Encontrados 166 documentos, a visualizar página 1 de 17
Betões de elevado desempenho com nano-partículas de TiO2 e cinzas volantes : re...
Martins, Tiago Manuel da Rocha; Aguiar, J. L. Barroso de; Jesus, Carlos M. G.; Torgal, Fernando PachecoOs betões de elevado desempenho apresentam vantagens várias sobre os betões correntes nomeadamente elevada resistência e durabilidade. Estes materiais permitem a execução de estruturas com menor quantidade de aço e com uma vida útil superior, fatores cruciais para a eco-eficiência daquelas. Apesar disso as publicações sobre betões com nano-partículas são escassas, representando apenas 1% do total de publicações...
Introduction to the environmental impact of construction and building materials
Torgal, Fernando Pacheco“Woodhead Publishing series in civil and structural engineering, nr. 49” ; Earth's natural resources are finite and face increasing human pressure. Over the last few decades, concern has been growing about resource efficiency and the environmental impact of material consumption. The construction industry is responsible for the consumption of a relevant part of all produced materials, however, only recently has...
High temperatures behaviour of mortars with incorporation of phase change mater...
Cunha, Sandra; Carneiro, Luis Filipe Costa Gondar; Aguiar, J. L. Barroso de; Torgal, Fernando Pacheco; Ferreira, Victor; Tadeu, AntónioIn a society increasingly concerned with sustainability and good construction practices, it becomes urgent to develop and study the behaviour of the materials when submitted to the unfavourable conditions. Mortars are extensively used in building. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside buildings, contributing to the thermal comfort and ...
Resíduos de construção e demolição (RCD) : enquadramento e breves considerações...
Torgal, Fernando PachecoA reciclagem de RCD é um tema de grande actualidade a que urge dar resposta urgente com vista ao aumento substancial das modestas taxas de reciclagem actuais. O presente artigo analisa de forma sucinta o enquadramento geral desta temática colocando em evidência a questão da localização óptima das estacões de reciclagem de RCD e da necessidade da utilização de métodos de apoio à decisão que permitam simultaneame...
Introduction to nanotechnology in eco-efficient construction
Torgal, Fernando PachecoThis chapter provides a brief overview of some important aspects of nanotechnology starting with its earlier steps and how countries are trying to establish an advantageous position in this field. China deserves a special mention because it is already the second largest producer of nanotechnology papers after the United States. The need for nanotechnology in the construction sector is emphasized. An outline of ...
Introduction to the recycling of construction and demolition waste (CDW)
Torgal, Fernando PachecoThe chapter starts with an overview on the recycling of construction and demolition wastes (CDW), followed by a brief analysis on the EU 70% recycling target for 2020.
Predicting compressive strength of different geopolymers by artificial neural n...
Nazari, A.; Torgal, Fernando PachecoIn the present study,six different models based on artificial neural networks have been developed to predict the compressive strength of different types of geopolymers.The differences between the models were in the number of neurons in hidden layers and in the method of finalizing the models.Seven independent input parameters that cover the curing time,Ca(OH)2 content, the amount of superplasticizer, NaOH conce...
Gás radão : um perigoso contaminante do ar no interior das habitações
Torgal, Fernando PachecoAs preocupações com a qualidade do ar no interior das habitações e de que forma esta pode repercutir-se na saúde das pessoas constitui uma temática que suscita cada vez mais interesse. O caso do gás radão embora conhecido há já algumas décadas continua ainda a ser encarado por muitos como um tema bizarro mas sem implicações graves na qualidade do ar. Aliás os próprios cursos de Arquitectura e Engenharia Civil e...
Biotech cementitious materials : some aspects of an innovative approach for con...
Torgal, Fernando Pacheco; Labrincha, J. A.The deterioration of reinforced concrete structures is a very common problem due to the fact that this material has a high permeability which allows water and other aggressive media to enter, thus leading to corrosion problems. The use of sealers is a common way of contributing to concrete durability. However, the most common ones are based on organic polymers which have some degree of toxicity. The Regulation ...
Embodied energy versus operational energy. Showing the shortcomings of the ener...
Torgal, Fernando Pacheco; Faria, Joana; Jalali, SaidEnergy is a key issue for Portugal, it is responsible for the higher part of its imports and since almost 30% of Portuguese energy is generated in power stations it is also responsible for high CO2 emissions. Between 1995 and 2005 Portuguese GNP rise 28%, however the imported energy in the same period increased 400%, from 1500 million to 5500 million dollars. As to the period between 2005 and 2007 the energy im...
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