Keywords: concrete structures, bond strength, adhesion, mode–I fracture, contoured double cantilever beam, CDCB test, fibre reinforced concrete, FRC, durability, cracking, crack kinking, crack growth resistance, splitting, sustainable repairs, substrate repair interface, fracture analysis, optimisation, mortar, polyvinyl alcohol, PVA fibres
Towards sustainable repairs: substrate–repair interface mode–I fracture analysis
An experimental programme for the optimisation of concrete structural and non–structural repair was performed. The programme focused on the development of sustainable durable repairs throughout the enhancement of substrate–repair bond and compatibility, as well as the development of efficient solutions for crack control. As part of the programme, mode–I fracture characterisation of a substrate–repair interface was addressed. The repair material was a mortar reinforced with polyvinyl alcohol (PVA) fibres. Experimental tests, crack growth resistance analysis and major results are presented and discussed in this paper. Mode–I crack growth resistance tests were performed by means of the contoured double cantilever beam (CDCB) test. Tensile fracture analysis was supported by splitting (indirect) tension tests.