Laboratoire Regional Des Ponts Et Chaussees Of Nancy

Tomblaine, France

Laboratoire Regional Des Ponts Et Chaussees Of Nancy

Tomblaine, France
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Derombise G.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | Vouyovitch Van Schoors L.,IFSTTAR | Klop E.A.,Teijin Aramid BV | Schotman A.H.M.,Teijin Aramid BV | And 2 more authors.
Journal of Materials Science | Year: 2012

Aramid fibres are high-performance materials proposed in geotextiles for alkaline ground reinforcement. To study their durability in such environments, accelerated ageing has been carried out at pH 9 and at pH 11 for up to one and a half years. First, the lateral and longitudinal crystallite sizes have been determined before and after ageing under these conditions by Wide-Angle X-ray diffraction. Next, the tensile fracture surfaces have been observed after different ageing times by scanning electron microscopy. Finally, molecular weight changes have been evaluated by size exclusion chromatography. This study highlights the dependence of structural changes on the ageing conditions. A structural degradation scheme is proposed. © 2011 Springer Science+Business Media, LLC.

Derombise G.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | Van Schoors L.V.,IFSTTAR | Bourmaud A.,South Brittany University | Davies P.,French Research Institute for Exploitation of the Sea
Journal of Applied Polymer Science | Year: 2012

The recent use of aramid fibers in geotextiles for ground reinforcement raises fundamental durability issues, in particular in alkaline soils where they are subjected to hydrolysis. To study the degradation mechanisms in such an environment, accelerated aging at pH 9 and at pH 11 has been carried out for up to one and a half years. This work describes the morphological evolutions that occur and the morphology-properties relationship during aging in moderately alkaline environments. The decreases in apparent density are larger at pH 9 than at pH 11, whereas the bulk chemical degradation is more extensive at pH 11 than at pH 9. Scanning electron microscopy micrographs of chemically etched fibers and the measurements of the local elastic modulus by nanoindentation support these results. Finally, this study has indicated an inverse correlation between the porosity level and the tensile strength. © 2011 Wiley Periodicals, Inc.

Do Couto D.,CNRS Paris Institute of Earth Sciences | Do Couto D.,Total S.A. | Popescu S.-M.,GeoBioStratData.Consulting | Suc J.-P.,CNRS Paris Institute of Earth Sciences | And 7 more authors.
Marine and Petroleum Geology | Year: 2014

This paper provides a new environmental, sedimentological and stratigraphic context of the Lago Mare deposits from the North Alboran region and clarifies their chronologic location with respect to the Messinian Salinity Crisis. We present new micropalaeontological data (dinoflagellate cysts, calcareous nannoplankton, planktonic foraminifers), correlated with field observations and offshore seismic interpretations. We show that the Lago Mare event known in three onshore localities (Río Mendelín near Malaga, Zorreras near Sorbas, Gafares near Níjar) follows the marine reflooding of the Mediterranean Basin which ended the Messinian Salinity Crisis. Chronologically, these Lago Mare deposits last from the latest Messinian to the early Zanclean. In fact, the first influx of Paratethyan organisms is revealed by the dinoflagellate cyst record from near Malaga within a Gilbert-type fan delta overlying the Messinian Erosional Surface. Invading molluscs and/or ostracods may have persisted in lagoonal coastal areas more or less affected by discontinuous marine influxes (Sorbas and Níjar). The Malaga area is convenient for a palaeogeographic and sedimentary reconstruction which shows the prevalent forcing of sea-level changes during the time-interval 5.600-5.332Ma at the difference of the usually solicited prevalent tectonics. The studied Lago Mare event is the third episode resulting in such a palaeobiological assemblage in the Mediterranean region and corresponds to the final two-way water exchange at high sea level between the Mediterranean and the former Paratethys. It documents the onset of the modern marine circulation in the Mediterranean after the reflooding ending the Messinian Salinity Crisis. © 2014 Elsevier Ltd.

Suc J.-P.,CNRS Institute of Earth Sciences | Gillet H.,University of Bordeaux 1 | Cagatay M.N.,Technical University of Istanbul | Popescu S.-M.,GeoBioStratData.Consulting | And 13 more authors.
Marine and Petroleum Geology | Year: 2015

The two sides of the Strandja Sill show a highly discontinuous stratigraphic succession since the Late Oligocene. This area, together with the Sea of Marmara Basin, is usually proposed as the gateway for the Paratethyan freshwaters and organisms that constituted the Lago Mare facies in the Mediterranean Sea during the Messinian Salinity Crisis (MSC). Our investigations involving new field observations and datings, together with previous studies, suggest that the sill has possibly experienced such a connection at around 8. Ma, i.e. significantly before the crisis. The proposal of a sea-level drop of the Black Sea before 7. Ma is not supported by our data on dinoflagellate cysts. Consistency of calcareous nannofossil succession at DSDP Site 380 is reinforced, allowing to reassert that subaerial erosion impacted both the southwestern Black Sea and the central Marmara - Dardanelles area during the peak of the MSC. At that time, this region was crossed by two oppositely directed fluvial networks, further supporting the absence of a marine gateway through the Strandja Sill. It is concluded that none of the Lago Mare events recorded in the Mediterranean during the MSC were the consequence of the passage of Paratethyan waters and organisms through this area. In the Black Sea, the well-dated Messinian fluvial erosion can be followed offshore. The overlying prograding deltaic deposits attest to a fast marine reflooding after the crisis. This constitutes a comprehensive erosion - sedimentation model in an area intensively explored for hydrocarbons. © 2015 Elsevier Ltd.

Do Couto D.,University of Geneva | Popescu S.-M.,GeoBioStratData.Consulting | Suc J.-P.,CNRS Institute of Earth Sciences | Melinte-Dobrinescu M.C.,Romanian National Institute of Marine Geology and Geoecology GeoEcoMar | And 6 more authors.
Marine and Petroleum Geology | Year: 2015

The marine context of the Lago Mare deposit near Malaga has received agreement as well as its ascription to the third Lago Mare event of Clauzon et al. (2005). This deposit is not a "transitional unit towards normal marine conditions" but followed the marine reflooding of the Mediterranean Basin, allowing the connection with the Dacic Basin (Eastern Paratethys). We show that this Lago Mare event did not result from a climatic change leading to a dilution episode but from a high sea-level connection. Different interpretations on the respective effects of tectonics and eustatism on the sedimentary archives linked to the Messinian Salinity Crisis (MSC) are once more debated. They depend on (1) the duration assigned to the MSC and its subdivisions, (2) the amplitude of the successive sea level variations, and at last (3) the dimensional (local or regional) view of the MSC. Such discrepancies concern subsidiary matters which cannot mask first order facts and progresses in their knowledge. © 2014 Elsevier Ltd.

Clauzon G.,Aix - Marseille University | Suc J.-P.,CNRS Institute of Earth Sciences | Couto D.D.,University of Geneva | Jouannic G.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | And 16 more authors.
Marine and Petroleum Geology | Year: 2015

The Sorbas Basin is the land reference of the Messinian Salinity Crisis (MSC) that affected the Mediterranean Sea in the latest Miocene. Its stratigraphy has been re-visited using calcareous nannofossils and planktonic foraminifers, which provide a reliable biostratigraphic frame and lead to particularly specify the relationships between the Sorbas and Zorreras members with Yesares evaporites.The evaporites overlie a shallowing upward sequence ending with the deposition of the Reef Unit and Terminal Carbonate Complex (TCC) on the periphery of the basin. The reefal carbonates of the TCC are overlain by clastic deposits that are foreset beds of post-MSC Gilbert-type fan deltas developed on the northern edge of the basin. These sedimentary structures are separated from reefal carbonates and the Reef Unit by the Messinian Erosional Surface (MES). The various facies of the Sorbas Member have been correlated with the bottomset beds of the Gilbert-type fan deltas despite some differences in palaeobathymetry. In the southeastern periphery of the basin, the MES separates the Sorbas Member from the Yesares gypsums. In the central part of the basin, a hiatus characterizes the contact between these members. The Zorreras Member postdates the MSC and entirely belongs to Zanclean. Its white "Lago Mare" layers are lagoonal deposits, the fauna of which is confirmed to result from Mediterranean-Paratethys high sea-level exchange after the post-MSC marine reflooding of the Mediterranean Basin.This study allows to re-assert the two-step scenario of the MSC (Clauzon etal., 1996) with the following events:. - at 5.971-5.600Ma, minor sea-level fall resulting in the desiccation of this peripheral basin with secondary fluctuations;- at 5.600-5.460Ma, significant subaerial erosion (or lack of sedimentation) caused by the almost complete desiccation of the Mediterranean Sea;- instantaneous marine reflooding, accepted at 5.460Ma, followed by continuing sea-level rise. © 2015 Elsevier Ltd.

Dumoulin J.,Ifsttar Institute Francais Des Science Technologies Des Transports Of Lamenagement Et Des Reseaux | Ibos L.,University Paris Est Creteil | Marchetti M.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | Mazioud A.,University Paris Est Creteil
European Journal of Environmental and Civil Engineering | Year: 2010

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. © 2011 Lavoisier, Paris.

Mauduit C.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | Hammoum F.,British Petroleum | Piau J.-M.,British Petroleum | Mauduit V.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy | And 2 more authors.
Road Materials and Pavement Design | Year: 2010

Contraction/expansion effects induced by freeze-thaw cycles are thought to be at the origin of important and sudden deteriorations of pavement surface course, observed on some road sections in North-East of France. Therefore following these events and observations, it was decided to investigate in laboratory the phenomenon of freeze-thaw on partially water saturated bituminous materials specimen. This article presents some aspects of this beginning research work. We report an experimental investigation on the effect of the freezing-thaw cycles of bituminous materials. Some specimens are subjected to laboratory freeze-thaw cycles under a freezing rate without moisture change with the environment. In addition to basic mechanical properties and pore distribution, the measurement is also performed for freezing expansion of material of the specimen in each cycle. From these results, it is observed that the freezing expansion can be measured for high degree of saturation of the material. The results indicate also that the specimens experiment significant swelling at the beginning of the freezing periods. It is believed that the phenomenon could be detrimental to pavements, especially in the case of differential horizontal strains appearing within the structure layers, due to different swelling conditions depending on the materials and their moisture content. © 2010 Lavoisier, Paris.

Fontana M.D.,CNRS Laboratory of Optical Materials, Photonics, and Systems | Marchetti M.,Laboratoire Regional Des Ponts Et Chaussees Of Nancy
20th IMEKO World Congress 2012 | Year: 2012

The paper is devoted to the abilities of Raman probe to detect simultaneously several salts diluted in water. It has shown that this probe can be used for in situ monitoring of pollutants in waste water.

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