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2025 Vol.15, Issue 1 Preview Page

Scientific Paper

Comparative study for estimation methods of binder absolute viscosity in short-term aged dense-grade asphalt mixtures

단기노화 밀입도 아스팔트혼합물 바인더의 절대점도 추정 방식의 비교연구

Wonbae Kim1
,
Woohyun Kim2
,
Sungjin Lee3
,
Mingeon Choi4
,
Kwang W. Kim5*
김 원배1
,
김 우현2
,
이 성진3
,
최 민건4
,
김 광우5*
1Graduate Student, Civil Eng. Dept., Graduate School, Kangwon National University, Chuncheon, Korea
2Director, Research and Development Center, SI Corporation, Suncheon, Korea
3Senior Researcher, Korea Conformity Laboratories, Gyeonggi-Gangwon Center, Chuncheon, Korea
4Junior Technical Manager, POSCO Gwangyang Works, Gwanyang, Korea
5Professor Emeritus, Regional Infrastructure Engineering Dept., Kangwon National University
1강원대학교 대학원 토목공학과 박사과정
2에스아이 연구소장
3KCL선임연구원
4포스코광양제철소 기술매니져
5강원대학교 지역건설공학과 명예교수
*Corresponding Author
4 July 2025. pp. 88-98
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Abstract

The hot-mix asphalt (HMA) is short-term aged during haul-and-queue before paving. The short-term aging (STA) level is mainly evaluated by absolute viscosity (AV) of the recovered binder from the mix. Since measuring AV from the aged mix is time-consuming task, instead of measuring AV, several techniques were developed to get an estimated AV (EAV). In this study, two AV estimation methods were evaluated; one is gel-permeation chromatography (GPC) test and another is aging quantity (AQ) method. The GPC is chemical test measuring the ratio (%) of large molecular size (LMS) of asphalt in mixture sample. The AQ is a numerical value representing agedness quantitatively by using time (min) and temperature (°C) of STA. The target material was dense-graded normal asphalt mixture prepared using PG64-22 binder. The best-fit numerical model from the regression between AV and LMS is used to determine EAV for GPC method. The best-fit regression model between AV and AQ is used to assess EAV for AQ method. The regression analysis between two EAV data sets determined by each of the two methods showed an excellent correlation (R2>0.98). Statistical t-test between two data set arrays showed no-significant difference between two EAV data sets. No-significant differences were also found from the t-tests between measured AV vs. EAV by LMS, and measured AV vs. EAV by AQ. Therefore, the EAV determined by LMS method or by AQ method was found to be a convenient estimated value in place of measured AV.

Keywords
Short-term aging (STA)
absolute viscosity (AV)
GPC
aging quantity (AQ)
estimate absolute viscosity (EAV)
t-test
References
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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 : 15
  • No :1
  • Pages :88-98
  • Received Date : 2025-06-12
  • Revised Date : 2025-06-20
  • Accepted Date : 2025-06-25
  • DOI :https://doi.org/10.22702/jkai.2025.15.1.9
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