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.
