Browsing by Author "Pinto, T."
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- Decomposition of intumescent coatings: comparison between numerical method and experimental resultsPublication . Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Passive fire protection materials insulate steel structures from the effects of the elevated temperatures that may be generated during fire. They can be divided into two types, non-reactive, of which the most common types are boards and sprays, and reactive, being intumescent coatings an example. They are available as solvent or water based systems applied up to approximately 3[mm]. One problem associated with the use of such systems is the adhesion of the charred structure to the steel element during fire and upon it. It is very important that the char remains in the steel surface to insure the fire protection.
- Decomposition of intumescent coatings: comparison between numerical method and experimental resultsPublication . Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.An investigation of two different intumescent coatings used in steel fire protection has been performed to evaluate their efficiency. A set of experimental tests is presented. They were conducted in a cone calorimeter, considering different thicknesses and heat fluxes. Among other quantities, the steel temperature and the intumescence thickness variation were measured. A numerical model for the paint decomposition is also presented. Based on the intumescence experimental value, the model is able to provide a reasonably good prediction of the steel temperature evolution.
- Determinação da conductividade térmica efectiva de tintas intumescentesPublication . Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Este trabalho apresenta um estudo experimental e numérico efectuado em placas de aço protegidas com tinta intumescente e sujeitas a um fluxo de calor radiante proveniente de um calorímetro de cone. A variação da temperatura em ambas as faces da placa é obtida através de termopares do tipo k soldados à placa. Os resultados permitem caracterizar o comportamento térmico do intumescente, estimar a expansão volumétrica e a taxa de perda de massa. O método das diferenças finitas é utilizado para resolver o problema inverso, determinar a condutividade térmica efectiva e a temperatura à superfície do intumescente.
- Numerical estimation for intumescent thermal protection using one-dimensional IHCPPublication . Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Intumescent coatings are an important group of passive fire protection materials, representing about one third of steel fire protection costs. This insulating system is made of four different chemical compounds that can be classified as: a carbonisation agent, an acid source, a foaming agent and a catalyst. When protecting a steel structure under fire conditions, the intumescent paint is heated, beginning to melt, to bubble and to swell, forming a multi-cellular barrier which decreases the heat transfer from the fire to the substrate. The film behaviour is characterized by an expansion and mass loss, producing a foam char with a geometry that varies from 5 to 200 times its original volume. In order to design this type of protection, the intumescence physical and thermal behaviour must be acknowledged, being the thickness and the effective thermal conductivity the key parameters during this process.