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Scientific Paper

Effect of laboratory compaction methods and curing conditions on the strength of cold in-place recycling mixture with bubble asphalt

실내 다짐방법 및 양생조건이 상온 현장 재활용 기포 아스팔트 혼합물의 강도에 미치는 영향

Yongjoo Kim1*
김 용주1*
1Research Fellow, Korea Institute of Civil Engineering and Building Technology, Department of Highway & Transportation Research
1한국건설기술연구원 도로교통연구본부 연구위원
*Corresponding Author
4 July 2025. pp. 122-135
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Abstract

Asphalt pavements are prone to deterioration and aging due to environmental factors such as sunlight, rainfall, and snowfall, as well as repeated traffic loading. Consequently, regular maintenance and rehabilitation are essential. In many countries, cold in-place recycling (CIR) with bubble asphalt has been actively adopted as a sustainable asphalt pavement rehabilitation method. This technique involves milling aged asphalt pavement on-site, mixing it with bubble asphalt at ambient temperature, and immediately repaving. However, in Korea, a standardized mix design procedure specifically for CIR mixtures with bubble asphalt has not yet been established, and the procedure for plant cold recycled asphalt mixtures is currently being applied by extension. This study investigates the effects of laboratory compaction methods (Marshall compaction and Gyratory compaction) and curing temperatures (40°C to 60°C) on the volumetric properties and indirect tensile strength (ITS) of CIR mixtures with bubble asphalt. Depending on the reclaimed asphalt pavement (RAP) sources and the bubble asphalt content, the number of Gyratory compaction equivalent to 75 blows of Marshall compaction ranged from 15 to 43. Moreover, specimens cured at 60°C for 2 days exhibited 20% to 30% higher indirect tensile strength (ITS) compared to those cured at 40°C for 3 days. The findings highlight that laboratory compaction methods and curing conditions significantly affect the mechanical strength of CIR mixtures with bubble asphalt and must be considered in developing an appropriate mix design procedure for CIR mixtures.

Keywords
Aged asphalt pavement
Cold in-place recycling
Bubble asphalt
Compaction method
Curing condition
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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 :122-135
  • Received Date : 2025-06-13
  • Revised Date : 2025-06-22
  • Accepted Date : 2025-06-25
  • DOI :https://doi.org/10.22702/jkai.2025.15.1.12
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