Encontrados 12 documentos, a visualizar página 1 de 2
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 ...
An overview on concrete carbonation in the context of eco-efficient
Torgal, Fernando Pacheco; Miraldo, Sérgio; Labrincha, J. A.; Brito, Jorge deCarbonation is a major cause of concrete structures deterioration leading to expensive maintenance and conservation operations. The eco-efficient construction agenda favours the increase of the use of supplementary cementing materials (SCMs) to reduce Portland cement’s consumption and also the use of recycled aggregates concrete (RAC) in order to reduce the consumption of primary aggregates and to avoid landfil...
Are geopolymers more suitable than Portland cement to produce high volume recyc...
Torgal, Fernando Pacheco; Ding, Yining; Miraldo, Sérgio; Abdollahnejad, Zahra; Labrincha, J. A.The 70% minimum construction and demolition wastes-C&DW recycling rate set by the Revised Waste framework Directive No. 2008/98/EC to be enforced beyond 2020, will increase the need of effective recycling methods in a dramatic manner. So far, recycled aggregates (which constitute the majority of C&DW) are reused in low volume percentages for average compressive strength concretes and mostly as road sub-base and...
Fresh state characterization of lime mortars with PCM additions
Lucas, S.; Senff, L.; Ferreira, V. M.; Aguiar, J. L. Barroso de; Labrincha, J. A.The application of sustainability principles in construction encourages the development of new products, with new functionalities and applications, able to improve buildings environmental performance. The use of latent heat storage materials in lime mortars aims to reduce the energy consumption of buildings. This work intends to evaluate the impact of phase change materials (PCM) incorporation in rheological an...
Solvent extraction aplied to the recovery of heavy metals from galvanic sludges
Silva, João Eudes da; Paiva, A. P.; Soares, Delfim; Labrincha, J. A.; Castro, F.In this study, a hydrometallurgical treatment involving the solvent extraction and recovery of some heavy metals from a sulphuric acid leach solution of galvanic sludge, using di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and bis-(2,4,4- trimethylpentyl)-phosphinic acid (Cyanex 272), both diluted in kerosene, has been investigated. The preliminary tests revealed the necessity to remove other metal species than zin...
Physical and chemical characterisation of metal finishing industrial wastes
Magalhães, Jorge M.; Silva, João Eudes da; Castro, F.; Labrincha, J. A.In EU countries approximately 150,000 ons/year of galvanic sludges are generated by 4000 industrial units from the orresponding wastewater treatment plants. These sludges are generally classified as hazardous (European Waste Catalogue as adopted in Council Decision 2000/532/CE and as amended by Decisions 2001/118/EC, 2001/119/EC and 2001/573/CE), basically due to the presence of heavy metals. This work attemp...
Leaching behaviour of a galvanic sludge in sulphuric acid and ammoniacal media
Silva, João Eudes da; Soares, Delfim; Paiva, A. P.; Labrincha, J. A.; Castro, F.Leaching studies of a sludge produced by the physico-chemical treatment of astewaters generated by a Ni/Cr plating plant were carried out in both sulphuric acid and ammoniacal media aiming to decide which of them would be the best treatment for this kind of waste material. The dissolution behaviour of some metals (Cu, Ni, Cr and Zn) was studied in order to assure the best metal recovery conditions in subsequent...
Argamassas de cimento portland com incorporação de <<óxido secundário>> aluminí...
Pereira, D. A.; Aguiar, J. L. Barroso de; Castro, F.; Almeida, M. F.; Labrincha, J. A.O objectivo principal deste trabalho prende-se com o estudo da possibilidade de reutilizar «óxido secundário» resultante do tratamento de reciclagem de escória salina, como matéria-prima a adicionar as argamassas de cimento Portland.. O comportamento da escória à lixiviação aquosa , a análise química da solução, do soluto e das várias fracções resultantes da separação granulométrica dos óxidos lixiviados por es...
Effect of experimental variables on the inertization of galvanic sluges in clay...
Magalhães, Jorge M.; Silva, João Eudes da; Castro, F.; Labrincha, J. A.The incorporation of several industrial wastes in ceramic matrixes had been attempted as an effective low expense technique for the fixation of metallic species in usable products or simply to reduce the residue volume for further disposal. However, the dominant mechanism of the inertization process and the relevant influent parameters are still unknown, mostly due to the complexity of the systems. This work re...
Inertização de resíduos industriais de alumínio em materiais cerâmicos refractá...
Pereira, D. A.; Labrincha, J. A.; Couto, D. M.; Castro, F.; Almeida, M. F.Estudou-se a incorporação de escórias salinas de alumínio e lamas galvânicas de anodização de alumínio, como matéria prima para a fabricação de materiais refractários.
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