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青藏公路多年冻土地区海拔高、气温低,裂缝是青藏公路沥青混凝土路面的主要破坏类型,沥青混合 料设计首先应考虑沥青和沥青混合料的低温抗裂性,其次是抗冻水稳性、抗老化性能和疲劳耐久性,高温性能是较 次要的。矿料选择时,需要考虑矿料的强度、抗冻性、级配和酸碱性,对于酸性矿料,应适当添加抗剥落剂,使集料与 沥青的粘附性不小于4级。沥青混凝土路面施工时应特别注意沥青用量、温度控制、保温措施、接缝和施工季节等, 以确保沥青混凝土路面的施工质量。
The permafrost regions of Qinghai-Tibet Highway have high altitude and low temperature, and cracks are the main types of failure of asphalt concrete pavement on Qinghai-Tibet Highway. Asphalt mixture design should first consider the low temperature crack resistance of asphalt and asphalt mixture, followed by anti-freeze water stability, Anti-aging performance and fatigue durability, high temperature performance is more important. Mineral material selection, the need to consider the strength of ore, frost resistance, grading and acid-base, for acidic ore, anti-stripping agent should be added appropriately, so that aggregate and asphalt adhesion of not less than 4. Asphalt concrete pavement construction should pay special attention to the amount of asphalt, temperature control, insulation measures, seams and the construction season, in order to ensure the construction quality of asphalt concrete pavement.