DOI QR코드

DOI QR Code

Evaluation of Properties of Warm-Mix Recycled Asphalt Binder for Promoting the Recycled Asphalt

순환골재 활성화를 위한 중온 재생 아스팔트 바인더 특성 평가

  • Received : 2016.08.26
  • Accepted : 2016.10.14
  • Published : 2016.12.01

Abstract

As an increase in the amount of RAP, there are growing interests in recycling asphalt concrete. In case of using the RAP as recycled asphalt pavement, it tends to be quality deteriorate. Therefore, the amount of RAP using is advised to be limited or has to be used with rejuvenator. In this study, asphalt mixture containing WMRA was analyzed to be used up to 50% for the sake of convenience on the process. As the results of evaluation, there was no significant difference in case of using 30% of RAP in the test of Marshall stability. However, in case of WMRA using up to 50%, it was satisfied criteria by flow value at 34.7. Further, result of toughness test was found that the crack resistance showed 55% higher than using straight asphalt when using WMRA binder up to 50%. According to the results of directly comparing crack resistance through repeated direct tensile test, it was shown that the fatigue crack resistance of WMRA pavement was increased by 263%. Therefore, it was shown that WMRA binder was effective in recycling RAP because WMRA binder could increase the percentage of RAP using up to 50%.

폐아스팔트 콘크리트(RAP)의 발생이 증가함에 따라 이를 자원으로 재활용 할 수 있는 재생 아스팔트 콘크리트에 대한 관심이 높아지고 있다. 폐아스팔트 콘크리트를 아스팔트 콘크리트용 순환골재로 사용할 경우 품질저하로 인해 사용량을 제한하거나 재생첨가제를 사용하도록 하고 있다. 본 연구에서는 공정상의 편리성을 위해 재생첨가제가 포함된 중온 재생 아스팔트 바인더(WMRA)를 사용하여 RAP의 사용비율을 50% 까지 증가시킬 수 있는 재생 아스팔트 콘크리트의 실내 공용성능 평가를 수행하였다. 마샬안정도 실험 결과 RAP 30% 사용시에는 WMRA 바인더와 스트레이트 아스팔트 바인더 사용시 큰 차이가 없었으나 RAP 혼합비율이 50%로 늘어날 경우 WMRA 바인더 사용시 흐름값 34.7 (1/10 mm)로 기준을 만족시킬 수 있는 것으로 나타났다. 간접인장강도 실험의 터프니스 계산 결과 RAP 사용비율 50% 일 때 WMRA 바인더 사용시 스트레이트 아스팔트 바인더 사용시에 비해 55% 높은 값을 나타내어 균열저항성이 향상된 것을 알 수 있었다. 또한 반복직접인장실험을 통해 직접적인 균열저항성 비교 결과 WMRA 재생 아스팔트 콘크리트의 피로균열 저항성이 263% 증가하는 것으로 나타나 WMRA 바인더가 RAP 사용비율을 50%까지 높일 수 있어 RAP의 재활용에 효과적인 것으로 나타났다.

Keywords

References

  1. Huh, J. D. (2009). "Development of new technology for 100% RAP recycling." 2009 International Journal of Highway Engineering, Korean Society of Road Engineers, pp. 583-586 (in Korean).
  2. Kim, U. Y. (2012). "A study for recycling of waste asphalt by warm mix asphalt rejuvenator." Thesis, Kyunghee University (in Korean).
  3. Korea Recycled Asphalt Association (2015). Available at: http://www.krascon.or.kr/html/board.php?boardName=board_static&mode=view&b_no=9&page=1 (Accessed: August 24, 2015) (in Korean).
  4. KS I 3005 (2014). "Recycled hot Asphalt Paving Mixtures." (in Korean).
  5. Lee, S. H. (2006). "A study on the mechanical properties and application of modified asphalt mixture recycled aggregates." Thesis, Daejeon University (in Korean).
  6. Ministry of Environment (ME) (2015). "Environmental Statistics Yearbook 2014." (in Korean).
  7. Ministry of Land, Infrastructure and Transport (MOLIT) (2012). Notification No. 2012-1096 (in Korean).
  8. Ministry of Land, Infrastructure and Transport (MOLIT) (2014). Notification No. 2014-105 (in Korean).
  9. Zhou, F. and Scullion, T. (2003). "Upgraded overlay tester and its application to characterize reflection cracking resistance of asphalt mixtures." Report No. FHWA/TX-04/0-4467-1, Texas Transportation Institute.
  10. Zhou, F. and Scullion, T. (2005). "Overlay tester- a rapid performance related crack resistance test." Report FHWA/TX-05/0-4467-2, Texas Transportation Institute.