Last month, the NRRA hosted a “Research Pays Off” series webinar on full-scale load testing of permeable interlocking concrete pavement (PICP) by the University of California Pavement Research Center (UCPRC) in Davis. Click here to hear the hour presentation by Dave Jones, Ph. D. Associate Director of UCPRC. His presentation summarized research conducted in 2014 to revise PICP subbase thickness design tables published by ICPI in 2011. The study included:
- A literature review
- Field deflection testing of existing projects and test sections
- Estimation of the effective stiffness of each layer in PICP structures
- Mechanistic analysis and structural design of a test track incorporating three different subbase thicknesses
- Tests on the track with a Heavy Vehicle Simulator to collect performance data to validate the design approach using accelerated loading
- Refinement and calibration of the design procedure using the test track data
- Development of a spreadsheet based design tool, and;
- Development of revised subbase thickness design tables using the design tool.
At the conclusion of the presentation, ICPI’s Technical Director David R. Smith noted that the UCPRC design tables were published in the 5th Edition of ICPI’s PICP manual, in a national design standard called ASCE/ANSI 68-18 Permeable Interlocking Concrete Pavement, and by Caltrans in their design guide for pervious pavement. The research was funded by the ICPI Foundation for Education & Research, the Concrete Masonry Association of California and Nevada, and the California Nevada Cement Association. The complete research report on which the webinar is based can be downloaded here.