고온을 받는 순환굵은골재 콘크리트의 역학적 특성에 관한 연구

DOI QR코드

DOI QR Code

신우철;이호경;백승민;김우석;권우현;곽윤근
Shin, Woo-Cheol;Lee, Ho-Kyung;Baek, Seung-Min;Kim, Woo-Suk;Kwon, Woo-Hyun;Kwak, Yoon-Keun

  • 투고 : 2015.04.01
  • 심사 : 2015.07.08
  • 발행 : 2015.07.30

초록

The main purpose of this study is to investigate on residual mechanical performance of recycled coarse aggregate concrete (RCAC), after being subjected to high temperatures. In this experiment, a control concrete mix made with natural coarse aggregates and two concrete mixes with RCA replacement ratio of 15% and 30% were designed. Specimens were exposed for a period of $1^{\circ}C/min$ to temperatures of $20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$ and $800^{\circ}C$. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) Residual compressive strength; (ii) Residual splitting tensile strength; (iii) Residual flexural strength; (iv) Elastic modulus; (v) SEM analysis & XRD analysis. In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of RCAC.

키워드

순환굵은골재;고온;역학적 특성;잔존강도;잔존탄성계수;주사전자현미경 분석;X-선회절분석

참고문헌

  1. Choi, K. C., Lee, T. K., Nam, J. S., Park, B. G., & Kim, K. Y. (2012). Evaluation of Spalling Property and Water Vapor Pressure of Concrete with Heating Rate, Journal of the Korea Concrete Institute, 24(5), 605-612. https://doi.org/10.4334/JKCI.2012.24.5.605
  2. Committee European de Normalisation(2004). Eurocode 2 : Design of Concrete Structures. Part 1-2 : General Rules - Structural Fire Design
  3. Folagbade, S. O. (2012). Concrete at Elevated Temperatures. International Journal of Engineering Research and Applications (IJERA), 2(6), 1620-1629.
  4. Georgali, B., & Tsakiridis, P. E. (2005). Microstructure of Fire-Damaged Concrete. Cement & Concrete Composites, 27(2), 255-259 https://doi.org/10.1016/j.cemconcomp.2004.02.022
  5. Han, M. C., & Choi, H. K. (2011). The Effect on Mechanical Properties and Micro-Structure of High Strength Concrete at Elevated Temperatures, Journal of the Architectural Institute of Korea, 27(13), 123-130.
  6. Kim, H. D., & Yang, S. H. (2014). An Experimental Study on the Fragility Factor of High Strength Concrete. The Korea Institute of Building Construction, 14(1), 148-149
  7. Kim, K. Y., Jung, S. H. Lee, T. G., Kim, Y. S., & Nam, J. S. (2010). Compressive Behavior of Concrete with Loading and Heating. Korea Institute for Structural Maintenance and Inspection, 14(4), 119-125.
  8. Korea Ministry of Environment (2012). Generation and Treatment Status of the National Solid Waste.
  9. Korea Ministry of Environment (2012). Second Recycling General Strategy of Construction Wastes.
  10. Korea Ministry of Land, Infrastructure and Transport (2012). Recycled aggregate Quality Requirement.
  11. Kwon, Y. J., Kim, M. H., Kim, Y. R., & Jang, J. B. (2005). Experimental Study on the Engineering Properties of Deteriorated Concrete by Fire Damage, Journal of the Architectural Institute of Korea, 21(1), 107-114.
  12. Lee, S. M. (2005). Evaluation and Repair Methods of Fire-Damaged Concrete Structures. The Korean Society for Railway(KSR), 8(1), 25-32
  13. RILEM TC 129-MHT (1995). Part 3-Compressive Strength for Service and Accident Conditions. Material and Structures, 28, 410-414. https://doi.org/10.1007/BF02473077
  14. Schneider, U. (1982). Behavior of Concrete at High Temperature, Deutscher Ausschuss Fur Stahlbeton, HEFT 337.
  15. Schneider, U. (1985). Properties of Materials at High Temperatures, RILEM-Committee44-PHT, Department of Civil Engineering, University of Kassel.
  16. Seo, C. H., & Kim, B. Y. (2005). An Experimental Study on the Durability of Recycled Aggregate Concrete, Journal of the Korea Concrete Institute, 17(3), 153-169.

과제정보

연구 과제 주관 기관 : 금오공과대학교