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选用多孔火山岩作为基体,聚乙二醇(PEG)作为相变材料,采用真空吸附的方法,将聚乙二醇吸附于多孔火山岩表面孔结构中,经环氧包封,制备出应用于冷拌沥青混合料中的相变粗集料;通过综合热分析仪对相变粗集料的储热性能进行表征,依据规范要求,对掺入了相变粗集料的相变冷拌沥青混合料的高温稳定性、水稳定性、路面降温效果进行评价。试验结果表明:相变粗集料的相变起始温度为42.8℃,相变焓为43.5J/g,压碎值为17.4%;掺入相变粗集料的冷拌沥青混合料,马歇尔稳定度为7.3kN,流值为3.9mm,TSR为82.4%;经室外温度测试,降低路面温度3.6℃左右。
Porous volcanic rocks were selected as the matrix. Polyethylene glycol (PEG) was used as the phase change material. Adopting the method of vacuum adsorption, polyethylene glycol (PEG) was adsorbed on porous volcanic surface pore structure. Phase change coarse aggregate in the asphalt mixture; the thermal storage performance of the phase change coarse aggregate was characterized by a comprehensive thermal analyzer; according to the specification requirements, the phase change cold mix asphalt mixture The high temperature stability, water stability, road cooling effect evaluation. The experimental results show that the initial phase transition temperature of phase change coarse aggregate is 42.8 ℃, the enthalpy of phase transformation is 43.5J / g and the crush value is 17.4%. The cold mix asphalt mixture with phase change coarse aggregate, The stability is 7.3kN, the flow value is 3.9mm and the TSR is 82.4%. After the outdoor temperature test, the road surface temperature is reduced by about 3.6 ℃.