Dépouillements

Progress in ultrasonic tendon duct imaging / Martin Krause in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 461-485 Titre : Progress in ultrasonic tendon duct imaging Type de document : texte imprimé Auteurs : Martin Krause, Auteur ; Klaus Mayer, Auteur ; Martin Friese, Auteur Année de publication : 2011 Article en page(s) : pp. 461-485 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Ultrasonic  imaging  Prestressed  concrete  structures  Reconstruction  calculation  SAFT  EFIT  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Ultrasonic imaging of tendon ducts enables the precise localisation of grouting faults in many cases. Additionally to well known criteria for detecting grouting faults in tendon ducts recently new possibilities were developed. Two main effects influence the complex behaviour of wave propagation and reflection: a) different arrangement and number of strands or internal rebars; b) superposition of reflecting signals and different wave modes propagating into the interface region around the tendon duct. In order to understand the experimental results, EFIT modelling is performed (EFIT: Elastodynamic Finite Integration Technique). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16039 [article] Progress in ultrasonic tendon duct imaging [texte imprimé] / Martin Krause, Auteur ; Klaus Mayer, Auteur ; Martin Friese, Auteur . - 2011 . - pp. 461-485. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 461-485 Mots-clés : Ultrasonic  imaging  Prestressed  concrete  structures  Reconstruction  calculation  SAFT  EFIT  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Ultrasonic imaging of tendon ducts enables the precise localisation of grouting faults in many cases. Additionally to well known criteria for detecting grouting faults in tendon ducts recently new possibilities were developed. Two main effects influence the complex behaviour of wave propagation and reflection: a) different arrangement and number of strands or internal rebars; b) superposition of reflecting signals and different wave modes propagating into the interface region around the tendon duct. In order to understand the experimental results, EFIT modelling is performed (EFIT: Elastodynamic Finite Integration Technique). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16039

Non destructive evaluation of seven-wire strands using ultrasonic guided waves / Laurent Laguerre in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 487-500 Titre : Non destructive evaluation of seven-wire strands using ultrasonic guided waves Type de document : texte imprimé Auteurs : Laurent Laguerre, Auteur ; Fabien Treyssede, Auteur Année de publication : 2011 Article en page(s) : pp. 487-500 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Elastic  guided  wave  Dispersion  Cement  grouted  steel  Seven-wire  strand  Modelling  Experiment  Magnetostrictive  Wave  defect  interaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Seven-wire strands are widely used in civil engineering structures for cable-stayed bridges, prestressed concrete bridges or retaining walls applications. Corrosion and fatigue induced damages are of major concern for these metallic strands. The aim of this paper is to give an overview of the theoretical and experimental works on the non destructive evaluation (NDE) of steel members using ultrasonic guided waves generated and detected with piezoelectric or magnetostrictive transducers. Results obtained for different frequency ranges on various configurations will be shown and discussed in order to quantify the performances and limits of guided ultrasonic wave inspection methodologies. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16040 [article] Non destructive evaluation of seven-wire strands using ultrasonic guided waves [texte imprimé] / Laurent Laguerre, Auteur ; Fabien Treyssede, Auteur . - 2011 . - pp. 487-500. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 487-500 Mots-clés : Elastic  guided  wave  Dispersion  Cement  grouted  steel  Seven-wire  strand  Modelling  Experiment  Magnetostrictive  Wave  defect  interaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Seven-wire strands are widely used in civil engineering structures for cable-stayed bridges, prestressed concrete bridges or retaining walls applications. Corrosion and fatigue induced damages are of major concern for these metallic strands. The aim of this paper is to give an overview of the theoretical and experimental works on the non destructive evaluation (NDE) of steel members using ultrasonic guided waves generated and detected with piezoelectric or magnetostrictive transducers. Results obtained for different frequency ranges on various configurations will be shown and discussed in order to quantify the performances and limits of guided ultrasonic wave inspection methodologies. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16040

Influence of aggregates and air voids on the ultrasonic velocity and attenuation in cementitious materials / Miguel Molero in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 501-517 Titre : Influence of aggregates and air voids on the ultrasonic velocity and attenuation in cementitious materials Type de document : texte imprimé Auteurs : Miguel Molero, Auteur ; Ignacio Segura, Auteur ; Sofia Aparicio, Auteur Année de publication : 2011 Article en page(s) : pp. 501-517 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Multiple  scattering  model  Multiphase  material  Velocity  Attenuation  Mortar Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper examines the influence of the size and volume fraction of both aggregates and air voids on the ultrasonic phase velocity and attenuation coefficient measured in cementitious specimens. A multiphase approach of the Waterman-Truell (WT) model was used to study theoretically how the size and volume fraction of the constituents in cementitious materials affect velocity and attenuation profiles. To verify the theoretical results obtained by the model, ultrasonic measurements were performed in several cementitious specimens with different granulometries of elastic aggregates (glass microspheres). Both theoretical and experimental results showed that velocity information can largely identify changes in the volume fraction of aggregates, whereas attenuation information is more sensible to variations in the aggregate size. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16041 [article] Influence of aggregates and air voids on the ultrasonic velocity and attenuation in cementitious materials [texte imprimé] / Miguel Molero, Auteur ; Ignacio Segura, Auteur ; Sofia Aparicio, Auteur . - 2011 . - pp. 501-517. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 501-517 Mots-clés : Multiple  scattering  model  Multiphase  material  Velocity  Attenuation  Mortar Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper examines the influence of the size and volume fraction of both aggregates and air voids on the ultrasonic phase velocity and attenuation coefficient measured in cementitious specimens. A multiphase approach of the Waterman-Truell (WT) model was used to study theoretically how the size and volume fraction of the constituents in cementitious materials affect velocity and attenuation profiles. To verify the theoretical results obtained by the model, ultrasonic measurements were performed in several cementitious specimens with different granulometries of elastic aggregates (glass microspheres). Both theoretical and experimental results showed that velocity information can largely identify changes in the volume fraction of aggregates, whereas attenuation information is more sensible to variations in the aggregate size. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16041

Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis / Cédric Payan in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 519-531 Titre : Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis Type de document : texte imprimé Auteurs : Cédric Payan, Auteur ; Vincent Garnier, Auteur ; Joseph Moysan, Auteur Année de publication : 2011 Article en page(s) : pp. 519-531 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Stress  monitoring  Nonlinear  parameter  Coda  waves  Multiple  scattering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : For non destructive stress evaluation in prestressed concrete, we describe in this paper a promising ultrasonic method. In “ordinary” isotropic homogeneous materials such as steel, ultrasonic determination of third order elastic constants provides means for stress evaluation since half a century. In case of concrete, example of a class of materials that exhibit strong multiple scattering as well as significant elastic nonlinear response, accurate velocity monitoring is challenging. In this paper, we purpose a novel method originally from geophysics. So called “coda wave interferometry” (CWI), this technique is transposed to concrete. We show that intense scattering can be applied to robustly determine velocity changes and so, nonlinear elastic constants. In addition, we show how this method could be transposed in case of in situ measurements in concrete structures and outline future possible applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16042 [article] Determination of nonlinear elastic constants and stress monitoring in concrete by coda waves analysis [texte imprimé] / Cédric Payan, Auteur ; Vincent Garnier, Auteur ; Joseph Moysan, Auteur . - 2011 . - pp. 519-531. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 519-531 Mots-clés : Stress  monitoring  Nonlinear  parameter  Coda  waves  Multiple  scattering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : For non destructive stress evaluation in prestressed concrete, we describe in this paper a promising ultrasonic method. In “ordinary” isotropic homogeneous materials such as steel, ultrasonic determination of third order elastic constants provides means for stress evaluation since half a century. In case of concrete, example of a class of materials that exhibit strong multiple scattering as well as significant elastic nonlinear response, accurate velocity monitoring is challenging. In this paper, we purpose a novel method originally from geophysics. So called “coda wave interferometry” (CWI), this technique is transposed to concrete. We show that intense scattering can be applied to robustly determine velocity changes and so, nonlinear elastic constants. In addition, we show how this method could be transposed in case of in situ measurements in concrete structures and outline future possible applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16042

Study of fibre distribution and orientations in UHPFRC by electrical resistivity and mechanical tests / Jean-François Lataste in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 533-544 Titre : Study of fibre distribution and orientations in UHPFRC by electrical resistivity and mechanical tests Type de document : texte imprimé Auteurs : Jean-François Lataste, Auteur ; Stephanie J. Barnett, Auteur ; Tony Parry, Auteur Année de publication : 2011 Article en page(s) : pp. 533-544 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Fibre  Reinforced  Concrete  (FRC)  Electrical  resistivity  Flexural  test  X-Ray  imaging  Fibre  orientation  Fibre  distribution Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as non-destructive technique (electrical resistivity) and non destructive technique on cores (X-ray). Electrical resistivity measurements are done as a blind test, to characterise the electrical anisotropy and deduce the distribution and the orientation of fibres. These results are compared to X-ray imaging to check the quality of the non destructive evaluation. Then, flexural and compressive strength are measured on specimens to assess the influence of fibre distribution on the concrete properties. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16043 [article] Study of fibre distribution and orientations in UHPFRC by electrical resistivity and mechanical tests [texte imprimé] / Jean-François Lataste, Auteur ; Stephanie J. Barnett, Auteur ; Tony Parry, Auteur . - 2011 . - pp. 533-544. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 533-544 Mots-clés : Fibre  Reinforced  Concrete  (FRC)  Electrical  resistivity  Flexural  test  X-Ray  imaging  Fibre  orientation  Fibre  distribution Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents experimental tests carried out on steel fibre reinforced concrete samples, including mechanical tests as well as non-destructive technique (electrical resistivity) and non destructive technique on cores (X-ray). Electrical resistivity measurements are done as a blind test, to characterise the electrical anisotropy and deduce the distribution and the orientation of fibres. These results are compared to X-ray imaging to check the quality of the non destructive evaluation. Then, flexural and compressive strength are measured on specimens to assess the influence of fibre distribution on the concrete properties. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16043

Shearography applied to the non destructive evaluation of bonded interfaces between concrete and CFRP overlays / Frédéric Taillade in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 545-556 Titre : Shearography applied to the non destructive evaluation of bonded interfaces between concrete and CFRP overlays : From the laboratory to the field Type de document : texte imprimé Auteurs : Frédéric Taillade, Auteur ; Marc Quiertant, Auteur ; Karim Benzarti, Auteur Année de publication : 2011 Article en page(s) : pp. 545-556 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Non  destructive  testing  Shearography  Disbonds  Concrete  Carbon  epoxy  FRP Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A shearographic method is proposed that allows (i) to detect bonding defects (delamination or adhesive disbonds) between concrete structures and externally bonded FRP reinforcements, (ii) to assess the width of these defects, and (iii) to evaluate the quality of the adhesive bond in the case of partial delamination, damage or poor properties of the polymer adhesive. The performance of the method is first demonstrated on laboratory specimens containing calibrated defects, i.e., non adherent polytetrafluoroethylene discs placed at the concrete-to-FRP interface. Then, an example of on-site application illustrates the potential of such method for routine inspections of FRP strengthened structures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16044 [article] Shearography applied to the non destructive evaluation of bonded interfaces between concrete and CFRP overlays : From the laboratory to the field [texte imprimé] / Frédéric Taillade, Auteur ; Marc Quiertant, Auteur ; Karim Benzarti, Auteur . - 2011 . - pp. 545-556. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 545-556 Mots-clés : Non  destructive  testing  Shearography  Disbonds  Concrete  Carbon  epoxy  FRP Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A shearographic method is proposed that allows (i) to detect bonding defects (delamination or adhesive disbonds) between concrete structures and externally bonded FRP reinforcements, (ii) to assess the width of these defects, and (iii) to evaluate the quality of the adhesive bond in the case of partial delamination, damage or poor properties of the polymer adhesive. The performance of the method is first demonstrated on laboratory specimens containing calibrated defects, i.e., non adherent polytetrafluoroethylene discs placed at the concrete-to-FRP interface. Then, an example of on-site application illustrates the potential of such method for routine inspections of FRP strengthened structures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16044

Detection of non emergent defects in asphalt pavement samples by long pulse and pulse phase infrared thermography / Jean Dumoulin in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 557-574 Titre : Detection of non emergent defects in asphalt pavement samples by long pulse and pulse phase infrared thermography Type de document : texte imprimé Auteurs : Jean Dumoulin, Auteur ; Laurent Ibos, Auteur ; Mario Marchetti, Auteur Année de publication : 2011 Article en page(s) : pp. 557-574 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Active  infrared  thermography  Heat  transfer  Numerical  simulations  Pavement  materials Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In this paper, Pulse Thermography analysis was applied to detect non emergent defects in asphalt concrete used for road pavements. Experimental and numerical experimentations were run on this specific heterogeneous material. Only experimental data acquired with an un-cooled microbolometer camera (less sensitive than a cooled one) were used. Data were processed using a semi-infinite heat transfer model in order to determine the depth of the defects. At last, a discussion on the influence of performances of the IR camera employed versus potential detection of subsurface defects is given in correlation with the investigated domain of pavement materials. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16045 [article] Detection of non emergent defects in asphalt pavement samples by long pulse and pulse phase infrared thermography [texte imprimé] / Jean Dumoulin, Auteur ; Laurent Ibos, Auteur ; Mario Marchetti, Auteur . - 2011 . - pp. 557-574. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 557-574 Mots-clés : Active  infrared  thermography  Heat  transfer  Numerical  simulations  Pavement  materials Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In this paper, Pulse Thermography analysis was applied to detect non emergent defects in asphalt concrete used for road pavements. Experimental and numerical experimentations were run on this specific heterogeneous material. Only experimental data acquired with an un-cooled microbolometer camera (less sensitive than a cooled one) were used. Data were processed using a semi-infinite heat transfer model in order to determine the depth of the defects. At last, a discussion on the influence of performances of the IR camera employed versus potential detection of subsurface defects is given in correlation with the investigated domain of pavement materials. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16045

Blind deconvolution via sparsity maximization applied to GPR data / Khaled Chahine in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 575-586 Titre : Blind deconvolution via sparsity maximization applied to GPR data Type de document : texte imprimé Auteurs : Khaled Chahine, Auteur ; Vincent Baltazart, Auteur ; Yide Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 575-586 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Non  destructive  testing  Reflectivity  series  Sparsity  Time  delay  estimation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In measuring thin layer thickness of asphalt pavements using GPR, the sparse reflectivity series representing the layered structure of the pavement is convolved with the radar wavelet. This convolution results in masking closely spaced reflections. An ideal deconvolution retrieves the reflectivity series, and thus improves the time resolution and facilitates quantitative data interpretation. In this paper, we cast the convolutional model as a multidimensional data model which renders blind deconvolution via independent component analysis possible. We use a nonlinearity related to the double exponential density whose heavy-tailed nature provides further insight into the sparse nature of the reflectivity series. The method is tested on synthetic and real GPR data from a thin PVC slab. The results show the accuracy of the time delay estimates and verify the high resolution capability of the proposed approach. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16046 [article] Blind deconvolution via sparsity maximization applied to GPR data [texte imprimé] / Khaled Chahine, Auteur ; Vincent Baltazart, Auteur ; Yide Wang, Auteur . - 2011 . - pp. 575-586. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 575-586 Mots-clés : Non  destructive  testing  Reflectivity  series  Sparsity  Time  delay  estimation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In measuring thin layer thickness of asphalt pavements using GPR, the sparse reflectivity series representing the layered structure of the pavement is convolved with the radar wavelet. This convolution results in masking closely spaced reflections. An ideal deconvolution retrieves the reflectivity series, and thus improves the time resolution and facilitates quantitative data interpretation. In this paper, we cast the convolutional model as a multidimensional data model which renders blind deconvolution via independent component analysis possible. We use a nonlinearity related to the double exponential density whose heavy-tailed nature provides further insight into the sparse nature of the reflectivity series. The method is tested on synthetic and real GPR data from a thin PVC slab. The results show the accuracy of the time delay estimates and verify the high resolution capability of the proposed approach. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16046

Resonant frequency testing of cylindrical asphalt samples / Nils Ryden in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 587-600 Titre : Resonant frequency testing of cylindrical asphalt samples Type de document : texte imprimé Auteurs : Nils Ryden, Auteur Année de publication : 2011 Article en page(s) : pp. 587-600 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Resonance  Dynamic  modulus  Asphalt Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : There is a need to develop simple and quick non-destructive tests to measure the complex dynamic modulus of asphalt over a wide frequency and temperature range, i.e. mastercurve. In this study results from free-free resonant frequency measurements on cylindrical disk shaped asphalt samples are presented. The resulting mastercurve, obtained by resonant frequency testing at different temperatures, compares well with reference values within the high modulus range. The proposed method is simple and repeatable. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16047 [article] Resonant frequency testing of cylindrical asphalt samples [texte imprimé] / Nils Ryden, Auteur . - 2011 . - pp. 587-600. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 587-600 Mots-clés : Resonance  Dynamic  modulus  Asphalt Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : There is a need to develop simple and quick non-destructive tests to measure the complex dynamic modulus of asphalt over a wide frequency and temperature range, i.e. mastercurve. In this study results from free-free resonant frequency measurements on cylindrical disk shaped asphalt samples are presented. The resulting mastercurve, obtained by resonant frequency testing at different temperatures, compares well with reference values within the high modulus range. The proposed method is simple and repeatable. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16047

Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo / Géraldine Villain in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 601-617 Titre : Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo Type de document : texte imprimé Auteurs : Géraldine Villain, Auteur ; Loïc Le Marrec, Auteur ; Lalaonirina Rakotomanana, Auteur Année de publication : 2011 Article en page(s) : pp. 601-617 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Impact  echo  Porosity  Degree  of  saturation  Carbonation  Concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The presented study aims at evaluating the bulk elastic Young’s modulus of six different concrete mixes as a function of porosity and water content. The impact echo method consists of a frequency analysis of ultrasonic waves generated by the impact of a steel ball. It is commonly used to measure the thickness of large concrete slabs, to detect voids in concrete structural elements considered as infinite. This method was employed on reduced size slabs (0.5 x 0.25 x 0.12 m3). As a consequence, it was necessary to identify the frequencies corresponding to resonance modes or pseudo-stationary modes. This modal analysis was performed with simplified models (for beam in particular) and used to extract the dynamic Young’s modulus Edyn and the Poisson’s ratio. The results are then analysed. The Edyn-modulus, inverted for all concrete mixes, is compared to static Young’s modulus Estat measured by destructive testing, to the porosity and to the water content of the specimens. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16048 [article] Determination of the bulk elastic moduli of various concretes by resonance frequency analysis of slabs submitted to impact echo [texte imprimé] / Géraldine Villain, Auteur ; Loïc Le Marrec, Auteur ; Lalaonirina Rakotomanana, Auteur . - 2011 . - pp. 601-617. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 601-617 Mots-clés : Impact  echo  Porosity  Degree  of  saturation  Carbonation  Concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The presented study aims at evaluating the bulk elastic Young’s modulus of six different concrete mixes as a function of porosity and water content. The impact echo method consists of a frequency analysis of ultrasonic waves generated by the impact of a steel ball. It is commonly used to measure the thickness of large concrete slabs, to detect voids in concrete structural elements considered as infinite. This method was employed on reduced size slabs (0.5 x 0.25 x 0.12 m3). As a consequence, it was necessary to identify the frequencies corresponding to resonance modes or pseudo-stationary modes. This modal analysis was performed with simplified models (for beam in particular) and used to extract the dynamic Young’s modulus Edyn and the Poisson’s ratio. The results are then analysed. The Edyn-modulus, inverted for all concrete mixes, is compared to static Young’s modulus Estat measured by destructive testing, to the porosity and to the water content of the specimens. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16048

Quality of NDT measurements and accuracy of concrete physical properties quantitative assessment / Denys Breysse in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 619-632 Titre : Quality of NDT measurements and accuracy of concrete physical properties quantitative assessment Type de document : texte imprimé Auteurs : Denys Breysse, Auteur ; Mathilde Larget, Auteur ; Zoubir Mehdi Sbartai, Auteur Année de publication : 2011 Article en page(s) : pp. 619-632 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete  Condition  assessment  Diagnostics  Inverse  problem  Material  variability  Non  destructive  evaluation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Assessing concrete condition is of major interest either for looking at weak or more damaged areas, or for reliability computations. NDT measurements provide a valuable way of offering a quick overview on the material condition. One of their main weaknesses is that their results cannot be directly linked with material properties. This paper presents how a collaborative research programme has been developed such as: (a) to select the best appropriate measurement techniques, (b) identify calibration laws enabling the quantitative material condition assessment, (c) identify possible valuable combinations of techniques. This strategy is applied to laboratory specimen data as well as to on site data. A focus is also placed on the reliability of the material condition assessment. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16049 [article] Quality of NDT measurements and accuracy of concrete physical properties quantitative assessment [texte imprimé] / Denys Breysse, Auteur ; Mathilde Larget, Auteur ; Zoubir Mehdi Sbartai, Auteur . - 2011 . - pp. 619-632. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 619-632 Mots-clés : Concrete  Condition  assessment  Diagnostics  Inverse  problem  Material  variability  Non  destructive  evaluation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Assessing concrete condition is of major interest either for looking at weak or more damaged areas, or for reliability computations. NDT measurements provide a valuable way of offering a quick overview on the material condition. One of their main weaknesses is that their results cannot be directly linked with material properties. This paper presents how a collaborative research programme has been developed such as: (a) to select the best appropriate measurement techniques, (b) identify calibration laws enabling the quantitative material condition assessment, (c) identify possible valuable combinations of techniques. This strategy is applied to laboratory specimen data as well as to on site data. A focus is also placed on the reliability of the material condition assessment. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16049

Corrosion monitoring of metals / Gonzalo E. Gallo in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 633-647 Titre : Corrosion monitoring of metals Type de document : texte imprimé Auteurs : Gonzalo E. Gallo, Auteur ; John S. Popovics, Auteur ; Chapman, Patrick L., Auteur Année de publication : 2011 Article en page(s) : pp. 633-647 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Corrosion in civil infrastructure causes structural failures and financial losses. Prompt and effective monitoring of corrosion can lead to failure prevention and cost savings. This paper describes the basis of a practical magnetic sensing scheme to detect corrosion in metals. The magnetic field measurements are carried out with economical and practical GMR sensors. Active and passive magnetic field sensing configurations are presented, and the ability to detect corrosion processes in steel and aluminium samples in aqueous environments is demonstrated. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16050 [article] Corrosion monitoring of metals [texte imprimé] / Gonzalo E. Gallo, Auteur ; John S. Popovics, Auteur ; Chapman, Patrick L., Auteur . - 2011 . - pp. 633-647. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 633-647 Mots-clés : Corrosion Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Corrosion in civil infrastructure causes structural failures and financial losses. Prompt and effective monitoring of corrosion can lead to failure prevention and cost savings. This paper describes the basis of a practical magnetic sensing scheme to detect corrosion in metals. The magnetic field measurements are carried out with economical and practical GMR sensors. Active and passive magnetic field sensing configurations are presented, and the ability to detect corrosion processes in steel and aluminium samples in aqueous environments is demonstrated. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16050

Capacitive ultrasonic micro-transducer made of carbon nanotubes / Bérengère Lebental in European journal of environmental and civil engineering, Vol. 15 N° 4 (Avril 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 649-662 Titre : Capacitive ultrasonic micro-transducer made of carbon nanotubes : Prospects for the in-situ embedded non-destructive testing of durability in cementitious materials Type de document : texte imprimé Auteurs : Bérengère Lebental, Auteur ; Anne Ghis, Auteur ; Elisabeth Delevoye, Auteur Année de publication : 2011 Article en page(s) : pp. 649-662 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Non-destructive  testing  Cementitious  materials  Durability  Micro-porosity  Carbon  nanotubes  Ultrasonic  transducers  Microfluidics  Elasto-acoustics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We put forward an innovative method for the non-destructive testing of durability in cementitious material. It is based on microporosity probing by high-frequency ultrasonic micro-transducers. We present elements of the realisation and the characterization of such challenging devices. Their design relies on the exceptional mechanical performances of carbon nanotubes. Modelling of the devices in a fluid environment provides a preliminary validation of their suitability for durability monitoring. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16051 [article] Capacitive ultrasonic micro-transducer made of carbon nanotubes : Prospects for the in-situ embedded non-destructive testing of durability in cementitious materials [texte imprimé] / Bérengère Lebental, Auteur ; Anne Ghis, Auteur ; Elisabeth Delevoye, Auteur . - 2011 . - pp. 649-662. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 4 (Avril 2011) . - pp. 649-662 Mots-clés : Non-destructive  testing  Cementitious  materials  Durability  Micro-porosity  Carbon  nanotubes  Ultrasonic  transducers  Microfluidics  Elasto-acoustics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We put forward an innovative method for the non-destructive testing of durability in cementitious material. It is based on microporosity probing by high-frequency ultrasonic micro-transducers. We present elements of the realisation and the characterization of such challenging devices. Their design relies on the exceptional mechanical performances of carbon nanotubes. Modelling of the devices in a fluid environment provides a preliminary validation of their suitability for durability monitoring. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16051

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse