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DM/NMM - Comunicações a congressos e artigos de revista: Recent submissions

Now showing items 101-120 of 235

A multidisciplinary approach to the study of archaeological mortars from the town of Ammaia in the roman province of Lusitania (Portugal)*

Cardoso, I.; Macedo, A. L.; Vermeulen, F.; Corsi, C.; Santos Silva, A.; Rosado, L.; Candeias, A.; Mirão, J. (Wiley, 2014-02)

The Roman town of Ammaia (in Marvão Region) is considered one of the most important recent findings of the Roman presence in Portuguese territory. It was settled in Republican times and abandoned in the seventh century. ...
Identification of alkali-reactive aggregates: some examples

Fernandes, I.; Ramos, V.; Noronha, F.; Santos Silva, A.; Nunes, J. C.; Medeiros, S. (Institution of Civil Engineers, 2014-03)

Alkali–aggregate reactions have been known for decades although the acceptance of their occurrence has been delayed in some countries until the 1990s. Potential reactivity has been identified in most of the rock types used ...
Alcohol-Aminosilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Mortar

Figueira, R. B.; Silva, C. J. R.; Pereira, E. V.; Salta, M. M. (Journal of The Electrochemical Society, 2014-05-13)

Organic-inorganic hybrid (OIH) matrices were synthesized by sol-gel method and deposited on hot-dip galvanized steel (HDGS) using a dip-coating process. These OIHs, generally called amino-alcohol-silicates, were synthesized ...
Electrochemical evaluation of hot-dip galvanized steel (HDGS) coated with organic-inorganic hybrid materials in simulated concrete pore solutions

Figueira, R. B.; Silva, C. J. R.; Pereira, E. V.; Salta, M. M. (SPE, 2014-06-30)

Organic-inorganic hybrid (OIH) sol-gel coatings based on ureasilicate gels present promising characteristics to be used as eco-friendly coatings for hot dip galvanized steel (HDGS), in contact with cementitious media, ...
Study of zirconia and silica-zirconia-epoxy sol-gel coatings for corrosion protection of EN AW 6063 aluminium alloy

Fontinha, I. R.; Salta, M. M.; Ferreira, M. G. S. (DEMAC-U. Aveiro, 2014-06-30)

Coating an aluminium alloy in building and automotive industries requires its surface pre-treatment to promote adherence of the organic coating. Chromate based chemical conversion layers (CCC) have been extensively used ...
Test of OIH gel composites with embedded corrosion inhibitors as corrosion protection coatings of hot-dip galvanized steel (HDGS)

Figueira, R. B.; Silva, C. J. R.; Pereira, E. V. (SPE, 2014-06-30)

Although the use of HDGS (hot-dip galvanized steel) in reinforced concrete structures shows improved corrosion resistance due to the presence of the zinc layer, when in contact with fresh concrete is strongly affected by ...
Influence of the pH on the corrosion crotection of epoxy-silica-zirconia sol-sel soatings spplied on EN AW-6063 aluminium alloy

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S.; Figueira, R. B.; Pereira, E. V.; Silva, C. J. R. (ECS -The Electrochemical Society, 2014-05-05)

Aluminium alloys of 6000 series can suffer severe corrosion in polluted (acidic) and/or marine environments and in contact with alkaline media like fresh cementitious materials. Therefore, architectural aluminium components ...
Physical and chemical assessment of lime–metakaolin mortars: Influence of binder:aggregate ratio

Gameiro, A.; Santos Silva, A.; Faria Rodrigues, P.; Grilo, J.; Branco, T.; Veiga, M. R.; Velosa, A. (Elsevier, 2014-01)

This work evaluates the influence of binder:aggregate ratio on the mineralogical and mechanical properties of air lime–metakaolin mortars. Mineralogical analysis showed that binder:aggregate ratio affects the extent of ...
New natural hydraulic lime mortars – Physical and microstructural properties in different curing conditions

Grilo, J.; Faria Rodrigues, P.; Veiga, M. R.; Santos Silva, A.; Silva, V.; Velosa, A. (Elsevier, 2014-03)

The new version of EN 459-1 standard for building limes redefined the classes of hydraulic limes and made the producers reformulate or reclassify their natural hydraulic limes. This work evaluates the mechanical, physical ...
Mechanical and mineralogical properties of natural hydraulic lime-metakaolin mortars in different curing conditions

Grilo, J.; Santos Silva, A.; Faria Rodrigues, P.; Gameiro, A.; Veiga, M. R.; Velosa, A. (Elsevier, 2014-01)

This paper investigates the mechanical and mineralogical characteristics of natural hydraulic lime NHL3.5 (NHL) mortars with different% of lime replacement by metakaolin (MK) under different laboratory and natural marine ...
Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition

Santos Silva, A.; Gameiro, A.; Grilo, J.; Veiga, M. R.; Velosa, A. (Elsevier, 2014-02)

This paper presents the reaction behavior of lime and metakaolin (MK) pastes submitted to long term aging at ambient temperature and relative humidity of 95 ± 5%. The results presented are the basis for an extensive research ...
EIS study of amine cured epoxy-silica-zirconia sol-gel coatings for corrosion protection of the aluminium alloy EN AW 6063

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S. (Sociedade Portuguesa de Electroquímica, 2013)

The organic-inorganic hybrid sol-gel films which structure comprises interconnected inorganic and organic networks have been reported as an environmentally friendly anti-corrosion pre-treatment for several metals, including ...
Corrosion Protection of Hot Dip Galvanized Steel in Mortar

Figueira, R. B.; Pereira, E. V.; Silva, C. J. R.; Salta, M. M. (Sociedade Portuguesa de Electroquimica, 2014-01)

Corrosion of steel in concrete is one of the major causes of structure degradation, requiring expensive maintenance. The using of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the ...
Petrographic characterization in the assessment of alkali aggregate reaction in portuguese volcanic aggregates

Ramos, V.; Noronha, F.; Katayama, T.; Fernandes, I.; Santos Silva, A. (Danish Technological Institute, 2013-06-10)

In Portugal, volcanic rocks are commonly used as aggregates for concrete in Madeira and Azores islands and in a lower extent in the mainland. Nonetheless, the information about the potential alkali-silica reactivity of ...
Influence of the pH on the corrosion protection of epoxy-silica-zirconia sol-gel coatings applied on EN AW-6063 aluminium alloy

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S.; Figueira, R. B.; Pereira, E. V.; Silva, C. J. R. (ECS, Digital Library, 2013-10-27)

Aluminium alloys of 6000 series are particularly suited for the building industry due to their good corrosion resistance. However, they can suffer severe corrosion in acidic (polluted) and/or marine environments [1] and ...
ASR of mortars containing glass

Serpa, D.; Santos Silva, A.; Brito, J.; Pontes, J.; Soares, D. (Elsevier, 2013-10)

Glass is a material that raises environmental issues in terms of both recycling and dumping. Some studies have shown the potential of glass as pozzolan when used as fine powder. Its use as aggregate in cementitious materials ...
Characterization of Deleterious Expansive Reactions in Fagilde Dam

Fernandes, I.; Santos Silva, A.; Piteira Gomes, J.; Tavares de Castro, A.; Noronha, F.; Ribeiro, M. (Springer, 2013-10-03)

A monitoring system has been detecting progressive displacements in Fagilde dam, completed in 1984. Site inspection revealed the existence of random cracking, surface discoloration, and superficial dissolution of cement in ...
Organic-Inorganic Hybrid Sol-gel Coatings to Prevent Corrosion of Galvanized Reinforcing Steel

Figueira, R. B.; Pereira, E. V.; Silva, C. J. R.; Salta, M. M. (E-INOV- “Eletroquímica e Inovação”, 2013-09)

The use of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the service life of reinforced concrete structures exposed to carbonation or to chlorides ions. Immediately after concreting, ...
EIS study of amine cured epoxy-silica-zirconia sol-gel coatings for corrosion protection of the aluminium alloy EN AW 6063

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S. (Sociedadde Portuguesa de Eletroquímica, 2013-04)

The organic-inorganic hybrid sol-gel films have been reported as an environmentally friendly anti-corrosion pre-treatment for several metals. These types of coatings present combined mechanical and chemical properties ...
Effect of the metallic surface pre-treatment on the corrosion behaviour of sol-gel hybrid coated EN AW-6063 alloy

Fontinha, I. R.; Salta, M. M.; Zheludkevich, M.; Ferreira, M. G. S.; Figueira, R. B.; Pereira, E. V. (Sociedade Portuguesa de Materiais, 2013-09-03)

In this work, the effect of alloy surface pre-treatments on the corrosion behaviour of sol–gel hybrid coated EN AW 6063 alloy was studied. Four pre-treatments were used: solvent degreasing; alkaline degreasing followed by ...

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