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|Título:||Numerical simulation of the cone calorimetric tests on concrete samples with and without polypropylene fibres|
|Citação:||Piloto, P.A.G.; Mesquita, L.M.R.; Balsa, Carlos (2015) - Numerical simulation of the cone calorimetric tests on concrete samples with and without polypropylene fibres. In 3rd Ibero-Latin-American Congress on Fire Safety (CILASCI). Porto Alegre; Brasil|
|Resumo:||Reinforced concrete structures have adapted new types of concrete (high strength, self-compacting, etc.) presenting different thermo-mechanical behaviour, acquiring special importance the analysis of spalling. One of the most common procedures to minimize this failure event is the addition of polypropylene fibres to natural components, reducing the internal void pressure of the material, creating micro channels by the melting of fibres. The experimental study of concrete under fire conditions in general, and the development of new numerical models in particular, has allowed the assessment of complex phenomena to determine the thermal performance. This investigation studies the thermal performance of a two dimensional model, using nonlinear and transient finite element analysis. The experimental analysis is based on calorimetric test EN ISO 13927, using small-scale samples of concrete with dimensions 100x100x40 mm. In addition to the standard test procedure, normally used to determine the mass loss rate and the heat release rate, four thermocouples type k were positioned in different locations of the samples to measure nodal temperatures and an infrared thermography camera was used to evaluate temperature field in the lateral surface of each sample. A numerical simulation model was defined to evaluate the thermal performance of samples when submitted to different heat fluxes 35 and 75 kW/m2 and different level of fibres contents (0, 600 and 1200 g/m3). In order to validate the numerical model, small changes to standard test procedure were made. The temperature assessment used two experimental methods that were used for numerical validation. The numerical model has the limitation of predicting the motion of the moisture in the samples. It can also be concluded that addition of different amounts of polypropylene fibres has no significant effect on the heat release rate and on the thermal performance of the samples.|
|Aparece nas colecções:||ESTiG - Resumos em Proceedings Não Indexados à WoS/Scopus|
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