藏区农村公路冷拌冷铺沥青混合料配合比设计方法

Method for Mix Proportion Design of Cold Mixed and Cold Laid Asphalt Mixture for Rural Roads in Tibetan Areas

摘要: 冷拌冷铺沥青混合料作为一种常温施工的绿色道路养护材料具有对环境污染小、可在常温下拌和与摊铺、适用温度范围广、成本低、便于储存运输等诸多优点，具有广阔的应用前景。本文基于旋转压实成型方法进行冷拌冷铺沥青混合料配合比设计，通过优选矿料级配组成、混合料初始及最终强度指标确定最佳沥青用量、混合料路用性能指标验证最终确定最优生产配合比。对于西藏高寒大温差地区，施工季节短，混合料降温快，拌合站距离施工地点远，热拌沥青混合料运至现场后已不能保证混合料的压实温度，因此基于旋转压实成型方法设计高品质的冷拌冷铺沥青混合料用于解决温度对混合料性能因素，对于藏区农村公路面层铺装具有重要的现实意义。

Abstract: Cold mixed and cold laid asphalt mixtures, as green road maintenance materials suitable for ambient-temperature construction, offer numerous advantages such as minimal environmental pollution, cold mixing and paving capabilities, wide applicable temperature ranges, low cost, and convenient storage and transportation, making them highly promising for practical applications. This study employs the rotational compaction method to design the optimal production mix ratio for cold mixed and cold laid asphalt mixtures. By optimizing aggregate gradation composition and determining the initial and final strength indicators of the mixture, the best asphalt content is identified. Subsequent verification of the mixture’s road performance indicators finalizes the optimal production mix ratio. For Xizang’s high-altitude, cold, and extreme temperature differential regions—where the construction season is short, mixtures cool rapidly, and mixing plants are far from construction sites—hot-mixed asphalt mixtures often fail to maintain adequate compaction temperatures upon arrival. Therefore, designing high-quality cold mixed and cold laid asphalt mixtures based on the rotational compaction method to address temperature-related performance factors holds significant practical importance for rural road pavement construction in Tibetan areas.