Ana Velosa

Ana Velosa
University of Aveiro | UA · Division of Civil Engineering

PhD

About

127
Publications
48,303
Reads
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1,947
Citations
Citations since 2016
44 Research Items
1494 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Additional affiliations
September 2000 - present
University of Aveiro
Position
  • Professor (Associate)

Publications

Publications (127)
Article
Full-text available
With the availability of commercial Natural cements (NC) for the conservation purposes raises a fundamental question about the compatibility between historic and repair mortars. The properties of Natural cements are dependent on the geological location of the raw material extraction and also on the production parameters, both having an impact on th...
Article
Full-text available
This investigation intends to study and characterize the mortars and bricks from walls and floors used in the funerary nucleus of the archaeological site of Dr. Gonçalo Sampaio Street (Braga, Portugal), associated with the Via XVII necropolis of the Bracara Augusta Roman city. The diversity of the funeral structures and their exceptional state of c...
Article
Full-text available
Salt crystallization is one of the main decay processes in historic masonry mortars, and climate change can worsen the salt weathering effects on those materials as result of, e.g., more often rain falls, more intense solar radiation and sea level rise. In this paper, the effectiveness and durability of a substitution “ventilated render” system (a...
Article
Full-text available
This paper intends to characterize the floor mortar layers (nucleus, rudus and statumen) of the high imperial mosaics of the domus integrated in the Museum of Archeology D. Diogo de Sousa, the oldest roman housing testimonies known in Braga, Portugal. It offers an important archaeological and historical contextualization and first chemical characte...
Article
Tiles are found on numerous Portuguese facades. The exposure to external agents causes degradation and, in some cases, detachment of these tiles. In the coastal area of Aveiro city (Portugal), the building's facades, exposed to adverse atmospheric conditions are in constant contact with aggressive agents, which cause the detachment of a significant...
Article
Full-text available
Metakaolins (MKs) prepared from low-grade kaolins located in the Alvarães (A) and Barqueiros (B) regions of Portugal were used as the aluminosilicate source to compare their effect on the compressive strength and heavy metal adsorption of geopolymers. Natural zeolite, an inexpensive, efficient adsorbent, was used as an additive in formulations to e...
Article
The possibility of using geopolymers to fill gaps/lacunae in glazed ceramic tiles (azulejos) has been studied. Since the 15th century, glazed ceramic tiles are characteristic elements of the Portuguese architectural heritage and their use as external rendering elements has made them prone to degradation. On the other hand, civil construction is a s...
Article
Exterior old glazed tiled facades have been a very important heritage testimony of Portuguese culture and traditions throughout the years. The adhesion of the mortars to the old tiles is a very important factor in the behavior of the tiled facades. This study performs a mechanical and water behavioral characterization of compatible air lime (AL) mo...
Conference Paper
Full-text available
Em Portugal, o uso de cimento natural aparece entre o final do século XIX e o início do século XX, numa época de transição entre a utilização de ligantes à base de cal e a generalização do moderno cimento Portland. O cimento natural resulta da queima de rochas calcário argilosas sem alteração da composição após extração, distinguindo-se da cal hidr...
Chapter
Ceramics sugar jars pieces are, from morphological point of view, conical containers of fired clay with a hole in the vertex, which were used to sugar cane pulp maturation into sugar cake. These ceramic materials were produced in Aveiro given the existence of local raw material. Also, this occurrence of geological deposits exploited for red clays a...
Chapter
Adobe is an extremely simple form of earth construction and with this technique the shrinkage associated with the construction of large structures is avoided. In Portugal, earthen materials have been used in load-bearing walls in the form of adobe or rammed earth for the construction of buildings especially in the southern and central coast. Most c...
Article
Full-text available
Earth construction is the oldest building practice known. The adobe is a simple and sustainable type of earth construction. Many of adobe buildings are in an advanced state of degradation due to the effect of natural agents and to the aging of constituent materials. There is a strong concern with these materials, because in addition to their sustai...
Preprint
Sustainability, particularly in construction materials, has been a subject of growing interest. Civil construction is one of the industries where more materials are consumed, which leads to high energy consumption and CO2 emissions. The production of cement, especially clinker is largely responsible for these problems. As a solution, new materials...
Poster
Full-text available
O património edificado do final do séc. XIX e início do séc. XX caracteriza-se por uma diversidade de estilos arquitetónicos, nomeadamente a Arte Nova, Art Deco e o Modernismo. • Existe uma lacuna de informação acerca das argamassas desta época, havendo a necessidade de identificar os ligantes, agregados e traços utilizados. • Em Portugal, este per...
Conference Paper
Full-text available
The use of natural cement in Portugal can be chronologically traced between the end of the XIX and the beginning of the XX century in a transitional period between the use of lime-based binders and the general use of the modern Portland cement. The use of these materials is frequently overlapped showing the importance of a correct identification of...
Book
Full-text available
International Forum of Architectural Heritage Portugal / Brazil is in the 4th Edition corresponding to the narrowing of international cooperation ties between the two countries, whose first edition took place in October 2014 in Campinas, With the joint organization of the Institute of Architects of Brazil (IAB) - Núcleo de Campinas and the Universi...
Article
The most commonly used materials to fill gaps/lacunae in glazed tiles are lime mortars or organic resins, which have some disadvantages regarding their compatibility and durability, failing to guarantee the desired characteristics. Therefore, there is a need to develop new materials with compatible characteristics, able to withstand exposure to var...
Article
Full-text available
The Earth construction is the oldest building practice on the world. Around 30% of the world population lives in buildings made of earth materials. These materials offer economic and environmental benefits, because of that the interest of these types of construction are being increased. The practice of earth construction is predominant in less deve...
Article
The effect of industrial waste from the cork industry on the strength and adsorption properties of zeolite-metakaolin based geopolymers has been studied. Cork residue 20% by weight was added to geopolymers that contained 0%, 25%, 50%, 75% replacement of metakaolin by zeolite in the structure. The SiO2/Al2O3 and Na2O/Al2O3 molar ratios were kept at...
Poster
Full-text available
É essencial conhecer as características intrínsecas aos materiais originais e aos novos produtos, utilizados na reabilitação e conservação dos revestimentos antigos à base de cal aérea, de forma a contribuir para a preservação da identidade histórica do património edificado. Assim, as ações de intervenção devem reger-se pelo princípio de compatibil...
Poster
Resumo É essencial conhecer as características intrínsecas aos materiais originais e aos novos produtos, utilizados na reabilitação e conservação dos revestimentos antigos à base de cal aérea, de forma a contribuir para a preservação da identidade histórica do património edificado. Assim, as ações de intervenção devem reger-se pelo princípio de com...
Article
Old mortars have specific characteristics that vary with location, type of building, type of use and time of application. When mortars or systems containing mortars lose function, it becomes necessary to develop new compatible compositions. Bond strength tests for rehabilitation or conservation mortars, based mostly on EN 1015-12: 2000 (CEN in EN 1...
Article
The present work studies the bond strength between new mortars and old tiles. The influence in tile/mortar bond strength of moisture content of tiles, mortars aggregates grain size distribution and nature, binder/aggregate ratio, different tile ceramic parts, water absorption and porous characteristics of historic tiles and new mortars were evaluat...
Conference Paper
Full-text available
Resumo Portugal é privilegiado nas suas matérias-primas para a produção de cerâmica, com destaque nas regiões norte e centro [1]. A partir do século XVIII, torna-se pioneiro na produção e exportação [2], iniciando o fabrico pelo grés e faiança comum [3]. Incentivado pelo período pombalino, o artesanato deu lugar a complexos fabris proporcionando-se...
Conference Paper
Full-text available
A salvaguarda do património edificado (edificações de interesse cultural e histórico) de um país e/ou região possibilita a compreensão dos modos de vida de anteriores civilizações, dos materiais e dos processos construtivos utilizados na época de construção bem como a sua evolução ao longo do tempo. A conservação deste património é fundamental e co...
Article
The homogeneous state of the concrete in the fresh state has consequences on their properties in the hardened state. The use of pozzolanic concrete must be carefully evaluated, because the physical and chemical differences of each pozzolan have consequences on concrete hardened state properties. In this work, two physical and chemically different p...
Article
Full-text available
Tendo em conta o facto de que em várias ilhas do arquipélago de Cabo Verde, se procedia, de forma corrente, à produção de cal, serve este estudo como levantamento das técnicas de produção da cal utilizadas em Cabo Verde, nas ilhas da Boavista, Santo Antão e São Vicente. O estudo contempla, de forma mais alargada, a identificação dos locais de produ...
Conference Paper
Full-text available
Os ETICS são sistemas utilizados nas zonas opacas dos edifícios para proteger toda a estrutura e alvenarias, melhorar o desempenho térmico e em alguns casos, o isolamento acústico a sons aé-reos. São constituídos por vários componentes (camada de isolante térmico, argamassas, redes de fibra de vidro, acabamentos), que devem ser compatíveis entre si...
Conference Paper
Como material de valor incalculável no património português, o azulejo é um elemento característico de diferentes fachadas exteriores, sujeito à ação de degradação de diversos agentes, surgindo a necessidade de restauro das fachadas azulejares antigas para sua preservação e, por conseguinte, há a crescente investigação de materiais como soluções de...
Article
This work investigates the effect of clinoptilolite, a natural zeolite, as filler on the mechanical performance and heavy metal's adsorption capacity of the metakaolin-based geopolymers. Clinoptilolite was chosen as an inexpensive additive with high adsorption capacity, replacing metakaolin (0, 25, 50 and 75%) in the synthesis of four different geo...
Conference Paper
Este trabalho apresenta o desenvolvimento de um revestimento de substituição “emboço ventilado” para paredes de edifícios antigos com revestimentos degradados devido à ação severa da água (humidade ascensional através das fundações com elevada concentração de NaCl). Este revestimento foi submetido a ciclos de dissolução e cristalização que permitir...
Article
Earth construction is the oldest building material known, with documented cases of the use of earth bricks since Mesopotamia around 10 000 BC. Earth construction exists throughout most of the world in different cultures, and for some countries it continues to be the main process of construction. Around 30% of the world's population lives in buildin...
Article
The durability of concrete structures is an important issue nowadays. Specifically in the case of reinforced concrete bridges or other infrastructures one of the main form of environmental attack is the penetration of chloride ions, which leads to corrosion of concrete steel reinforcement. This study aims to evaluate the effect of the introduction...
Article
This work investigates the effect of clinoptilolite, a natural zeolite, as filler on the mechanical performance and heavy metal's adsorption capacity of the metakaolin-based geopolymers. Clinoptilolite was chosen as an inexpensive additive with high adsorption capacity, replacing metakaolin (0, 25, 50 and 75%) in the synthesis of four different geo...
Article
The treatment of rising damp in historic building walls is very complex due to the thickness and heterogeneity of the walls. Some techniques, such as watertight barriers and injection of hydrofuge products, that have been used until now to deal with rising damp, are sometimes ineffective, justifying the need for a new approach. When there is the pr...
Article
The homogeneous state of the concrete in the fresh state has consequences on their properties in the hardened state. The use of pozzolanic concrete must be carefully evaluated, because the physical and chemical differences of each pozzolan have consequences on concrete hardened state properties. In this work, two physical and chemically different p...
Article
Full-text available
Este artigo apresenta um revestimento de substituição "emboço ventilado" para edifícios antigos sujeitos à ação severa da água (humidade ascensional através das fundações com elevada concentração de NaCl). Este revestimento, composto por duas camadas de revestimento (emboço e reboco), foi submetido a ciclos de dissolução e cristalização para simula...
Article
Full-text available
This research was focused on the use of the modified Chapelle test as a direct laboratory methodology to access the pozzolanic activity of both experimental and commercial metakaolins. At the same time, this test was used in the evaluation of experimental metakaolins. This chemical test, performed during 16 hours at 90 °C, allows the quantification...
Article
Rheological behavior of concrete is closely related to the rheology of its mortar. This paper aims to study the relation between the rheological parameters of mortars and its corresponding concretes. The correlation between the compressive strength of mortars and the corresponding concretes is also considered. Workability of mortars and concretes,...
Article
Full-text available
Portugal is well known for its facades decorated entirely with ornamented glazed ceramic wall tiles called azulejos. On ageing, the tiles may detach and fall off, or deteriorate to such an extent that it becomes necessary to replicate them. Hence tile replication is a common practice in Portugal for façade restoration, but very often these new tile...
Article
Full-text available
The development of technologies for environmental protection contributes to save and preserve natural resources. Recently, both government and private sectors have accepted the view that rational utilization of non-renewable resources must be achieved. Historically, concrete industry relies heavily on the use of natural aggregates and Portland ceme...
Article
Full-text available
The use of tiles in Portuguese façade coatings began in the nineteenth century with industrialized production of tiles. Nowadays, many nineteenth century façades are degraded and in urgent need of maintenance. New bonding mortars must be developed in order to substitute the existing ones. Compatibility, durability, and reversibility with the old ma...
Article
In this study synthetic fine and coarse zeolite pellets were chosen in the development of air lime–metakaolin mortars for repairing ancient masonry to be used in conservation and restoration of cultural heritage. Synthetic zeolite was used due to their particular water adsorption properties and act as an artificial pozzolan promoting the developmen...
Article
Full-text available
The objective of this study is to evaluate the protective capacity of concretes produced with metakaolin in relation to the transportation and penetration of chlorides. Thus, from a commercial concrete of fck equal to 30 MPa, more two other concretes were produced by replacing 10% of cement by metakaolin, by weight. In one of them, it was kept the...
Article
This paper relates the study of the bond mechanism between lime mortars and glazed tiles. These materials were sampled from facades in Ovar-Portugal, which had been clad in the 19th Century. A thorough characterization of mortars and tiles was performed as well as an analysis of the interface between these materials, based on the quantification of...
Article
Full-text available
One of the most severe pathologies suffered by early industrially produced tiles in Portugal in late nineteenth century is glaze detachment in wall tiles placed in the lower part of the façade. It is known that salts crystallize provoking the glaze detachment, destroying the waterproofing and the beauty of the wall tile and this is one of the cruci...
Article
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 and microstructural behavior of mortars formulated with a recently produced natural hydraulic lime NHL3.5 that conforms to EN 45...
Article
Full-text available
RESUMO Manutenção e reabilitação são importantes medidas de preservação de azulejos históricos de fachada. No contexto de reabilitação dos materiais, é fundamental o conhecimento de suas características originais. Diante disso, esta pesquisa se propôs a caracterizar a interface azulejo/argamassa em amostras provenientes de fachadas de Ovar – Portu...
Article
A study was conducted on the development of lime based grouts for consolidation of renders and plasters detached from the support. The aim is to develop grouts that should be compatible with the preexisting materials and allow the restoring of the adherence of coatings to the background. Special attention was paid to the rheological behaviour of th...
Article
Full-text available
Glazed ceramic tiles have been used as facade claddings prominently since the beginning of the 19th century and they are today considered significant historic heritage. Several deterioration mechanisms threaten this important legacy. Detachment due to aging and to several external actions is one of the most dangerous mechanisms. New mortars compati...
Article
Full-text available
Earth materials have been used in the form of adobe or rammed products for the construction of load-bearing walls in buildings. In Portugal, the adobe has been used predominantly on the central coast, particularly in the Aveiro district. Although many old adobe buildings in Aveiro have been abandoned, some of them can be refurbished with minor main...
Article
One by-product of the brewing process is a waste containing spent grains (barley malt and maize grits). In the brewing process, this cake is composed mainly of organic matter containing high fiber content, provided by the separation of suspended particles through wort filtration. The study presented here was carried out to assess if the spent brewe...