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Scientific Paper

Analysis of asphalt aging problem of HMA mixture due to the long-time insulated carriage for repair works

보수용 가열아스팔트 혼합물의 보온･운반에 따른 노화 문제점 분석

Yeongsam Kim1
,
Sungun Kim2
,
Wonbae Kim3
,
Kwang W. Kim4*
김 영삼1
,
김 성운2
,
김 원배3
,
김 광우4*
1Ph.D. Candidate, Regional Infrastructure Engineering, Kangwon National University
2Ph.D. Director, Asphalt research laboratories, SAMWOO IMC Co. Ltd.
3Research Engineer, Advanced Construction Research Center, Kangwon National University
4Professor Emeritus, Regional Infrastructure Engineering, Kangwon National University
1강원대학교 지역건설공학과 박사수료
2삼우아이엠씨 아스팔트연구소 소장
3강원대학교 첨단건설기술연구소 연구원
4강원대학교 지역건설공학과 명예교수
*Corresponding Author
18 July 2022. pp. 78-89
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Abstract

The hot-mix asphalt (HMA) mixture is kept in an insulated carriage for repair work for all day long. If the binder in the mix is severely oxidized due to the hot-temperature for long-time carriage, the repaired pavement will have to loose its service life. Therefore, a dense-graded HMA mix with PG64-22 was kept in 160°C oven for 1, 2, 4, 6 and 8-hour (h) for aging level evaluation. The gel-permeation chromatography (GPC) technique measured the large-molecular size (LMS) ratio of the binder in the mixture without binder recovery. The absolute viscosity (AV) was estimated from the LMS. Since it was found that AV of binder was increased by polynomial function form by the aging time, the estimated AV (EAV) of the binder in HMA mix was significantly increased. It was found that the binder EAV of 3-4 h aged mix was similar to the binder EAV level of 5-year-old asphalt pavement. The service life expressed by aging level can be interpreted as the service life reduction (SLR) of aged mix, which has already been oxidized before in service. Therefore, it was found that the binders of 4~8 h aged mix were significantly aged, and the SLRs were 6~10 years already. When the 8-h aged mix was used for pothole repair, the repaired mix was found to show an increased EAV than the binder EAV of original-pavement mix. Therefore, it is important to coup with the significant binder aging of the repair HMA mix in a carriage chamber.

Keywords
asphalt aging
repair work
GPC
large molecular size
absolute viscosity
stiffness
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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 : 12
  • No :1
  • Pages :78-89
  • Received Date : 2022-06-08
  • Revised Date : 2022-06-29
  • Accepted Date : 2022-06-29
  • DOI :https://doi.org/10.22702/jkai.2022.12.1.7
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