Use of a Variable Energy Penetrometer and Geo-Endoscopic Imaging in the Performance Assessment of Working Platforms Constructed with Large Size Unconventional Aggregates

Hasan Kazmee, Erol Tutumluer, Younes Haddani, Miguel A. Benz Navarrete, Roland Gourves

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Transportation agencies commonly use large size aggregates, often referred to as rock cap or aggregate subgrade, e.g., by Illinois Department of Transportation (IDOT), for stabilizing weak subgrades at wet of optimum moisture states. Adequate characterization of these large rocks is not possible in the laboratory with the use of standard tests. Accordingly, a cone penetration based strength index is the best field assessment tool since shear strength profile is closely linked to unbound aggregate or aggregate subgrade layer performance. To this end, an innovative variable energy dynamic cone penetration (DCP) device, popularly known as PANDA in France, was utilized in a recent Illinois Center for Transportation (ICT) research study involving the performance assessment of large size aggregates over soft subgrades. Twelve full scale working platform sections were constructed with six different types of virgin and recycled large size aggregate materials. Accelerated pavement testing (APT) was carried out on these sections to monitor the rutting progression with number of passes of a certain wheel load assembly. To evaluate layer properties and adequately relate them to rutting performance, PANDA tests were conducted along with traditional DCP soundings on the loading applied pavement test section centerlines. A geo-endoscopic probe was also used in the holes opened by the PANDA tests to identify layer interfaces and visually document subsurface moisture conditions. The PANDA and geo-endoscopy testing has proven very beneficial in the performance assessment of the large size aggregate subgrade materials under simulated traffic loading. This paper presents current detailed technical knowledge on the PANDA and geo-endoscopy test equipment and highlights field results associated with the recent ICT project soundings conducted in the pavement working platform test sections.

Original languageEnglish (US)
Title of host publicationInternational Conference on Transportation and Development 2016
Subtitle of host publicationProjects and Practices for Prosperity - Proceedings of the 2016 International Conference on Transportation and Development
EditorsKelvin C. P. Wang
PublisherAmerican Society of Civil Engineers (ASCE)
Pages1227-1238
Number of pages12
ISBN (Electronic)9780784479926
DOIs
StatePublished - Jan 1 2016
EventInternational Conference on Transportation and Development 2016: Projects and Practices for Prosperity - Houston, United States
Duration: Jun 26 2016Jun 29 2016

Publication series

NameInternational Conference on Transportation and Development 2016: Projects and Practices for Prosperity - Proceedings of the 2016 International Conference on Transportation and Development

Other

OtherInternational Conference on Transportation and Development 2016: Projects and Practices for Prosperity
CountryUnited States
CityHouston
Period6/26/166/29/16

Keywords

  • Accelerated pavement testing.
  • Aggregate subgrade
  • Geoendoscopy
  • Large size aggregate
  • Variable energy penetration testing
  • Working platform

ASJC Scopus subject areas

  • Transportation
  • Civil and Structural Engineering
  • Mechanics of Materials
  • Safety, Risk, Reliability and Quality
  • Geography, Planning and Development

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