沥青混合料压实度-振动加速度-温度关系模型

Relational Model of Compactness-Vibration Acceleration-Temperature of Asphalt Mixture

将抚吉高速公路作为试验路段,基于质量弹簧阻尼耦合模型,构建了振动压路机振动轮被压材料系统动力学模型,开发了沥青混合料振动压实实时分析检测系统.以现场实测沥青混合料摊铺—碾压过程的温度分布为基础,构建了AC-20、AC-25、ATB-25沥青混合料的压实度振动加速度温度关系模型.结果表明:振动压路机振动轮垂直加速度与被压沥青材料刚度成正比,与其阻尼成反比;沥青混合料压实度与振动加速度有效值呈线性关系;AC-25沥青混合料压实度振动加速度温度关系模型的相关性系数R2为0.99,压实度计算值与实测值的差值介于-3.0%~1.4%.

Relying on Fuji Highway,a system dynamics model of vibration wheel of vibratory roller-compressed materials was established on the basis of mass-spring-damping coupling model,and the real-time analysis and detection system of vibration compaction of asphalt mixture was developed.Based on the field measurement of temperature distribution of asphalt mixture during paving and rolling process,the relational model of compactness-vibration acceleration-temperature of AC-20,AC-25 and ATB-25 asphalt mixture was established.The results show that the vertical acceleration of vibration wheel of vibratory roller is proportional to the stiffness of the compressed asphalt material and inversely proportional to the damping.The compactness of asphalt mixtures shows quite good linear relationship with vibration acceleration virtual value.The correlation coefficient square of the compactness-vibration acceleration-temperature relational model of AC-25 is 0.99,and the difference between the calculated value and the measured value of compactness is-3.0%1.4%.