Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structuresErnesto Guades, Henrik Stang, Gregor Fisher and Jacob SchmidtMATEC Web Conf., 289 (2019) 04003DOI: https://doi.org/10.1051/matecconf/201928904003