10 documents found, page 1 of 1
Effects of hygrothermal and natural aging on the durability of multilayer insul...
Parracha, João Luís; Veiga, Rosário; Nunes, Lina; Flores-Colen, InêsThis study evaluated the durability of three innovative multilayer insulation systems incorporating thermal mortars with EPS aggregates and silica aerogel granules after hygrothermal accelerated aging and one year of natural aging at an urban site in Portugal. The loss of performance was assessed after the accelerated aging and every three months of natural aging using non-destructive testing. Chemical-morpholo...
Effects of anobiid damage on shear strength parallel to the grain in single ste...
Lima, Daniel F.; Branco, Jorge M.; Parracha, João Luís; Machado, José S.; Nunes, LinaABSTRACT: Traditional carpentry joints can be found worldwide in many timber truss structures connecting rafter and tie beam. One failure mode of this connection result from shear in the tie beam beyond the notch either due to bad design or deterioration. In this article, the reduction in shear strength of Single Step Joints (SSJ) resulting from biological attack by anobiids was analysed. For this purpose, test...
Insulation Materials Susceptibility to Biological Degradation Agents: Molds and...
Nunes, Lina; Duarte, Sónia; Parracha, João Luís; Jones, Dennis; Paulmier, Ivan; Kutnik, MagdalenaInsulation materials are fundamental for decreasing energy losses and guaranteeing thermal and acoustic comfort in buildings, which may significantly contribute to decreasing the energy consumption related with poor thermal building conditions. These insulation materials should have a low susceptibility to biological degradation agents to decrease the risks of degradation of other construction materials, as wel...
Impact of Water-Repellent Products on the Moisture Transport Properties and Mou...
Roncon, Renata; Borsoi, Giovanni; Parracha, João Luís; Flores-Colen, Inês; Veiga, Rosário; Nunes, LinaExternal Thermal Insulation Composite Systems (ETICS) are constructive solutions widely used to increase the thermal insulation in new and retrofitted buildings. However, these systems can present several anomalies due to their constant exposure to weathering agents and anthropic factors. Water is generally the major cause of degradation. Thus, the application of water-repellent products can minimize the appear...
Cement-Bonded Particleboards with Banana Pseudostem Waste : Physical Performanc...
Nunes, Lina; Cintura, Eleonora; Parracha, João Luís; Fernandes, Bruno; Silva, Vitor; Faria, PaulinaThis article evaluates the relevant properties of cement-bonded particleboards (CBPB) made with a portion of maritime pine (Pinus pinaster) particles replaced with an agricultural waste, banana pseudostem (Musa sp.). The industrial production of CBPB was simulated in the laboratory based on a reference composition defined by a manufacturing company. Test specimens were produced assuming 0%, 25%, 50% and 75% par...
Assessment of the Density Loss in Anobiid Infested Pine Using X-ray Micro-Compu...
Parracha, João Luís; Pereira, Manuel; Maurício, António; Faria, Paulina; Lima, Daniel F.; Tenório, Marina; Nunes, LinaThe present study aims at evaluating the impact of anobiid damage on pine timber elements. Anobiid attack produces a diffuse damage of the elements with a set of tunnels in random directions and sizes, thus confusing quantification. Therefore, a method was developed based on X-ray micro-computed tomography (μ-XCT) to obtain, for naturally infested timber samples, an empirical correlation between lost material p...
Performance parameters of ETICS : Correlating water resistance, bio-susceptibil...
Parracha, João Luís; Borsoi, Giovanni; Flores-Colen, Inês; Veiga, Rosário; Nunes, Lina; Dionísio, Amélia; Gomes, M. Glória; Faria, PaulinaThe use of External Thermal Insulation Composite Systems (ETICS) significantly increased in the last decades due to their enhanced thermal properties, low installation cost and ease of application, not only in new constructions but also for thermal retrofitting of building facades. These multilayer rendering systems are constantly exposed to weathering agents and anthropic factors which can lead to physical-mec...
Effects of hygrothermal, UV and SO₂ accelerated ageing on the durability of ETI...
Parracha, João Luís; Borsoi, Giovanni; Veiga, Rosário; Flores-Colen, Inês; Nunes, Lina; Garcia, Ana R.; Ilharco, Laura M.; Dionísio, AméliaExternal Thermal Insulation Composite Systems (ETICS) have been extensively used for either new constructions or building facades retrofitting in the last decades. These systems can provide improved thermal performance to the building envelope. However, their long-term durability remains a pervasive concern, with some systems presenting relevant anomalies after few years from their application. The durability a...
Discussão de estratégias para a avaliação da biocolonização em ETICS : um caso ...
Borsoi, Giovanni; Parracha, João Luís; de Cooman, Quinten; Flores-Coles, Inês; Viegas, Cristina A.; Nunes, Lina; Moreira, Leonilde M.; Veiga, RosárioConservar e Reabilitar monumentos, edifícios e espaços são oportunidades únicas para fomentar a sustentabilidade dos territórios, constituindo-se o ENCORE 2020 - 4º Encontro de Conservação e Reabilitação de Edifícios numa ocasião ímpar para discutir os desafios da transformação no espaço construído: otimizar recursos, reutilizar materiais, melhorar a eficiência energética, repensar as centralidades urbanas, pro...
Evaluation of ETICS characteristics that affect surface mould development
Parracha, João Luís; Cortay, Armand; Borsoi, Giovanni; Veiga, Rosário; Nunes, LinaExternal Thermal Insulation Composite Systems (ETICS) are nowadays often used in new constructions but are also one of the most frequently used thermal retrofitting solutions for buildings. These systems have several advantages such as low installation cost, ease of application and increased thermal efficiency. Nevertheless, a number of questions have been raised on their long-time durability particularly relat...