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2022 Vol.12, Issue 2 Preview Page

Scientific Paper

Suggestion for aging quality control proposal based on aging characteristics of new and in-service asphalt mixtures by implementing GPC test

GPC를 이용한 신규 및 공용중인 아스팔트 혼합물의 노화특성분석을 통한 노화품질관리방안 제시

Yeongsam Kim1
,
Wonbae Kim2
,
Sungun Kim3
,
Kwang W. Kim4*
김 영삼1
,
김 원배2
,
김 성운3
,
김 광우4*
1Ph.D. Candidate, Regional Infrastructure Engineering, Kangwon National University
2Research Engineer, Advanced Construction Technology Research Center, Kangwon National University
3Ph.D. Managing Director, Asphalt Research & Technologies Laboratory, Samwoo IMC.
4Professor Emeritus, Regional Infrastructure Engineering, Kangwon National University
1강원대학교 지역건설공학과 박사수료
2강원대학교 첨단건설기술연구소 연구원
3삼우아이엠씨 아스팔트연구소 소장
4강원대학교 지역건설공학과 명예교수
*Corresponding Author
11 January 2023. pp. 301-315
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Abstract

This study was designed to suggest an aging quality control protocol of normal asphalt mixture based on short-term aging (SA) data of lab mix and long-term aging data from in-service pavement mixes by using gel-permeation chromatography (GPC) test. The target material was dense-graded normal asphalt mixture for surface course pavement prepared using PG64-22 binder and 13mm granite aggregates. Three times (1, 2 and 4 hours) were used for SA of warm-mix asphalt (WMA) mixes at 135°C, and hot-mix asphalt (HMA) mixes at 160°C and 180°C. The large molecular size (LMS) by GPC from mix and absolute viscosity (AV) from recovered binder were measured and used for regression analysis. The AV was estimated by using the best-fit regression model and the estimated AV (EAV) was used to predict the service life reduction (SLR) of SA treated mix. Since EAV were increased as a function of temperature and time exponentially, the EAV of typical winter season mix was increased to the EAV level of 8-year old pavement by 2h SA at 180°C. The 8-year old level aging due to the severe SA can be counted as the loss of 8-year service life, or 8-year of SLR. However, the significant aging was reduced up to 70% by using 1.5 wt. % of hydrated lime. The WMA mixes were found to be safe from aging damage when treated 4h SA at 135°C, but all HMA mixes by SA at 160°C and 180°C for 2 and 4h showed 2 to 15 years of SLR. The EAV level of proper SA mix was estimated to be 4 killo poise (kp), which was obtained from binder RTFO or SA at 160°C for 1 hour. The EAV of 6 kp was suggested as critical EAV based on the hypothesis of 3σ level statistical quality control practice. When the EAV estimated from field mix LMS is over 6 kp, any necessary action can be applied for regulating the premature damage of asphalt pavement.

Keywords
Asphalt aging
GPC
LMS
absolute viscosity
Short-term aging
service life reduction
References
1
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2
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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 :2
  • Pages :301-315
  • Received Date : 2022-12-14
  • Revised Date : 2022-12-19
  • Accepted Date : 2022-12-20
  • DOI :https://doi.org/10.22702/jkai.2022.12.2.26
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