沥青路面半刚性基层温度效应监测研究

Monitoring Research on Temperature Effect of Semi-rigid Base for Asphalt Pavement

为研究沥青路面半刚性基层的温度效应,建立了水泥稳定碎石室内温度变形试验方案和现场温度变形检测方案,通过温度应变系数来研究半刚性基层的室内温度变形特征,分析半刚性基层现场温度应变随季节变化规律,得到其施工完成初期温度变形特点.研究半刚性基层内不同位置现场温度应变系数的变化规律,得到半刚性基层的应变状态.结果表明:现场约束状态下半刚性基层横向温度应变系数比纵向温度应变系数大;沥青面层施工温度对半刚性基层应变产生重大影响,季节温度变化导致半刚性基层应变接近极限应变水平.

In order to research temperature effect of semi-rigid base for asphalt pavement, test scheme ot both indoor and field temperature deformation for cement stabilized macadam were established. Indoor temperature deformation characteristics of semi-rigid base was investigated through temperature strain co- efficient. Change rule of field temperature strain for semi-rigid base with seasonal variation was analyzed. Temperature deformation characteristics of early semi-rigid base was obtained. Change rule of field tem- perature strain factor for different position in semi-rigid base was studied, strain state of semi-rigid base were obtained. Results show that field transverse temperature strain factor is greater than field vertical temperature strain factor of semi-rigid base in field restrained condition. Strain of semi-rigid base close to limit value is led by seasonal temperature change.