黑龙江交通科技

为解决高温导致沥青路面塑性变形及低温裂缝问题，依托汾阳—石楼高速K0+000～K30+330段，研究了相变材料（PCM）改性沥青路面的热-力耦合响应。通过差示扫描量热与热重分析表征石蜡基PCM相变温度、相变潜热、导热系数等热物性；采用熔融-高剪切法制备3%、5%、7%、9%四种PCM掺量的PCM–SBS改性沥青，并结合扫描电镜和分离率测试确定质量分数5%掺量下微胶囊分散最均匀。基于此，构建了潜热源项的非稳态热传导模型及Prony序列黏弹本构，采用有限元方法模拟分析了夏季、春季与冬季温度场及高温荷载叠加下的应力-应变分布。结果表明，质量分数5%PCM改性可使面层昼间峰值温度降低约3.2℃，热缩应力与合成主应力分别降低约22%、20%，累积塑性应变减少约19%，显著提升高温抗车辙与低温抗裂性能。

In order to solve the problems of plastic deformation and low-temperature cracking of asphalt pavement caused by high temperature, the thermal-force coupling response of Phase Change Material(PCM) modified asphalt pavement was investigated by relying on the section of Fenyang-Shilou Expressway from K0+000 to K30+330. The thermophysical properties of paraffin-based PCM such as phase change temperature, latent heat of phase change, thermal conductivity, etc. were characterised by differential scanning calorimetry and thermogravimetric analysis; four types of PCM-SBS-modified asphalt with PCM dosage of 3%, 5%, 7% and 9% were prepared by the melt-high shear method, and combined with scanning electron microscopy and Separation rate test to determine the most uniform dispersion of microcapsules at 5% doping of mass fraction. Based on this, the unsteady heat conduction model of latent heat source term and Prony series viscoelastic principal structure were constructed, and the stress-strain distribution under the superposition of temperature field and high temperature load in summer, spring and winter was simulated and analyzed by finite element method. The results show that the mass fraction of 5% PCM modification can reduce the peak daytime temperature of the surface layer by about 3.2℃, the heat shrinkage stress and the synthetic principal stress by about 22% and 20%, respectively, and the cumulative plastic strain by about 19%, which significantly improves the high-temperature rutting resistance and low-temperature cracking resistance.