城市水泥混凝土路面白改黑设计要点分析

Analysis on Design Essentials of Cement to Asphalt for Urban Cement Concrete Pavement

近年来,许多城市在老城区水泥混凝土路面上加铺沥青面层,将其改造成低噪声、平整度和舒适性等使用性能更优的沥青混凝土路面,俗称“白改黑”。白改黑路面在使用过程中常出现反射裂缝。迄今为止,国际上对反射裂缝的问题还没有真正解决[1]。因此,如何有效抑制和延缓反射裂缝对白改黑设计具有重要意义。通过分析水泥混凝土路面白改黑后反射裂缝的类型、形成机理和处治措施,并以西安市某区城市道路白改黑项目为例,进行实践检验,取得良好效果,可为以后类似工程提供参考。

In recent years,the asphalt surface layer is paved on the cement concrete pavement of old urban areas in many cities,which can reconstruct it into the asphalt concrete pavement with the more excellent usability of low noise,smoothness and comfort,commonly known as"white to black".The reflective cracks often appear in the“white to black”pavement during use.So far,the international problem of reflection crack has not been really solved.Therefore,how to effectively inhibit and delay the reflection crack is of great significance in the design of“white to black”.The types,formation mechanism and treatment measures of reflective cracks after the "white to black"of cement concrete pavement are analyzed.Taking an urban road“white to black”project in Xian as an example,the practice test is carried out to achieve the good results,which can provide reference for similar projects in the future.