Abstract
ABSTRACT In this study, a phase change material microcapsule was produced by using cenospheres as the microcapsule shell, polyethylene glycol 2000 as the phase change material, and silica sol as the sealing material. The produced CenoPCM microcapsule was analyzed using scanning electronic microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The thermal properties and stability of the CenoPCM were evaluated using differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and a thermal cycling test. The results showed that the phase change temperature and enthalpy of the CenoPCM were 55.7°C and 101.4 J/g, respectively, with a mass loss of 2.35% at 200°C. After 200 thermal cycles, the mass change remained stable at 2.05%. An outdoor test was conducted to assess the impact of CenoPCM on the thermal performance of asphalt mixtures. In comparison with conventional asphalt mixture specimens, the maximum temperature differences at depths of 2, 5, and 8 cm below the surface of the phase change asphalt mixture specimens were 4.9°C, 6.4°C, and 5.9°C, respectively. Finally, the influence of CenoPCM on the performance of asphalt mixtures was evaluated, revealing a promising future for its use in asphalt pavements.
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