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Scientific Paper

Effect of Anti-stripping Additive on Short-term Aging and Service Life of Asphalt Mixtures

박리방지제 사용이 아스팔트 혼합물의 단기노화 및 공용수명에 미치는 영향

Yeongsam Kim1
,
Baesun Dong2
,
Jaewon Jo2
,
Sungun Kim3
,
Kwang W. Kim4*
김 영삼1
,
동 배선2
,
조 재원2
,
김 성운3
,
김 광우4*
1Ph.D. Student, Department of Regional Infrastructure Eng., Graduate School, Kangwon National University
2M.S. Student, Department of Regional Infrastructure Eng., Graduate School, Kangwon National University
3Lecturer, Department of Regional Infrastructure Eng., Kangwon National University
4Professor, Department of Regional Infrastructure Eng., Kangwon National University
1강원대학교 대학원 지역건설공학과 박사과정
2강원대학교 대학원 지역건설공학과 석사과정
3강원대학교 지역건설공학과 강사
4강원대학교 지역건설공학과 교수
* Corresponding Author
31 December 2018. pp. 89-102
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Abstract

The normal hot-mix asphalt (HMA) mixture is aged significantly during the short-term aging (STA) period if the mixture temperature is higher (i.e., 180°C or over) than normal (i.e., 160°C) and time is longer than 2 hours. In that case, to control the aging, an anti-oxidant can be used. According to earlier experiences, the hydrated lime (HL), one of the anti-stripping additives (ASA), has known to have a binder age-retarding function in the mixture. Following use of HL for stripping control, the liquid-type ASA (LA) was developed for stripping control too. When the aging is becoming an issue lately for maintaining durability and service life of pavement, the HL is highlighted as one of the premium additives for aging control. Therefore, when HL is added to asphalt mixes for stripping control, it reacts as an age-retarder in addition to ASA function. However, it has not been well known that all ASAs have similar age-retarding function. Many LAs are known to have good stripping control function, but their anti-aging function is not known. Therefore, this study examine the effect of ASA on aging level of asphalt mixture and service life of asphalt mixtures later in the field. The results showed that the HL clearly reduced aging level of binder measured by the large molecular size (LMS) and estimated absolute viscosity (EAV) from the LMS. The EAV of HL mix was the lowest in comparison with the plain (no additive) mix and LA-added mixes in dense grade and SMA mixes. Three of 4 LAs showed almost no anti-aging function and one showed even higher EAV, inducing significantly higher aging. The significant aging was found to cause a service life reduction. According to comparison with field mixture aging level, the 5-year service life reduction of an LA mix due to STA for 1 h at 180°C can be reduced to 1.37 year by using HL, making nearly 4-year service-life extension possible.

Keywords
Asphlat
HMA mix
Short-term aging
Stripping
Hydrated lime
Anti-stripping agent
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Information
  • Publisher :KOREAN ASPHALT INSTITUTE
  • Publisher(Ko) :한국아스팔트학회
  • Journal Title :Journal of the Korean Asphalt Institute
  • Journal Title(Ko) :한국아스팔트학회지
  • Volume : 8
  • No :2
  • Pages :89-102
  • Received Date : 2018-12-19
  • Accepted Date : 2018-12-27
  • DOI :https://doi.org/10.22702/jkai.2018.8.2.009
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