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Materiais e técnicas antigas para melhorar a durabilidade dos edifícios em terra
Eires, R.; Camões, Aires; Jalali, SaidUma grande parte do património mundial construído tem sido realizada com recurso à construção em terra. A durabilidade deste património existente e principalmente dos novos edifícios construídos em terra é particularmente condicionada pela erosão causada pela ação da água, especialmente em países com uma elevada taxa de pluviosidade. Com esta pesquisa pretende-se contribuir para o aumento do conhecimento relati...
Efeitos da incorporação da ecosílica no desempenho de argamassas produzidas por...
Pappalardo Jr., Alfonso; Jalali, Said; Camões, AiresVol.1 ; Este trabalho aborda os efeitos da incorporação de resíduos de pó de vidro contendo sílica amorfa para a produção de argamassas obtidas por ativação alcalina de metacaulinos. São utilizadas na preparação das soluções activadoras à base de silicato de sódio – ou de potássio – duas fontes de sílica que serão objeto de comparação: uma proveniente do processo de reciclagem do vidro originário do lixo munic...
Comparison of costs of brick construction and concrete structure based on funct...
Sazedj, Soheyl; Morais, António; Jalali, SaidIn the context of economic sustainability of building construction, it is an issue to decide which constructive solution is more reasonable without loosing quality. This study is about the comparison of the costs of construction of structural walls; conventional reticulated reinforced concrete structure filled with ceramic blocks versus unreinforced masonry with ceramic blocks. Functional units are defined as i...
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...
Placing and curing self-compacting concrete in hot climates
Calado, Carlos; Camões, Aires; Jalali, SaidSelf-compacting concrete (SCC) should present compatible quality and cost with conventional concrete (CC). Although SCC is advantageous its processability in hot climate regions is not well understood and is the main topic of this investigation. We used similar compositions of SCC and CC to study the fresh cement workability: Marsh Cone and Vicat test for different temperatures, and a Scanning Electronic Micros...
Earth architecture : ancient and new methods for durability improvement
Eires, R.; Camões, Aires; Jalali, SaidQuite a big part of the country and world’s heritage was made using unfired earth constructions. The new earth buildings, as well as the conservation of the existent heritage, need scientific knowledge to allow higher durability. This durability is particularly conditioned by erosion caused by water action, especially in countries with high rainfall index. Analyzing the old building techniques, that allow prote...
Comparação ambiental de alvenaria estrutural e construção convencional: Aplicaç...
Sazedj, Soheyl; Morais, António; Jalali, SaidVerificar as emissões de CO2 e a energia incorporada na construção em alvenaria estrutural.
Earth construction : lessons from the past for future eco-efficient construction
Torgal, Fernando Pacheco; Jalali, SaidEarth construction has received in the last decade an increased attention by the scientific community illustrated by a tenfold increase of the published research articles when compared to the previous decade. Earth construction has a major expression in less developed countries, however, the mimetic temptations towards more polluting construction techniques based on reinforced concrete and fired bricks are like...
Some considerations about the use of lime-cement mortars for building conservat...
Torgal, Fernando Pacheco; Faria, Joana; Jalali, SaidSome investigations about conservation actions in historical buildings points out that lime–cement mortars should be avoided and lime–pozzolan mortars should be use instead. Nevertheless this type of mortar is still under investigation and the absolute rejection of the use of Portland cement even with just a minimum amount appears to be a dogmatic position that is not fully grounded in scientific terms. Besides...
Properties and durability of concrete containing polymeric wastes (tyre rubber ...
Torgal, Fernando Pacheco; Ding, Yining; Jalali, SaidThe volume of polymeric wastes like tyre rubber and polyethylene terephthalate bottles (PET) is increasing at a fast rate. An estimated 1000 million tyres reach the end of their useful lives every year and 5000 millions more are expected to be discarded in a regular basis by the year 2030. Up to now a small part is recycled and millions of tyres are just stockpiled, landfilled or buried. As for PET bottles annu...
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