Sensitivity of the Specific Heat Capacity of Asphalt Concrete to Mixture Constituents and Conditioning Temperatures
78th RILEM Annual Week & RILEM International Conference on Sustainable Materials & Structures: Meeting the major challenges of the 21st century - SMS 2024, Toulouse, Fransa, 25 - 30 Ağustos 2024, ss.513-520, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Toulouse
- Basıldığı Ülke: Fransa
- Sayfa Sayıları: ss.513-520
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Evet
Özet
The specific heat capacity is a fundamental but difficult-to-measure thermal property for evaluating the thermal-related distresses of asphalt concrete. This study aims to develop an improved yet reliable calorimetry setup for measuring the specific heat capacity based on the steady-state principle. 12 mixtures with the Superpave method are designed utilizing two aggregate sources, two maximum aggregate sizes, and three air void contents. Samples are conditioned at -2, 20, and 40 °C to investigate the conditioning temperature effect by monitoring the heat transfer rate between the samples and the water medium at 50 °C. At the thermal equilibrium, the specific heat capacity is calculated based on the energy conservation law using the sample’s final temperature and weight. The results indicate that the mixture constituents significantly influence the specific heat capacity. The time to reach equilibrium also depends strongly on the conditioning temperature, representing the thermal gradient between the sample and the water medium. A lower specific heat capacity with delayed equilibrium time is measured at a higher thermal gradient, indicating a rate-dependent characteristic of the heat transfer. It is expected that the findings can help to optimize the asphalt mixture properties to achieve better performance under difficult environmental conditions.