Title:
Bond of FRP and NSM Bars to Alkali-Activated Mortar Combining Blast Furnace Slag and Waste Glass
Author(s):
Ivana Krajnovic
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/24/2024
Abstract:
The use of fiber reinforced polymers (FRPs) as concrete reinforcement is a good alternative amongst other in places where corrosion of steel is eminent, , or where non-conductivity is of importance. Furthermore, over the last 30 years, FRPs became the state-of-the-art materials for strengthening and seismic retrofitting of concrete and masonry structures. Near surface mounted (NSM) FRPs is one of the techniques for structural repair of deficient concrete elements. It usually comprises of high-strength FRP rebars made of carbon, alkali-resistant (AR) glass, basalt, aramid and typically bonded with organic epoxy resin. Utilization of epoxy comes with certain drawbacks like inability to be applied on wet surfaces, lack of gas permeability, low performance under fire and high costs, that more and more researchers are exploring utilization of inorganic materials like Portland cement (PC) or alkali-activated materials (AAMs). AAMs are emerging as a future-proof technology in the palette of more eco-friendly concrete production technologies, as they combine utilization of industrial by-products and omission of Portland cement clinker, maximizing environmental benefits of structures. Bond between FRPs and inorganic system is crucial factor for combination of these two systems either in reinforced concrete structures or for strengthening purposes. The purpose of this research is to check the potential usage of previously developed AAM with FRP rebars in structural and strengthening applications, by focusing in this study on the bond behavior between FRP and different inorganic matrixes. The verification of bond properties of the AAM with glass FRP (GFRP) and carbon FRP (CFRP) bars are evaluated through pull-out rebar test and modified NSM pull-out test. Two bond lengths are considered. Comparison with PC mortar mix for most of the performed pull-out tests is presented as well.