Simona Fontul

Simona Fontul
National Laboratory for Civil Engineering | LNEC · Department of Transportation

Ph.D

About

76
Publications
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397
Citations

Publications

Publications (76)
Chapter
Testing and monitoring of transport infrastructures are challenging tasks due to the increase in traffic intensity and load. Non-destructive tests are used for pavement diagnosis, most of them at traffic speed, in order to avoid interaction with users. With the development of new technologies and enhanced quality of data collected, a combination of...
Article
Suitable road pavements assessment becomes essential to provide safe traffic movements of people and goods. Moreover, a reliable transportation network is a crucial aspect of economic growth. Road pavements are subjected to various factors that influence overall performance (e.g., traffic load, temperature, moisture, delami-nation of the pavement l...
Book
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Print Version of the Special Issue "Trends in GPR and Other NDTs for Transport Infrastructure Assessment"
Article
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The non-destructive testing and diagnosis of transport infrastructures is essential because of the need to protect these facilities for mobility, and for economic and social development. The effective and timely assessment of structural health conditions becomes crucial in order to assure the safety of the transportation system and time saver proto...
Chapter
Transport infrastructures such as roads, railways and runways are under increased traffic loading and their rehabilitation has to be performed in an efficient way, structurally and financially. In this process, monitoring of structural and functional capacity of transport infrastructures using non-destructive tests is performed in a systematic way....
Conference Paper
Full-text available
Resumo Palavras-chave: poluentes rodoviários; escorrências de estradas; alterações climáticas; novas abordagens Os poluentes rodoviários acumulam-se à superfície do pavimento da estrada onde podem sofrer vários processos antes de serem lavados pela precipitação. A previsível alteração dos padrões de quantidade e qualidade das escorrências rodoviári...
Article
As geomembranas de policloreto de vinilo (PVC) são as mais utilizadas em sistemas de impermeabilização de barragens. O sucesso destes sistemas depende da qualidade com que as soldaduras das geomembranas são executadas, as quais devem ser avaliadas no que se refere à estanqueidade e à resistência mecânica, a última geralmente através de ensaios de a...
Conference Paper
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The communication strategy of researchers normally includes presentation of activities and results in scientific conferences and on peer-reviewed scientific journals. Nowadays there is a huge amount of research going on, on really important topics, that actually never really gets to policymakers, professional groups or commercialization; at the sam...
Article
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Our participation in the COST (European Cooperation in Science and Technology) programme gave us significant insights into the importance of explaining scientific findings to non-scientific audiences. In the framework of COST Action TU1208 “Civil engineering applications of Ground Penetrating Radar” we organised a series of dissemination activities...
Conference Paper
[PT] Neste estudo são apresentados e analisados comparativamente os resultados obtidos em ensaios realizados sobre provetes compactados por três metodologias de compactação em laboratório, o ensaio de compac-tação Proctor, enquanto ensaio de referência, e outras duas metodologias, compactação com o Martelo Vibro Compactador e com o compactador Gira...
Article
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This paper describes a study conducted by the National Laboratory for Civil Engineering of Portugal (LNEC), in cooperation with the Defense University Center at the Spanish Naval Academy and “La Sapienza,” University of Rome, to assess the health and safety conditions of the Noble Hall floor in the São Carlos National Theater (Lisbon, Portugal). In...
Conference Paper
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This article presents a case study where FWD and GPR, two NDT methods, were combined to assess the bearing capacity of a flexible pavement. The thickness of the bituminous layer was estimated using a coreless GPR approach: the Common Mid-Point method with Air-Coupled antennas, by combining multiple GPR offset configurations.
Article
Full-text available
The railway infrastructure has very specific constraints that lead to the need of maximizing of the availability of infrastructure, with high levels of safety and quality, associated with an optimized cost. Having said this, it is essential to understand the methods behind the inspection and monitoring of existing railway infrastructures, the way o...
Chapter
This chapter offers an overview on the use of ground-penetrating radar (GPR) for the nondestructive testing (NDT) of transport infrastructures. After a general introduction to the topic of the chapter (Section 1), particular attention is devoted to the use of GPR for the inspection of roads, highways, and airport runways (Section 2); railways (Sect...
Article
Full-text available
The paper describes the uncertainty evaluation related to the dynamic measurement of deflections using a falling-weight-type impulse load device. This equipment is used in road and airfield pavements in-situ testing, contributing for the assessment of their performance analysis and characterization. This study aims at the determination of the defle...
Article
Ground Penetrating Radar (GPR) is commonly used in pavement assessment, manly for measuring pavement layer thickness. Asphalt layer thickness is the most relevant input for flexible pavements assessment. The present study evaluates the feasibility of the Common Mid-Point (CMP) method, for a coreless GPR approach, using air-coupled antennas. Three t...
Article
Full-text available
Ground Penetrating Radar (GPR) systems shall be periodically calibrated and their performance verified, in accordance with the recommendations and specifications of the manufacturer. Nevertheless, most GPR owners in Europe employ their instrumentation for years without ever having it checked by the manufacturer, unless major flaws or problems becom...
Article
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O BIM é uma metodologia que serve para toda a indústria AECO (Arquitetura, Engenharia, Construção e Operação) e, como tal, permite a representação das características estruturais e funcionais de uma construção, incluindo atividades, entre outras informações. A característica principal do BIM é o sistema de modelação tridimensional que inclui a gest...
Article
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The railway track system is a crucial infrastructure for the transportation of people and goods in modern societies. With the increase in railway traffic, the availability of the track for monitoring and maintenance purposes is becoming significantly reduced. Therefore, continuous non-destructive monitoring tools for track diagnoses take on even gr...
Article
Full-text available
In the transport infrastructures context, the support layers have a fundamental role in the degradation of the track condition, both in structural aspects and in terms of fouling of the materials that comprise them. Particularly in the field of railway research, ballast is the key element, and its fouling leads to track deterioration. Thus, the mai...
Article
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Rail transport is the most efficient way of transport from an energetic and environmental point of view. The integration of geosynthetics in the rehabilitation solutions has grown substantially in the last decade, such as the application of different geogrids for reinforcement and/or stabilization of ballast layer. It appears to be consensual that...
Article
Full-text available
In this work, influence of geogrids on overall stabilization of railway tracks is studied numerically. It is expected that by geogrids implementation significant reduction in the downward propagation of stresses will be obtained, which consequently should assure more resilient long-term performance. In this first approach, however, only added value...
Research
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Outcome of COST Action TU1208: A glossary of Ground Penetrating Radar terms in 15 languages spoken in COST Countries
Article
This paper presents the results of the application of two non-destructive tests (NDT): Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR) to assess the bearing capacity of a flexible pavement. The main motivation of this research was the evaluation of the use of this two methodologies, over time-consuming, unsafe and costly tradi...
Presentation
Full-text available
European Geosciences Union General Assembly 2017 (EGU2017); Geophysical Research Abstracts, Vol. 19, EGU2007-3007; Austria Center Vienna (ACV), Vienna, Austria; 23-28 Apr. 2017
Article
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The subgrade provides support to the pavement system and assures an effective distribution of traffic loads in depth. Therefore, a failure in the subgrade will have consequences on the entire pavement behaviour. This work presents an integrated approach for the analysis of the road subgrade condition by combining different Non-Destructive Testing (...
Conference Paper
This work aims at presenting the main results achieved by Working Group (WG) 2 “GPR surveying of pavements, bridges, tunnels and buildings; underground utility and void sensing” of the COST (European COoperation in Science and Technology) Action TU1208 “Civil Engineering Applications of Ground Penetrating Radar” (www.GPRadar.eu, www.cost.eu). The p...
Conference Paper
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Em Portugal, existem diversas ferramentas de levantamento de anomalias e para avaliação do estado de conservação dos edifícios, designadamente o «Método de Avaliação do Estado de Conservação de Imóveis»; contudo, algumas situações que podem causar riscos e deficiências na utilização corrente dos edifícios, caso não derivem de anomalias físicas cons...
Conference Paper
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Este trabalho apresenta um conjunto de ensaios não destrutivos realizados sobre as diferentes camadas de um pavimento rodoviário com o Radar de Prospeção (GPR), o Defletómetro de Impacto Ligeiro (LFWD) e Pesado (FWD), para avaliar as suas propriedades. Os ensaios foram realizados sobre as camadas constituintes das soluções implementadas numa pista...
Conference Paper
Full-text available
A proper quality control of the railway track condition and its monitoring since the construction phase are key factors for a long life cycle and for an efficient maintenance policy. For this purpose, suitable techniques, such as non-destructive tests, represent an efficient monitoring solution as they allow evaluating infrastructure characteristic...
Conference Paper
A rede de transportes, nomeadamente a rodoviária, tem um papel fundamental na sociedade, apresentando uma influência direta no seu desenvolvimento socioeconómico. O efeito produzido pelas cargas dos veículos é uma das principais causas de deterioração da estrutura do pavimento ao longo do tempo, referindo-se ainda a ação das condições climatéricas...
Chapter
Railway infrastructures, mainly the ballasted tracks, require systematic maintenance andaproperplanningfortrackinterventions. Ontheonehand, therailwaylineshave moretrafficandloadscirculatingonthemand, ontheotherhand, theincreasedtraffic speeds on railways require restrictive safety measures during inspection and maintenance. An important part of th...
Chapter
This chapter is a review of some of the usual geophysical survey techniques applied in the assessment of civil engineering structures and infrastructures. The different techniques are based on the measurement of determined parameters and allow delineating the distribution of particular characteristics of the subsurface media. In this way, resistivi...
Conference Paper
Full-text available
No âmbito deste estudo foram avaliadas, monitorizadas e controladas as características de um modelo físico à escala real de quatro estruturas diferentes de uma Estrada de Baixo Volume de Tráfego (EBVT) construído no âmbito das atividades desenvolvidas pelo projeto TROPICAL-PAV. Apresenta-se o controlo de qualidade das várias etapas da construção do...
Conference Paper
This paper presents the results of the application of GPR to detect the constitution of a concrete pre-stressed runway pavement and the location of the rebars, with the aim of evaluation the bearing capacity of the runway.
Conference Paper
Road pollutants accumulate at the road pavement surface and are washed out by precipitation. Site specific variables, including climate, were shown to control the quantity and quality of road runoff. Climatic changes are scenarios with higher temperatures and extreme rainfall (droughts and floods), that will change the behavior of road pavement mat...
Conference Paper
Full-text available
O estado de conservação do imóvel é um dos parâmetros que é avaliado para determina-ção do valor de um imóvel em qualquer dos métodos utilizados. Por vezes, o estado de conservação aparece associado à idade do imóvel e não ao real estado de conservação. Contudo, a realização de trabalhos de manutenção e de obras de reparação e de reabilita-ção cond...
Conference Paper
Full-text available
Engineering or technical degrees are difficult to teach and, consequently, have always been characterized by a large number of academic failures. Therefore, continuous assessment has been applied to classes of similar content, related to Port and Coastal Engineering during these last years in three different Universities worldwide: University of La...
Article
Full-text available
In railways Ground Penetrating Radar (GPR) studies, the evaluation of materials dielectric properties is critical as they are sensitive to water content, to petrographic type of aggregates and to fouling condition of the ballast. Under the load traffic, maintenance actions and climatic effects, ballast condition change due to aggregate breakdown an...
Conference Paper
In order to evaluate the level of ballast fouling for Portugal aggregates and the influence of antenna frequency on its measurement several laboratory tests were performed on different materials. Initially the clean granitic ballast was tested in different water content conditions, from dry to soak in order to see the influence of water on the diel...
Conference Paper
Full-text available
Resumo As condições climáticas, nomeadamente o regime de precipitação e as temperaturas médias do ar, condicionam a quantidade e a qualidade das águas de escorrência de estradas. Em Portugal constatam-se tendências distintas em diferentes regiões de precipitação: para um mesmo tipo de pavimento, autoestradas localizadas em regiões mais áridas, serã...
Conference Paper
Full-text available
In Portugal, the use of GPR exhibited a rather low application rate. • This is due in part to the fact that GPR services are still more expensive than the traditional way, which generally does not have the same degree of precision or implies the destruction of a part of the inspected area, and also because of the nature of Portuguese professionals....
Article
A few years after railway transportation suffered a sharp decline, the rehabilitation of old railway lines have been implemented lately in many countries. Several of these cases regard lines that are expected to be used for freight transport. Whenever possible, during rehabilitation of railway tracks there are technical, economic and environmental...
Conference Paper
In many countries, old railways have to be renewed in order to fulfil modern quality requirements, either related to higher travel speeds, to greater axle loads or to increased capacity. Preferably, such renewal works should be carried out in an economical and environmental sustainable process, taking into account the existing materials and the in...
Conference Paper
Maintenance actions are significant for transport infrastructures but, today, costs have to be necessary limited. A proper quality control since the construction phase is a key factor for a long life cycle and for a good economy policy. For this reason, suitable techniques have to be chosen and non-destructive tests represent an efficient solution,...
Conference Paper
Full-text available
Nowadays, there is an increased interest in developing performance based specifications for quality control during the construction, that can provide more realistic information about the life cycle behaviour of the track. In this research, Falling Weight Deflectometer (FWD) tests were undertaken during the construction of a 29 km new railway line,...
Conference Paper
The evaluation of the railway track condition represents one of the most significant parts of maintenance planning. Generally, only the track geometry is measured and then, during the maintenance process, the parameters of the track layout are restored, through tamping and levelling processes. Nevertheless, one of the main causes of track geometry...
Conference Paper
An important part for a proper railway maintenance policy is the evaluation of the condition of an existing railway substructure, in order to detect the deterioration causes. Recently, the use of non destructive techniques for substructure evaluation has increased due to advantages that these monitoring methods present. Several non destructive test...