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泡沫沥青是高温沥青(140℃以上)遇到冷水滴(环境温度)产生的。当水遇到高温沥青时,发生热量传递,水会迅速蒸发,沥青产生泡沫,体积膨胀至原来的10至20倍。泡沫沥青大大增加了沥青的体积和表面活性,在发泡的过程中,沥青的粘度显著降低,从而使沥青能充分地扩散进骨料中去。由于对旧材料进行重复利用,在施工过程中,路面的几何线形及厚度能得到很好地保持。与其他路面修复技术相比,现场冷再生还能在一定程度上减少连续交通中断的现象。根据旧路调查和FWD弯沉测试结果,确定再生深度,形成了水泥全深度冷再生、泡沫沥青全深度冷再生和泡沫沥青再生旧路面层三种冷再生方案。在参考国内外冷再生技术研究成果的基础上,确定了稳定剂最佳剂量的选择方法,初步形成冷再生混合料的配合比设计方法。
Foam bitumen is produced by high temperature bitumen (above 140 ° C) encountered with cold water droplets (ambient temperature). When water encounters high-temperature bitumen, heat transfer occurs, water evaporates rapidly, the bitumen bubbles, and the volume expands to 10 to 20 times its original volume. Foam bitumen greatly increases the volume and the surface activity of the bitumen. During the foaming process, the viscosity of the bitumen decreases significantly, allowing the bitumen to fully diffuse into the aggregate. Due to the reuse of old materials, the geometric shape and thickness of the pavement can be well maintained during construction. Compared with other road repair technologies, the cold regeneration on site can reduce the continuous traffic interruption to a certain extent. According to the results of old road survey and FWD deflection test, the depth of regeneration was determined, and three cold regrowth schemes of full depth cold cement regeneration, full depth foam foam cold regeneration and foam asphalt regeneration were established. Based on the research results of cold regeneration technology both at home and abroad, the optimal dosage of stabilizer was determined and the design method of mixture ratio of cold recycled mixture was preliminarily established.