Departamento de Materiais: Recent submissions

Now showing items 561-580 of 740

Inhibition of ASR and DEF: evaluation of the microstructure of concrete mixes with pozzolanic additions

Santos Silva, A.; Soares, D.; Matos, L.; Divet, L.; Salta, M. M. (ZAG, Slovenian National Building and Civil Engineering Institute, 2011-06)

The use of pozzolanic mineral additions is a known method to inhibit the expansive chemical reactions in concrete, like the alkali-silica reaction (ASR) or the delayed ettringite formation (DEF). The ASR is a chemical ...
Influence of environmental service conditions in Portugal on structural timber bonded connections

Custódio, J.; Cruz, H.; Palma, P. (2011)

A set of experiments was conducted to investigate how effective the insulating properties of timber were against excessive heating of a bonded connection located inside a structural element. The exterior and interior ...
Enhanced durability of structural bonded timber joints. Effectiveness of adhesion promotion techniques

Custódio, J.; Cruz, H.; Broughton, J. (2011)

Long-term durability of a structural adhesive joint is an important requirement, because it has to be able to support the required design loads, under service conditions, for the planned lifetime of the structure. Epoxy ...
Coatings applied on damp building substrates: performance and influence on moisture transport

Brito, V.; Gonçalves, T. D.; Faria Rodrigues, P. (Springer, 2011)

Dampness is a common condition in old buildings and, accordingly, many paint systems specific for this type of building allow for application on walls with nonnegligible moisture content. In spite of that, performance ...
Drying of red ceramic brick. Effect of five silicone-based water-repellent treatments.

Couto, S.; Gonçalves, T. D.; Grandão Lopes, J. (2011-05-12)

The presence of moisture inside a material whose surface was treated with a water repellent agent may give rise to unwanted side-effects. Indeed, the temporal and spatial significance of moistening events may be intensified ...
Use of a silicone-based hydrophobic treatment in ceramic floor tiles: a case-study in Portugal

Gonçalves, T. D. (Istituto Superiore per la Consevazione ed il Restauro (ISCR), 2011-05-13)

Hydrophobic treatments are often used in porous ceramic floor tiles to prevent the occurrence of stains during the use phase. Premature failure of the ceramic pavement of several apartments and townhouses of a golf resort ...
Argamassas antigas. Produtos resultantes de reações químicas ao longo do tempo.

Magalhães, A.; Santos Silva, A.; Veiga, M. R. (2011-05)

As modificações sofridas pelas argamassas de revestimento ao longo do tempo são acompanhadas de rearranjos químicos e físicos na sua estrutura, bem como de alterações nas suas propriedades químicas e físicas. Várias reações ...
Argamassas resistentes ao tempo: abordagem microestrutural de fortificações portuguesas

Menezes, P.; Borges, C.; Santos Silva, A.; Menezes, A. P.; Veiga, M. R. (2011-05)

O complexo de fortificações de Cascais, litoral centro-sul de Portugal, foi erguido a partir do século XVI com a intenção de reforçar a defesa marítima da Vila e porto de Cascais, ao temer-se que as forças castelhanas ...
Evaluation of pozzolanic reactivity of artificial pozzolans

Pontes, J.; Santos Silva, A.; Faria Rodrigues, P. (Escola de Engenharia da Universidade do Minho, 2011-04)

Pozzolanicity is a very interesting issue regarding building materials, as a way to enhance mortars and concrete durability. This property results from the reaction between calcium hydroxide and silica and alumina based ...
Historical Heritage: A study to conservation

Borges, C.; Santos Silva, A.; Veiga, M. R.; Borsoi, G. (Escola de Engenharia da Universidade do Minho, 2011-04)

Considering ancient monuments and historical buildings, it seems that these mortars have proved to be durable and reliable materials. The restoration and maintenance of old renders is one of the key aspects of correct ...
Behaviour of glass in cement-based materials: Its role on ASR

Serpa, D.; Santos Silva, A.; Soares, D.; Santos, M. B.; Brito, J. (Escola de Engenharia da Universidade do Minho, 2011-04)

One of the most worrying degradation mechanisms in hardened concrete is the occurrence of chemical expansive reactions, namely due to alkali-silica reactions (ASR). This pathology involves the formation of expansive products ...
Alkali-Aggregate Reactions in concrete: Methodologies applied in the evaluation of Alkali Reactivity of Aggregates for concrete

Santos Silva, A.; Soares, D.; Fernandes, I.; Salta, M. M. (Escola de Engenharia da Universidade do Minho, 2011-04)

The alkali-aggregate reaction (AAR) in concrete is a group of chemical reactions that involves the reaction of certain minerals present in the aggregates with alkali and hydroxyl ions in the interstitial solution of cement ...
The influence of slaking time on lime putty

Margalha, G.; Santos Silva, A.; Veiga, M. R.; Brito, J. (Universidade do Porto, 2011-04)

A new interest in the preservation of mortars, plasters and decorative finishings in façades has emerged in certain European countries in the past thirty to forty years, with a view to understanding how they have evolved ...
Phase and microstructural characterization of lime-MK blended mixes

Gameiro, A.; Santos Silva, A.; Veiga, M. R.; Velosa, A. (Escola de Engenharia da Universidade do Minho, 2011-04)
Mitigation of Internal Expansive Reaction: the role of Tungsten Mine Sludge

Sousa, S.; Santos Silva, A.; Velosa, A.; Gameiro, A.; Rocha, F. (Escola de Engenharia da Universidade do Minho, 2011-04)

The concrete degradation caused by internal expansive reaction (IER) is a problem that affects many structures in the world. These reactions, which include the alkali-silica reaction (ASR) and the internal sulphatic reaction ...
Use of tungsten mine sludge waste in the mitigation of internal expansive reaction

Sousa, S.; Santos Silva, A.; Velosa, A.; Rocha, F. (universidade do Porto, 2011-04)

The degradation of concrete structures by the internal expansive reactions (IER), which include the alkali-silica reaction (ASR) and the internal sulphate reaction (ISR) related with delayed ettringite formation (DEF), are ...
Effect of inorganic content on the performance of anticorrosive hybrid sol-gel coated EN AW-6063 alloy

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S. (Materais 2011 - SPM, 2011-04-18)

The organic-inorganic hybrid sol-gel films have been reported as an effective anti-corrosion and environmentally friendly alternative to Cr(VI) pre-treatment for aluminium alloys. These hybrid materials, constituted by ...
Evaluation of Adhesion Promotion Techniques for Structural Bonded Timber Joints

Custódio, J.; Broughton, J.; Cruz, H. (Taylor & Francis Group, LLC, 2011)

Long-term durability of a structural adhesive joint is an important requirement, because it has to be able to support the required design loads, under service conditions, for the planned lifetime of the structure. Epoxy ...
Rehabilitation of timber structures – Preparation and environmental service condition effects on the bulk performance of epoxy adhesives

Custódio, J. (Elsevier, Ltd., 2011)

Epoxy adhesives have been used for many years in the rehabilitation of timber structures and are currently the most appropriate adhesive type for on-site operations. However, because they exhibit excellent initial joint ...
Planeamento da actividade de normalização do ONS/LNEC - Ano de 2011

Costa Ferreira, A. (LNEC, 2011-04)

O presente relatório apresenta o plano de actividade de nonnalização do ONS/LNEC para o ano de 2011, com destaque para a coordenação da actividade das Comissões Técnicas de Nonnalização CT 90, CT 115 e CT 156, para a ...

Now showing items 561-580 of 740

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