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Abstract
Fibre-reinforced polymer (FRP) systems have recently become popular in repairing concrete or masonry structures because of their inherent advantages. In spite of these benefits, FRPs have drawbacks having low fire resistance, poor environmental sustainability and incompatibilty with the substrate concrete. The effort to address these issues has led to the development of an emerging strain hardening cementitious (SHC) material using an inorganic polymer known as hybrid fibre-reinforced geopolymer (HFRG) composites. Compared with cement-based SHC composites, HFRG has better bond performance to concrete substrates, higher fire resistance, greater corrosion durability and helps to reduce CO2 emissions. This paper reviews the recent development of HFRG composites as an emerging repair material. Literature reveals that flowability of a fresh HFRG mixture decreases with increasing fibre content though still workable up to 2% fibre volume. Fibre synergy could result in 10–181% higher flexural toughness of geopolymer composites than when just using mono fibres. The application of HFRG composites to RC beams increased displacement ductility by to 263%. To date, there has been no reported field application of HFRG as a repair material though mono-fibre FRG has been field-applied as a strengthening material in large-diameter sewer RC pipes, RC culverts, RC sewerage manholes and dam surface improvement.
Highlights
Many existing buildings and bridges in Europe are in need for rehabilitation to enhance and extend their service performance and life
The present study has performed a review on the development of hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in strengthening concrete structures
Literature reveals as expected that the flowability of fresh HFRG mixtures decreases with increasing fibre content though workable mixes are reported up to 2% fibre volume
Summary
Many existing buildings and bridges in Europe are in need for rehabilitation to enhance and extend their service performance and life Retrofitting of these concrete and masonry structures and elements has traditionally used cement mortar patching or steel jacketing, the use of fibre-reinforced polymer (FRP) systems have recently become popular because of their inherent benefits. FRPs, derived from combining of fibre and organic polymer (i.e. epoxy), are known to perform better than traditional repair systems due to their high specific strength, relative ease and speed of application and high corrosion resistance The performance of such systems has been thoroughly investigated in the past decades and recently some in– situ applications have been reported [1,2]. Contribute in the development of effective FRG repair system guidelines and leading to their global acceptance
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