标题：GPR as a crack detection tool for asphalt pavements
作者：N. AHMAD*, M. WISTUBA and H. LORENZL
年度及期刊：2012 14th International Conference on Ground Penetrating Radar (GPR)
1 abstract
Cracking in asphalt pavement is a distresses often requiring urgent measures. GPR has been proved by numerous scientists as a fast and reliable asphalt pavement characterization tool. Whether GPR can be applied as a crack detection tool is a question to be answered. To find out the influencing parameters, e.g., crack fill, atmospheric condition, etc., GPR surveys were carried out on asphalt test pavements. Multiple techniques were used for data processing. Possibilities and limitations are documented.
crack fill, atmospheric condition: 裂缝填充和大气条件
2 overview
Cracks in asphalt pavement usually lead to water penetration in underneath layers thus causes weakening of supporting layers. Moreover, if water in crack freezes and melts again, the crack transforms into pot-hole, also reducing the driving comfort and traffic safety [9]. Visual crack detection is not practical because of complex crack’s structure, safety and hinder to traffic flow. The use of current crack detection methods in asphalt pavement such as (destructive) pavement coring, (non-destructive) video surveying, infrared technology, etc. is limited [1, 5, 6]. The limitations of above stated methods are time-consuming, cost, penetration ability into pavement, etc. [2].
Advantages of GPR such as rapid surveying, economical, and accuracy have been proven by many scientists in history [2, 6, 7]. GPR has been effectively deployed in the past for bridges and pavement characterization [7, 8]. GPR has been used by some scientists for crack detection and crack monitoring [2, 4, 8]. The main barrier for crack detection by GPR is the heterogeneous nature of asphalt. Bitumen (hydrocarbon), aggregates (lime stone, slag, etc.), sand and fines are used for asphalt pavements materials.
