Neoformations on stony materials of modern building works

Fundação para a Ciência e a Tecnologia (FCT

Geologia na cidade

Ver versão em https://www.ecum.uminho.pt/pt/Media/Documents/Correio%20do%20Minho/2015/23-01-2015.pdfCorreio do Minhoinfo:eu-repo/semantics/publishedVersio

Sobre as possíveis fontes das pedras do Mosteiro de Salzedas (Tarouca - Portugal)

O Mosteiro e Igreja de Salzedas situam-se sobre o Granito de Penodono-Salzedas-Alvite, que neste local se apresenta muito meteorizado e fracturado. A utilização de elementos petrográficos permitiu discriminar diferentes tipos de granitos nestes monumentos e, com informações topográficas e históricas, propor possíveis relações com pedreiras próximas.Fundação para a Ciência e a Tecnologia (FCT

Microscopy studies in support of dating of mortars of historical buildings

Fundação das Universidades PortuguesasMinisterio de Ciencia e InnovaciónFundação para a Ciência e a Tecnologia (FCT

Algumas considerações sobre o estudo estatístico de medições de dose em grãos de argamassas por luminescência estimulada opticamente

Fundação das Universidades PortuguesasMinisterio de Ciencia e Innovación (Espanha)Fundação para a Ciência e a Tecnologia (FCT)Ação Integrada E-141”(Fundação das Universidades Portuguesas)/“Acción Integrada PT2009-0077” (Ministerio de Ciencia e Innovación)/PEst-OE/CTE/UI0697/201

Prediction of the mechanical properties of granites by ultrasonic pulse velocity and Schmidt hammer hardness

The present work deals with the use of simple and economical non destructive techniques, ultrasonic pulse velocity and Schmidt hammer to predict the strength and elastic properties of granitic stones that are characteristic in ancient masonry constructions. Good correlations between NDTs and strength and modulus of elasticity were found, which indicate them as appropriate techniques for estimating the mechanical properties

Experimental properties of granites

In the present work, a study of the tensile mechanical behavior of a set of twelve selected granite lithotypes is carried out. Some petrographic aspects such as grain size and presence of planar anisotropy explain the variation on the parameters that characterize the tensile behavior, like the strength and fracture energy. Other factors that influence the tensile mechanical behavior, such as weathering degree and physical properties like porosity and density, are also analyzed. Statistical correlations between the ultrasonic pulse velocity and the mechanical and physical properties are proposed

Salt weathering of limestones: susceptibility of petrographical features (SEM study)

Fundação para a Ciência e a Tecnologia (FCT) - Verbas nacionais e FEDE

Analysis of weathering and internal texture on the engineering properties of granites

The research significance of the present paper concerns the need of knowing the mechanical properties of stone existing in the ancient constructions, when a suitable methodology for their rehabilitation or strengthening is followed. The rehabilitation of ancient constructions, mainly the ones pertaining to the architectural heritage is a demand of modern societies. The deep knowledge of mechanical and fracture properties of the stone is also an important advantage, when structural analysis is needed for the evaluation of the safety conditions of ancient constructions. Thus, this paper aims at providing large information about the influence of factors such as weathering state and planar anisotropy on the engineering properties of Portuguese granites. It was found that both weathering and internal structure play a major role on the mechanical tensile and compressive behavior of granites. Besides, the non-destructive evaluation reveal as possible technique to predict the weathering and anisotropy of granites

Performance of stones under different conditions : a study of metro stations

The study of stone alterations in the Lisbon Metro stations allowed the discussion of the influence in the development of these alterations of stones characteristics and the actual conditions to which the stones are subjected. Alterations occur under what can be considered the usual conditions of use but also under abnormal situations that must be taken into account given its frequency. The diverse situations identified are considered in the discussion of possible recommendations bearing in mind the actual situations found at the stations.Financiado pela Fundação para a Ciência e a Tecnologia com fundos nacionais (programa plurianual de financiamento de unidades de investigação)