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Interfacial fracture toughness of composite concrete beams
Graphical abstract Display Omitted
Highlights Model was developed for interface fracture toughness of concrete overlaid pavements. Interfacial energy release rate determined by crack closure & nodal force technique. Composite beams will fail by fracturing of top layer; no interfacial delamination. Measured interfacial fracture toughness can become design guideline for overlays. ERR at interface, is sufficient, reliable to assess delamination in composite beams.
Abstract A test for measuring the interfacial fracture toughness of a bi-material interface, essentially for concrete overlaid pavements was developed. The measured interfacial fracture toughness of steel fibre-reinforced, roller-compacted, polymer modified concrete (SFR-RC-PMC) onto ordinary Portland cement concrete (OPCC) was found to be 52.0 J/m2 and 22.6 J/m2 for rough and smooth interfaces respectively. The experimental interfacial fracture toughness results can be suitable for the design of overlays on worn concrete pavements. In addition, the measured interfacial fracture toughness was used to predict the cracking trajectory of the composite beams under four-point bending (4 PB) tests. It was concluded that a single interfacial fracture parameter, the ERR (energy release rate) at interface, is an appropriate and sufficient parameter to assess the interfacial delamination performance of a composite beam under 4 PB flexure.
Interfacial fracture toughness of composite concrete beams
Graphical abstract Display Omitted
Highlights Model was developed for interface fracture toughness of concrete overlaid pavements. Interfacial energy release rate determined by crack closure & nodal force technique. Composite beams will fail by fracturing of top layer; no interfacial delamination. Measured interfacial fracture toughness can become design guideline for overlays. ERR at interface, is sufficient, reliable to assess delamination in composite beams.
Abstract A test for measuring the interfacial fracture toughness of a bi-material interface, essentially for concrete overlaid pavements was developed. The measured interfacial fracture toughness of steel fibre-reinforced, roller-compacted, polymer modified concrete (SFR-RC-PMC) onto ordinary Portland cement concrete (OPCC) was found to be 52.0 J/m2 and 22.6 J/m2 for rough and smooth interfaces respectively. The experimental interfacial fracture toughness results can be suitable for the design of overlays on worn concrete pavements. In addition, the measured interfacial fracture toughness was used to predict the cracking trajectory of the composite beams under four-point bending (4 PB) tests. It was concluded that a single interfacial fracture parameter, the ERR (energy release rate) at interface, is an appropriate and sufficient parameter to assess the interfacial delamination performance of a composite beam under 4 PB flexure.
Interfacial fracture toughness of composite concrete beams
Lin, Yougui (author) / Karadelis, John N. (author)
Construction and Building Materials ; 213 ; 413-423
2019-04-08
11 pages
Article (Journal)
Electronic Resource
English
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