한국구조물진단유지관리공학회 논문집 (Journal of the Korea institute for structural maintenance and inspection)

  • 제18권2호
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  • Pages.99-107
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  • 2014
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  • 2234-6937(pISSN)
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  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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증기양생이 순환골재 콘크리트의 특성에 미치는 영향

Effect of Steam Curing on the Properties of Recycled Aggregate Concrete

  • 이승태 (군산대학교 토목공학과) ;
  • 최진엽 (군산대학교 토목공학과) ;
  • 박기태 (한국건설기술연구원 인프라구조연구실) ;
  • 서동우 (한국건설기술연구원 인프라구조연구실) ;
  • 유영준 (한국건설기술연구원 인프라구조연구실)
  • 투고 : 2013.09.30
  • 심사 : 2013.11.19
  • 발행 : 2014.03.30
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초록

본 연구에서는 순환골재 콘크리트의 성능에 대한 양생방법의 영향에 대하여 실험적으로 고찰하였다. 순환골재 콘크리트 제조를 위하여 부순골재에 순환골재를 0, 25, 50, 75 및 100%로 대체하였으며, 증기양생한 콘크리트의 압축 및 쪼갬인장강도, 투수공극, 염소이온 침투저항성 및 건조수축을 소정의 재령에서 측정하여 수중양생한 콘크리트의 성능과 비교하였다. 실험결과에 따르면, 양생방법에 관계없이 순환 골재 대체율이 증가할수록 콘크리트의 역학적 성능은 감소하였다. 한편, 초기재령에서 증기양생된 콘크리트는 수중양생된 콘크리트와 비교하여 매우 우수한 성능을 나타내었다. 그러나, 장기재령 (28일)에서 증기양생의 효과는 초기재령에 비하여 두드러지게 나타나지 않음을 알 수 있다. 결론적으로, 본 연구의 범위 내에서 순환골재 콘크리트의 성능향상을 위하여 증기양생법의 적용이 유용할 것으로 판단된다.

In this study, the effects of curing procedures on the mechanical properties of recycled aggregate concrete (RAC) were investigated. The replacement ratios by recycled coarse aggregate were 0, 25, 50, 75 and 100% by mass of natural coarse aggregate. Steam curing was adopted to all recycled aggregate concrete mixtures. Compressive and split tensile strength, water porosity, chloride ions penetration resistance and drying shrinkage measurements were carried out to determine performance of the RACs. From the test results, it was found that the mechanical performance of RAC decreased as the recycled aggregate contents increased. Furthermore, steam curing reduced the compressive and split tensile strength, water porosity and total charge of RAC, especially at the early ages. However, at the later ages, the beneficial effect of steam curing was less prominent. This study clearly showed that initial steam curing could be one of practical methods to improve performance of RAC with higher replacement ratio of recycled aggregate.

키워드

참고문헌

  1. Bakharev, T., Sanjayan, J. G., and Cheng, Y. B. (1999), Effect of elevated temperature curing on properties of alkali-activated slag concrete, Cement and Concrete Research, 29(10), 1619-1625. https://doi.org/10.1016/S0008-8846(99)00143-X
  2. BCSJ (1977), Proposed standard for the use of recycled aggregate and recycled aggregate concrete, Building Contractors Society of Japan Committee on Disposal and Reuse of Construction Waste.
  3. DIN 4226-100 (2000), Mineral Aggregates for Concrete and Mortar - Part 100: Recycled Aggregates.
  4. Fonseca, N., de Brito, J., and Evangelista, L. (2011), The influence of curing conditions on the mechanical performance of concrete made with recycled concrete waste, Cement and Concrete Composites, 33(6), 637-643. https://doi.org/10.1016/j.cemconcomp.2011.04.002
  5. Kim, S. S., Lee, J. B., Ko, J. S., and Kim, I. K. (2013), A study on the nano silica sol coating for improving performance of recycled aggregate, Journal of the Korea Institute for Structural Maintenance and Inspection, 17(4), 84-90 (in Korean). https://doi.org/10.11112/jksmi.2013.17.4.084
  6. Kim, S. W., Lee, H. A., Jung, C. K., and Kim, K. H. (2010), Experimental study on bond performance of RC beams according to absorption of recycled coarse aggregates, Journal of the Korea Institute for Structural Maintenance and Inspection, 14(3), 100-107 (in Korean).
  7. Lee, C. Y., and Bae, S. Y. (1998), The strength development of fly ash concrete in steam curing, Journal of the Korean Concrete Institute, 10(1), 613-620 (in Korean).
  8. Lee, M. K., Kim, K. S., Lee, K. H., and Jung, S. H. (2005), Strength of recycled concrete with furnace slag cement under steam curing condition, Journal of the Korean Concrete Institute, 17(4), 613-620 (in Korean). https://doi.org/10.4334/JKCI.2005.17.4.613
  9. Lee, S. T. (2008), Effect of curing procedures on the strength and permeability of cementitious composites incorporating GGBFS, Journal of Ceramic Processing Research, 9(4), 358-361.
  10. Ministry of Environment (2005), Construction waste recycling survey report, 6-15 (in Korean).
  11. Otsuki, N., Miyazato, S., and Yodsudjai, W. (2003), Influence of recycled aggregate on interfacial transition zone, strength, chloride penetration and carbonation of concrete, Journal of Materials in Civil Engineering, 15(5), 443-451. https://doi.org/10.1061/(ASCE)0899-1561(2003)15:5(443)
  12. Poon, C. S., Kou, S. C., and Chan, D. (2006), Influence of steam curing on hardened properties of recycled aggregate concrete, Magazine of Concrete Research, 58(5), 289-299. https://doi.org/10.1680/macr.2006.58.5.289
  13. PrEN 13242 (2002), Aggregates for Unbound and Hydraulically Bound Materials for Use in Civil Engineering Work and Road Construction, European Committee for Standardization.
  14. RILEM TC 172-EDM/CIB TG 22 (1999), Environmental Design Methods in Materials and Structural Engineering.
  15. Ryou, J. (2003), An experimental study on the effect of recycled aggregate on concrete properties, Magazine of Concrete Research, 54(1), 7-12.
  16. Tom, V. W. Y., Gao, X. F., and Tam, C. M. (2005), Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach, Cement and Concrete Research, 35(6), 1195-1203. https://doi.org/10.1016/j.cemconres.2004.10.025
  17. Yang, E. I., Kim, I. S., Yi, S. T., and Lee, K. M. (2010), Comparison of measurement methods and prediction models for drying shrinkage of concrete, Journal of the Korea Concrete Institute, 22(1), 85-91 (in Korean). https://doi.org/10.4334/JKCI.2010.22.1.085
  18. Zhan, B., Poon, C., and Shi, C. (2013), $CO_2$ curing for improving the properties of concrete blocks containing recycled aggregates, Cement and Concrete Composites, 42, 1-8. https://doi.org/10.1016/j.cemconcomp.2013.04.013