基于GPR的沥青路面早期水损害检测与性能评价

Early Water Damage Detection and Road Performance Evaluation of Asphalt Pavement Based on GPR

为了确定沥青路面早期水损害的位置,并进行路用性能评价,通过GPR无损检测技术,对沥青路面进行整体快速测试和局部加密测试,根据GPR谱图可以确定沥青路面的结构层状况,找出路面含水位置,并通过局部破损性试验验证该方法的合理性;通过构造深度、摩擦力系数、渗水系数和自主设计的耐磨性试验评价良好路面和水损害路面的路用性能。结果表明:采用车载和人工加密测试方法,结合GPR技术能快速准确识别沥青路面结构层含水区域;同时分别通过构造深度、摩擦力系数、渗水系数和耐磨性指标可以准确评价沥青路面水损害程度,其中耐磨性指标可以判别含水状态和唧浆状态。研究成果实现了沥青路面含水区域的无损检测,为路面早期水损害的预防和处治提供了理论基础和试验依据。

In order to determine the location of early water damage in asphalt pavement and evaluate the performance of pavement,through GPR non-destructive testing technology,the overall rapid test and local encryption test of asphalt pavement are carried out.According to GPR spectrum,the condition of structural layer of asphalt pavement could be determined,and the water-bearing position of pavement could be found out,the rationality of this method is verified by local damage test.The pavement performance of good pavement and water-damaged pavement are evaluated by texture depth,frictional parameter,water permeability coefficient and self-designed wear resistance test.The results show that the vehicle-based and manual encryption test methods can be used to quickly and accurately identify the water-bearing area of the asphalt pavement structure layer.The structural depth,friction coefficient,water permeability coefficient and wear resistance index can accurately evaluate the water damage degree of the asphalt pavement,wherein the wear resistance index can distinguish between a water state and a slurry state.The research results have achieved the non-destructive testing of the water-bearing area of asphalt pavement,which provides a theoretical basis and experimental basis for the prevention and treatment of early water damage on the pavement.