Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Evaluation of Fatigue Resistance of Selected Warm-mix Asphalt Concrete

준고온 아스팔트 콘크리트 피로저항성 평가

  • Kim, Sungun (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Lee, Sung-Jin (Pavement Research Division, Korea Expressway Corporation Research Institute) ;
  • Kim, Kwang W. (Department of Regional Infrastructure Engineering, Kangwon National University)
  • Received : 2020.03.06
  • Accepted : 2020.04.03
  • Published : 2020.05.31
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Abstract

Since some warm-mix asphalt (WMA) concretes were known to show poorer rut resistance than the hot-mix asphalt (HMA) concretes, many studies were performed in efforts of improving its performance at high temperature. The reason is assumed to be due to the moisture remaining in aggregates dried at lower temperature. Therefore, not only the rut resistance, the crack resistance of WMA concrete was also in question. In this study, fatigue life of WMA concrete was evaluated in comparison with HMA using 3-point bending (3PB) beam test. The asphalt mixtures were prepared based on Korean mix-design guide using a 13 mm dense-graded aggregate and 6 binders; two HMA binders and four WMA binders. By 3PB fatigue test, normal (unmodified) and polymer-modified WMA concretes were evaluated in comparison with normal and polymer-modified HMA concretes at a low temperature (-5℃). The results showed that most of WMA concretes showed longer fatigue lives than HMA concretes, even though the same PG binders were used for HMA and WMA. This result indicates that the WMA concretes have stronger resistance against fatigue cracking than HMA at the low temperature, and this result is in contrast to the high-temperature performance test.

Keywords

References

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