沥青混合料介电特性与沥青含量研究

Study on Dielectric Properties and Asphalt Content of Asphalt Mixture

为建立探地雷达检测沥青含量方法,进行不同油石比的沥青混合料介电常数测试实验.根据矿料及沥青介电常数等参数,采用Rayleigh模型推导混合料沥青含量计算公式.结果表明,不同沥青含量的混合料介电常数不相同,且其介电常数随沥青含量的增大而减小;采用Rayleigh模型推导的沥青含量公式计算结果与室内合成混合料燃烧法测定结果平均误差在4%以内,精度较高,满足室内测定的要求;而在实际工程验证中,虽然计算结果与实际路面钻芯取样燃烧法测定结果相差较大,但为检测道路摊铺均匀性等方面提供理论基础.

In order to establish a new method for detecting asphalt content by ground penetrating radar,dielectric constant test experiments of asphalt mixtures with different oil-stone ratios were carried out..According to the parameters of mineral aggregate and asphalt dielectric constant,Rayleigh model was adopted to derive the asphalt content calculation formula of the mixture.The results show that the dielectric constants of the mixtures with different asphalt contents are different,and the dielectric constants decrease with the increase of asphalt content.The average error between the calculation result of asphalt content formula deduced by Rayleigh model and the measurement result of indoor synthetic mixture combustion method is less than 4%,with high accuracy,meeting the requirements of indoor measurement.However,in the actual engineering verification,although the calculation results are quite different from the results measured by the actual road core drilling sampling combustion method,it provides a theoretical basis for the detection of road paving uniformity and other aspects.