ABSTRACT
‘Green Overlays’ is a cost effective, minimal disruption, sustainable alternative to the wholesale demolition, removal and reconstruction of the existing concrete pavements.
A new mix design method for steel fibre reinforced, roller compacted, polymer modified, bonded concrete (SFR-RC-PMC) overlay has been developed. The mixes, suitable to be placed by an asphalt paver and compacted by a roller were characterized of high flexural and bond strengths with the substrate.
A relationship between stress and crack face opening displacement for steel fibre reinforced concrete beams under flexure was developed. The ‘bridging laws’ disclosed the mechanism of flexural strength for SFR-RC-PMC. The latter’s fibre efficiency was evaluated.
A new loading configuration for measuring Interfacial Fracture Toughness (IFT) for concrete overlay pavements was proposed. The IFT of a SFR-RC-PMC concrete beam, bonded on conventional concrete, undergoing flexure, was assessed.
A novel method for calculating the Strain Energy Release Rate at the interface of an overlaid pavement has been developed and published in a “sister” journal.
