Bueno Moises, Kakar Muhammad Rafiq, Refaa Zakariaa, Worlitschek Jörg, Stamatiou Anastasia, Partl Manfred N
Empa, Swiss Federal Laboratories for Material Science and Technology, CH-8600, Dübendorf, Switzerland.
Chalmers University of Technology, Gothenburg, SE-412 96, Sweden.
Sci Rep. 2019 Dec 30;9(1):20342. doi: 10.1038/s41598-019-56808-x.
Phase change materials (PCMs) may be used to regulate the temperature of road surfaces to avoid low-temperature damages when asphalt materials become brittle and prone to cracking. With this in mind, different asphalt mixtures were modified with microencapsulated phase change materials (i.e. tetradecane) to assess their thermal benefits during the phase change process. Likewise, the effect on the mechanical performance of PCMs as a replacement of mineral filler was assessed. Special attention was paid to dry and wet modification processes for incorporating the PCMs into the mixtures. The results showed that PCM modifications are indeed able to slow down cooling and affect temperatures below zero. Approximately, a maximum of 2.5 °C offset was achieved under the tested cooling conditions compared to the unmodified reference specimens. Regarding the mechanical response at 0 °C and 10 °C, the results indicated that the PCM modification significantly reduces the stiffness of the material in comparison with the values obtained for the reference mixture.
相变材料（PCMs）可用于调节路面温度，以避免在沥青材料变脆并易于开裂时出现低温损坏。考虑到这一点，用微胶囊化相变材料（即十四烷）对不同的沥青混合料进行改性，以评估它们在相变过程中的热效益。同样，还评估了将相变材料作为矿物填料替代品对力学性能的影响。特别关注了将相变材料掺入混合料的干法和湿法改性工艺。结果表明，相变材料改性确实能够减缓冷却速度并影响零下温度。与未改性的参考试样相比，在测试的冷却条件下，最大偏移量约为2.5°C。关于在0°C和10°C时的力学响应，结果表明，与参考混合料获得的值相比，相变材料改性显著降低了材料的刚度。
