Browsing by Author "Oliveira, Daniel V."
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Item Mortar-based systems for externally bonded strengthening of masonry(2014-10-21) de Felice, Gianmarco; De Santis, Stefano; Garmendia, Leire; Ghiassi, Bahman; Larrinaga, Pello; Lourenço, Paulo B.; Oliveira, Daniel V.; Paolacci, Fabrizio; Papanicolaou, Catherine G.; Tecnalia Research & InnovationMortar-based composite materials appear particularly promising for use as externally bonded reinforcement (EBR) systems for masonry structures. Nevertheless, their mechanical performance, which may significantly differ from that of Fibre Reinforced Polymers, is still far from being fully investigated. Furthermore, standardized and reliable testing procedures have not been defined yet. The present paper provides an insight on experimental-related issues arising from campaigns on mortar-based EBRs carried out by laboratories in Italy, Portugal and Spain. The performance of three reinforcement systems made out of steel, carbon and basalt textiles embedded in inorganic matrices has been investigated by means of uniaxial tensile coupon testing and bond tests on brick and stone substrates. The experimental results contribute to the existing knowledge regarding the structural behaviour of mortar-based EBRs against tension and shear bond stress, and to the development of reliable test procedures aiming at their homogenization/standardization.Item Round Robin Test for composite-to-brick shear bond characterization(2012-12) Valluzzi, Maria Rosa; Oliveira, Daniel V.; Caratelli, Angelo; Castori, Giulio; Corradi, Marco; De Felice, Gianmarco; Garbin, Enrico; Garcia, David; Garmendia, Leire; Grande, Ernesto; Ianniruberto, Ugo; Kwiecień, Arkadiusz; Leone, Marianovella; Lignola, Gian Piero; Lourenço, Paulo B.; Malena, Marialaura; Micelli, Francesco; Panizza, Matteo; Papanicolaou, Catherine G.; Prota, Andrea; Sacco, Elio; Triantafillou, Thanasis C.; Viskovic, Alberto; Zaja̧c, Boguslaw; Zuccarino, Gina; TRAZABILIDAD CIRCULAR; Tecnalia Research & InnovationThe paper presents the experience of a working group within the RILEM Technical Committee 223-MSC 'Masonry Strengthening with Composite materials', aimed at developing a standardized, reliable procedure for characterizing the bonding mechanism of masonry elements strengthened with composite materials under shear actions. Twelve laboratories from European universities and research centers were involved. Two different set-ups were compared, for single-lap and double-lap shear tests (the latter in two versions). Four kinds of fiber fabrics, i.e., glass, carbon, basalt and steel, were applied with epoxy resins (wet lay-up system) to clay brick units, for a total of 280 monotonic tests. The results provided information regarding the response of externally bonded-to-brick composites in terms of observed failure mechanisms, load capacity, effective transfer length, and bond shear stress-slip behavior. The test results of the 12 laboratories constitute a set of statistically representative data which may conveniently be used for setting appropriate design provisions and guidelines.