Flexible pavement quality assurance using ground penetrating radar

Zhen Leng, I. Al-Qadi

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

4 Citations (Scopus)


To produce a high-quality and long-lasting pavement, quality assurance (QA) is critical. For flexible pavements, layer thickness and in-situ density are the two most important characteristics to monitor. This paper presents the successful application of ground penetrating radar (GPR) to nondestructively and continuously measure asphaltic layer thickness and density. Ground penetrating radar surveys were conducted at a five-lane full-scale test site. Each lane is composed of four sections with the same asphaltic mixture but different densities. The GPR signal reflection was used to predict the layer thickness profile. Specific gravity models developed in an earlier study were utilized to predict the asphalt mixture density profile. The GPR-predicted thickness and density were compared to the core-measured values. Results showed that GPR achieved an average relative error of 4.9% in layer thickness measurement without using calibration cores and an average relative error of 2.6% in asphalt mixture bulk specific gravity using one calibration core.
Original languageEnglish
Title of host publicationT and DI Congress 2011
Subtitle of host publicationIntegrated Transportation and Development for a Better Tomorrow - Proceedings of the 1st Congress of the Transportation and Development Institute of ASCE
Number of pages11
Publication statusPublished - 2 May 2011
Externally publishedYes
Event1st Congress of the Transportation and Development Institute of ASCE - Chicago, IL, United States
Duration: 13 Mar 201116 Mar 2011


Conference1st Congress of the Transportation and Development Institute of ASCE
Country/TerritoryUnited States
CityChicago, IL


  • Flexible pavements
  • Quality control
  • Radar

ASJC Scopus subject areas

  • Transportation
  • Geography, Planning and Development

Cite this