Preparation and Study of Phase Change Thermo-regulating Modified Asphalt
The asphalt and the asphalt mixture are typical thermo-sensitive materials,and high-temperature ruttings and low-temperature cracks of asphalt pavement are closely related to the temperature.The thermal sensitivity of asphalt pavement is a key factor affecting the service life and quality.Self-thermo-regulating pavement is a type of intelligent pavement with an active thermo-regulating function,which is characterized by heat absorption at high temperatures and heat release at low temperatures.Using polyethylene glycol(PEG)as the phase change energy storage material,this paper prepared phase change thermo-regulating microcapsules with PEG/graphite phase change material as the capsule core,and graphite/plasticized melamine resin as the wall material via the in-situ polymerization method microcapsule embedding technology.The asphalt was modified by prepared microcapsule at the dosages of 5％,10％,and 15％,and the results showed that this microcapsule can improve the high-temperature performance of asphalt,and the temperature difference of modified asphalt reached 1.9-5.6 ℃ under test dosages.
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