Centrifuge modelling of ultra-thin high strength steel fibre reinforced concrete pavements

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Authors

Smit, Martha S.
Kearsley, Elsabe P.

Journal Title

Journal ISSN

Volume Title

Publisher

ICE Publishing

Abstract

Ultra-thin continuously reinforced concrete pavement (UTCRCP) is an innovative pavement type that consists of a 50 mm high strength steel fibre reinforced concrete (HS-SFRC) layer overlain on a pavement substructure. The thickness results in a flexural stiffness significantly smaller than for conventional concrete pavements. In this paper, the conceptual understanding of the response of UTCRCP to traffic loading was investigated using centrifuge modelling. Simplified pavement models were subjected to a bidirectional moving axle load. The results indicated that axle loading, and not single wheel loading, should be used to investigate the response of UTCRCP as there is significant interaction in substructure deformation caused by the wheels on the ends of an axle. Due to the flexural toughness of the highly reinforced concrete layer, a gap forms between the ultra-thin HS-SFRC overlay and its substructure. Brittle, cemented bases between the HS-SFRC overlay and subgrade should be used with caution, as the flexible nature of the layers above and below the stabilised layer may result in rapid degeneration of the brittle layer.

Description

Keywords

Centrifuge modelling, Deformation, Pavements & roads, Ultra-thin continuously reinforced concrete pavement (UTCRCP), High strength steel fibre reinforced concrete (HS-SFRC), SDG-09: Industry, innovation and infrastructure

Sustainable Development Goals

SDG-09: Industry, innovation and infrastructure

Citation

Smit, M.S. & Kearsley, E.P. (2023) Centrifuge modelling of ultra-thin high strength steel fibre reinforced concrete pavements. International Journal of Physical Modelling in Geotechnics 23(1): 43–55, https://DOI.org/10.1680/jphmg.21.00011.