The mechanism of different thermoregulation types of composite shape-stabilized phase change materials used in asphalt pavement

• Temperature thermoregulations were proposed to solve pavement temperature problems.
• Appropriate phase change temperature values were determined.
• Analyzed mechanism of the three thermoregulations phase change materials.
• Recommended composites mass proportion and corresponding enthalpy values.

Considered the temperature distress forms and the impacts of temperature on asphalt pavement, three temperature thermoregulations were proposed to solve the asphalt pavement temperature problems initiatively. Based on the properties of phase change thermoregulation agent, thermoregulation types of composite phase change materials (CPCMS) were studied and the values of appropriate phase change temperature were determined by differential scanning calorimetric (DSC) test. Results show that for high temperature thermoregulation, the phase change temperature range is 35–50 °C, in which with the 58# paraffin proportion increasing, the phase change enthalpy increases linearly and the phase change temperature grows exponentially. As for the low temperature thermoregulation, the phase change temperature range is −5 °C to 5 °C, in which with the Tetradecane proportion increasing, the phase change enthalpy grows linearly, while phase change temperature increases exponentially. In terms of the mixing temperature thermoregulation, the phase change temperature range is 5–35 °C, in which when Tetradecane mass ratio are fixed as 30%, 40%, and 50%, with the 58# paraffin proportion increasing, high temperature enthalpy grows and phase change temperature increases linearly; when 58# paraffin mass ratio are fixed as 30%, 40%, and 50%, with the Tetradecane proportion increasing, low temperature enthalpy grows approximate linearly, exothermic (endothermic) high phase change temperature decreases (grows) slight linearly. Finally, this paper recommends composites mass proportion to different thermoregulations types and the corresponding enthalpy values, which intends to solve the worldwide problem of temperature distresses in asphalt pavement in the future.