素混凝土基层在道路大修工程中的应用研究

Study on Application of Plain Concrete Subgrade in Road Overhaul

在我国沥青路面大修工程设计中,对于基层强度不足的位置,常用的补强措施是对现有基层进行翻挖新建,以保证其具有足够强度。由于素混凝土具有养护时间短、早期强度高、整体性好的优点,所以通常采用其作为基层补强材料,但同时也存在刚度大、易产生反射裂缝等不足。现以上海市某主干路为研究背景,分析研究素混凝土在城市道路大修中的关键问题,明确了素混凝土板块出现断裂、沉陷的原因,提出了针对路基排水设计、路面结构设计的相应措施。

In the design of asphalt pavement overhaul projects in China, the commonly used reinforcement measures are to dig and reconstruct the existing subgrade for the position of insufficient strength subgrade toensure its sufficient strength. The plain concrete is usually used as the reinforcing material of subgrade because of its good advantages of short curing time, high early strength and good integrity, and but it also has some disadvantages of high rigidity, easy to produce the reflection crack and etc. Taking a main road in Shanghai City as the research background, the paper studies and analyzes the key problems of plain concrete in the overhaul of urban roads, makes clearly the causes of fracture and subsidence of plain concrete plate,and puts forward corresponding measures for design of subgrade drainage and design of pavement structure.