PURPOSES : There has been increasing interest in South Korea on warm-mix asphalt (WMA) and cold-mix asphalt (CMA) technologies that allow production of asphalt pavement mixtures at comparatively lower temperatures than those of hot-mix asphalt (HMA) for use in pavement engineering. This study aims to evaluate the feasibility of replacing HMA pavement with WMA pavement with the goal of reducing CO2 emissions associated with asphalt production for road construction. METHODS : Changes in the dynamic modulus characteristics of WMA and HMA according to short-term and long-term aging were evaluated. In addition, the effects of water damage were evaluated for short- and long-term aging stages. RESULTS : For WMA, in the process of mixing and short-term aging, early-age dynamic modulus decreased owing to low temperature and reduced short-term aging (STA) time. This could result in early damage to the asphalt pavement depending on the applied traffic load and environmental load. CONCLUSIONS : Mastercurves of the dynamic modulus were used for comparative analysis of WMA and HMA. Compared to the dynamic modulus after STA of HMA, the estimated aging time determined by experiments for WMA to achieve the required stiffness was more than 48 hours, which is equiva-lent to approximately 4 to 5 years real service life when converted. It is considered that further studies are needed for performance optimization to achieve early-age performance of the asphalt mixes.

1. Introductuon
2. Materials and Mix Design
    2.1. Materials
    2.2. Mix Design
    2.3. Fabrication of Specimens
3. Experimental Program
    3.1. Aging Method
    3.2. Moisture Damage Method
    3.3. Dynamic Modulus Test
4. Dynamic Modulus Test Results
5. Analysis of Test result
    5.1. Analysis of changes in dynamic modulus withaging and moisture conditioning
    5.2. Dynamic modulus mastercurve of HMA andWMA with aging time
6. Conclusions
ACKNOWLEDGMENTS

• Jongwon Lee(Member · Korea Institute of Civil Engineering and Building Technology) | 이종원
• Sung Lin Yang(Member · Korea Institute of Civil Engineering and Building Technology) | 양성린
• Hee Beom Park(Member · Korea Institute of Civil Engineering and Building Technology) | 박희범
• Cheolmin Baek(Member · Korea Institute of Civil Engineering and Building Technology) | 백철민 Corresponding Author