Evaluation by means of non destructive techniques to deterioration of mortars due to cycles freeze-thawing

En el presente trabajo se evalúan diferentes morteros, con distinto grado de daño por la acción de ciclos de hielo-deshielo, analizando su estado mediante diferentes métodos de evaluación habituales. Los resultados obtenidos por estos métodos se comparan con un análisis mediante la técnica de espectroscopía de impedancia, analizándose la capacidad de esta técnica para evaluar el estado de los morteros y el grado de daño interno producido.Peer reviewe

Automatic mapping algorithm of nitrogen dioxide levels from monitoring air pollution data using classical geostistical approach : application to the French Lille city

International audienceThis work aims to test a new method of automatic mapping of gaseous nitrogen dioxide in an urban area. These maps have to be realised based on the data provided by automatic on-site monitoring stations, taking into account their scarcity that could hamper a correct spatial interpolation of the pollution levels. In the first part of this study, we propose a new methodology to generate additional data, based on several previous field campaigns performed by passive sampling. Among these passive sampling sites some of them (henceforth called "virtual stations") are time-correlated to a given fixed station (called "reference station"). In the second part of this study, we have tested the suitability of our method for the automated generation of variograms on a case study as well as the quality of the estimations calculated based on these data. For mapping, geostatistical methods were applied, particularly the cokriging one. This multivariable method exploits the additional information given by auxiliary variables; in the case of nitrogen dioxide, variables depicting the area, such as the population density or the emissions inventory, may therefore be used. In order to take into account the uncertainty of the data generated in the virtual stations, we included in the variance-covariance kriging matrix an additional component called the variance of measurement error (VME); a methodology to calculate this component is described. Finally, the resulting maps are well detailed and do show the main features of the pollution due to nitrogen dioxide on the considered domai

Analysis of deterioration of the concrete of a sewer for industrial waste water with sulphates

Trabajo presentado en la International RILEM TC-211-PAE Final Conference, celebrada en Tulouse (Francia), del 3 al 5 de junio de 200

Chloride Diffusion Study Made from the Pre-Testing of Oresund Bridge Mix Proportions

Trabajo presentado en el XXI Nordic Concrete Research Symposium, celebrado en Hämeenlinna (Finlandia), del 30 de mayo al 1 de junio de 201

Use decomposition of portlandite in concrete fire as indicator of temperature progression into the material. Application to fire affected builds

Resumen del trabajo presentado en el 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry, celebrado en Craiova (Rumanía), del 7 al 10 de septiembre de 201

Chloride diffusion study made from the pre-testing of Oresund bridge mix proportions

Trabajo presentado en el XXI Nordic Concrete Research Symposium, celebrado en Hämeenlinna (Finlandia), del 30 de mayo al 1 de junio de 201

Spéciation des métaux Pb, Zn, Cd dans les poussières en suspension dans l'air ambiant par extractions chimiques et pae ESEM-EDS automatisé

To evaluate the toxicity, the biodisponibility and the environmental behaviour of metals like Pb, Zn , Cd in ambient air dust, it is necessary to determine the speciation of these elements, i.e their main physico-chemical species. A chemical extraction procedure has been defined and optimized for pure species of Pb, Zn and Cd (sulfate, sulphur, carbonate and oxide).Pour évaluer la toxicité, la biodisponibilité et le comportement dans l'environnement des métaux Pb, Zn et Cd, il est nécessaire de connaître leur spéciation, c'est à dire de déterminer leurs principales espèces physico-chimiques. Dans ce but, un protocole d'extractions chimiques a été défini et optimisé pour des espèces pures (sulfates, sulfures, carbonates et oxydes)

Use of the portlandite decomposition as indicator of temperature progression into cement based materials exposed to fire

Trabajo presentado en el XIX International Materials Research Congress, celebrado en Cancún (México), del 15 al 19 de agosto de 201

Evolution of hydration of cements with coal botto and fly ash by non-destructive techniques and porosimetry

Resumen del trabajo presentado en el XIII International Conference on Durability of Building Materials and Components, celebrado en São Paulo (Brasil), del 2 al 5 de septiembre de 201

Aplicación de métodos no destructivos a la evaluación del daño interno por hielo-deshielo en materiales cementicios con distintos tipos de cenizas volantes

Trabajo presentado en la XLVIII Congreso Anual de la Sociedad Española de Cerámica y Vidrio, celebrada en Oviedo (España), del 29 al 31 de octubre de 200