International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Fundamental Study on Optimum Mixing Proportion of Cement Concrete Pavement using Recycled Aggregate

순환골재를 활용한 포장용 시멘트콘크리트의 최적배합 도출을 위한 기초 연구

  • 김승원 (강원대학교 토목공학과) ;
  • 김용재 (강원대학교 건설시스템공학과) ;
  • 이장용 (강원대학교 토목건설공학과) ;
  • 이학용 (강원대학교 건설시스템공학과) ;
  • 박철우 (강원대학교 건설시스템공학과)
  • Received : 2016.10.26
  • Accepted : 2016.12.01
  • Published : 2016.12.15
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Abstract

OBJECTIVES : This study is to develop the optimum mixing proportions for cement concrete pavement with using recycled aggregates. METHODS : The mixture varied recycled coarse aggregates content from 50 % to 100 % to replace the natural coarse aggregates by weight. Tests for fundamental properties as a cement concrete pavement were conducted before and after hardening of the concrete. RESULTS : It was found that the variation in the amount of the recycled aggregate affected the compressive and flexural strength development, as well as the chloride ion penetration resistance. As the amount of the recycled aggregate content increased the compressive and flexural strength and the resistance to chloride ion penetration decreased. However, the resistance to freeze-thaw reaction was affected significantly. In addition, the gradation of the aggregate became worse and hence so did the coarseness factor as the recycled aggregate amount increased. CONCLUSIONS : The fundamental properties of the concrete with recycled aggregate does not seem to be appropriate when the recycled aggregate quality is not guaranteed up to a some level and its replacement ratio is over 50%. The optimized gradation of the aggregates should also be sought when the recycled aggregate is used for the cement concrete pavement materials.

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References

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