16 documents found, page 1 of 2
Experimental study on the fire resistance of all-composite and hybrid web-core ...
Proença, M.; Garrido, M.; Correia, J. R.; Sena-Cruz, JoséFibre-reinforced polymer (FRP) composites and polymeric foams used in construction are susceptible to elevated temperatures, but little is known about the behaviour of composite sandwich panels under fire exposure. This paper presents an experimental study on the fire resistance of web-core composite sandwich panels with polyurethane foam infill for building floors. Two panel variants were considered: (i) an al...
The effects of elevated temperature on the bond behaviour of sand coated GFRP b...
Rosa, I. C.; Firmo, J. P.; Correia, J. R.; Barros, Joaquim A. O.The use of glass fibre reinforced polymer (GFRP) bars as internal reinforcement of concrete structures has been growing, mainly due to the advantages they present over steel reinforcement, namely their low weight, high strength and corrosion resistance. However, at moderately elevated temperatures, especially when approaching the glass transition temperature (Tg) of the polymeric matrix (usually between 65 and ...
Multi-objective optimization of pultruded composite sandwich panels for buildin...
Garrido, Mário; Madeira, JFA; Proença, M.; Correia, J. R.Composite sandwich panels are being increasingly considered for civil engineering structural applications, offering high versatility in constituent materials and their geometrical arrangement. This translates to a high number of design variables, in addition to a potentially large number of design requirements and objectives related to the panels' functions. This paper presents an optimization study of a compos...
Durabilidade de perfis pultrudidos de GFRP em aplicações estruturais
Sousa, J.; Correia, J. R.; Cabral-Fonseca, S.Os materiais de matriz polimérica reforçada com fibras de vidro (GFRP) surgem como uma alternativa interessante às soluções tradicionais A comunicação proposta pretende contribuir para aumentar o conhecimento sobre a durabilidade de elementos estruturais de GFRP em condições de serviço, através da avaliação de um caso de estudo onde foram utilizados dois tipos de perfis (I100 e I150) de GFRP pultrudidos. A estr...
Desenvolvimento de um sistema de inspeção e diagnóstico para estruturas em perf...
Castelo, A.; Cabral-Fonseca, S.; Brito, J.; Correia, J. R.Na presente comunicação, apresentam-se os primeiros desenvolvimentos de um sistema de inspecção e diagnóstico para estruturas em perfis pultrudidos de polímero reforçado com fibras de vidro (GFRP, do inglês, glass fibre reinforced polymer). Em particular, é apresentado o sistema classificativo das anomalias que podem ocorrer em estruturas de perfis de GFRP, agrupadas de acordo com o seu aspecto visual. São tamb...
Effects of thermal cycles on the mechanical response of pultruded GFRP profiles...
Sousa, J.; Correia, J. R.; Cabral-Fonseca, S.; Diogo, A.This paper presents a literature review and results of an experimental study about the effects of thermal cycles on the physical and mechanical properties of pultruded glass fibre reinforced polymer (GFRP) profiles used in civil engineering structural applications. The GFRP profiles used in this study present similar fibre architecture, differing only in their matrix nature: unsaturated polyester and vinylester...
Degradação ambiental de perfis pultrudidos de GFRP constituídos por matriz de p...
Correia, J. R.; Cabral-Fonseca, S.; Carreiro, A.; Costa, R.; Rodrigues, M. P.; Eusébio, M. I.; Branco, F.Neste artigo apresentam-se os resultados preliminares de um projeto de investigação em curso, cujo objectivo é analisar os efeitos de diferentes agentes de degradação ambiental (água, solução salgada, condensação em contínuo, nevoeiro salino, ciclos térmicos e radiação ultravioleta) nas propriedades físico-químicas e no desempenho de perfis putrudidos de polímeros reforçados com fibras de vidro (GFRP) constituí...
Artificial accelerated ageing of GFRP pultruded profiles made of polyester and ...
Cabral-Fonseca, S.; Correia, J. R.; Rodrigues, M. P.; Branco, F.This article presents results of experimental investigations on the durability of glass-fibre-reinforced polymer (GFRP) pultruded profiles exposed to typical environments of civil engineering applications.
Durability of the adhesion between bituminous coatings and self-protection mine...
Marques, J. A.; Lopes, Jorge; Correia, J. R.Flat roofs in current buildings include a waterproofing system, often made of bituminous membranes with a self-protection constituted by mineral granules. These granules constitute the barrier against the fundamental environmental agent of degradation, the UV radiation. Therefore it is of paramount importance to understand the long-term performance of the self-protection layer, namely its adhesion to the coatin...
Dimensional stability of waterproofing bituminous sheets used in low slope roofs
Grandão Lopes, J.; Correia, J. R.Lap joints between waterproofing bituminous sheets, applied in either single or multiple layers, are one of the most critical areas of roofs, especially when the waterproofing systems comprise only a single sheet. In fact, the way how lap joints are executed is highly associated with the occurrence of anomalies in such systems. With this regard, the dimensional stability of the sheets is one of their most impor...