Abstract:
Ultra-Thin Continuously Reinforced Concrete Pavement (UTCRCP) consists of a 50 mm thin High-
Strength Steel-Fibre-Reinforced Concrete (HS-SFRC) overlay placed on existing pavements as
rehabilitation or used as part of new pavements. Difficulties have been experienced with the
construction of UTCRCP. Additionally, the thin HS-SFRC has superior fatigue properties, but
poor load-spreading ability compared to conventional concrete pavements due to its reduced
thickness. This results in high deflections when the pavement is loaded. The substructure
of UTCRCP plays an important role in its performance. Cement-stabilised granular materials
can be used to ensure gradual load spreading with depth, but its behaviour under flexible
concrete layers is not yet well understood. In this study the effect of increasing the HS-SFRC
layer thickness and the effect of incorporating cement-stabilised base layers were investigated
using linear elastic finite element modelling. From stress levels calculated, it was found that C1
and C2 materials perform well underneath a 50 mm HS-SFRC layer subjected to standard axle
loads of 80 kN, while C3 and C4 would deteriorate faster. Stabilised layers placed below a thin,
flexible concrete layer may however crack, resulting in increased damage to supporting layers. It
is recommended that the response of UTCRCP should be investigated using advanced material
models for the cement-stabilised base and other substructure layers.
