Environmental impact on critical responses of lightweight cellular concrete subbase flexible pavements

Author:

Oyeyi Abimbola Grace1ORCID,Al-Bayati Hanaa Khaleel Alwan2,Ni Frank Mi-Way3,Tighe Susan4

Affiliation:

1. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, Canada

2. Department Civil Engineering, University of Tikrit, Tikrit, Saladin Province, Iraq

3. Department of Civil Engineering, University of Florida, Gainesville, FL, USA

4. Department of Civil Engineering, McMaster University, Hamilton, ON, Canada

Abstract

Previous analytical studies have demonstrated that low-density lightweight cellular concrete (LCC) subbase pavements can support up to 20 times more traffic loads than unbound granular subbase pavements while protecting the pavement subgrade from adverse freeze–thaw effects in cold regions. This study examines the possibility of providing better-performing pavements on the field through the construction, instrumentation, and monitoring of flexible pavement sections incorporating three LCC densities (400, 475, and 600 kg/m³) as subbase material compared with unbound granular material in Canada. The effects of daily and seasonal temperatures on pavement critical responses to stress and strains were evaluated. The findings showed that these LCC pavements reduced asphalt concrete tensile strain by over two times compared with unbound granular pavements, and that strain increased with a daily temperature increase. Daily subgrade pressure (stress) change was reduced by up to 68%. The study concluded that longer life pavements could be achieved with LCC subbase thicknesses ≥250 mm.

Funder

Natural Sciences and Engineering Research Council of Canada

CEMATRIX (Canada) Inc

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

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