석, 송영철, “동결융해와 염해의 복합작용을 받는 콘크리트의 내구성능 저하평가,” 콘크리트학회 논문집, 13권, 4호, 2001, pp. 397-405.   과학기술학회마을
4 고경택, “동결융해에 대한 설계 및 대책방안,” 콘크리트 학회지, 13권, 6호, 2001, pp. 44-51.   과학기술학회마을
5 노재준, 소양섭, 박홍신, 유영호, “동결융해작용을 받은 콘크리트의 파괴거동에 관한 연구,” 대한건축학회 학회지, 28권, 12호, 1984, pp. 57-64.
6 山下英俊, “凍結融解を受5けるコソクリ一トの劣化豫測に關する硏究,” コソクリ一ト工學年次論文報告集, Vol. 14, No. 1, 1992, pp. 1021-1026.
7 成田建., “凍害劣化確率モデル構成要素に及ばす影響要因の考察,” 日本建築學會構造系論文集, No. 455, 1994, pp. 1-6.
8 Ghaffori, N. and Mathis, R., “Prediction of Freezing and Thawing Durability of Concrete Paving Blocks,” Journal of Materials in Civil Engineering, Vol. 10, No. 1, 1998, pp. 45-51.   DOI   ScienceOn
9 한국콘크리트학회, “콘크리트구조설계기준,” 기문당, 2007, 523 pp.
10 지식경제부 기술표준원, “급속동결 융해에 대한 콘크리트의 저항 시험방법, KS F 2456,” 지식경제부 기술표준원, 2008, 14 pp.