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Le Grand-Quevilly, France

Rica H.C.,Ecole Superieure dIngenieurs des Travaux de la Construction de Caen | Saussaye L.,Direction Territoriale Normandie Center | Saussaye L.,University of Caen Lower Normandy | Boutouil M.,Ecole Superieure dIngenieurs des Travaux de la Construction de Caen | And 2 more authors.
Engineering Geology | Year: 2016

Soil stabilizationwith lime and hydraulic binders is a widely used technique to improve the stability and the mechanical properties of soils for use in road construction. However, the presence of substances such as sulphates can induce the swelling, cracking and loss of some mechanical properties defined as disruptive behaviours. This paper analyses the disturbances on the treatment of one silty soil contaminated with sulphates, chlorides, phosphates and nitrates salts, separately then by combinations of two salts. Tests in accelerated curing conditions are used as they are the first realised by the embankments companies, before undertaking further study. The impact of each soluble salt depends on the associated anion and cation. It is not possible to establish a degree of disturbance by cation or anion type. The deleterious effects of sulphates can change if other salts coexist in the soil (i.e., Vs (Volumetric swelling) equal 7% in case of potassiumsulphate contamination,whereas Vs reaches 18 and 23% with a crossed contamination of potassium-sodium sulphates and potassium sulphate-chloride respectively). The influence of complete salts, instead of anions only, should be integrated in technical guides to improve the reliability of the suitability tests they propose. © 2016 Elsevier B.V.

Antoine R.,Direction Territoriale Normandie Center | Antoine R.,University of Rouen | Fauchard C.,Direction Territoriale Normandie Center | Fauchard C.,CNRS Laboratory for the Characterization of Amorphous Polymers | And 2 more authors.
International Journal of Geophysics | Year: 2015

Ground penetrating radar (GPR) is a nondestructive method allowing the improvement of our knowledge of civil engineering structures. In particular, this method may be a nondestructive efficient tool for dike diagnosis and complete classical geotechnical methods. In this paper, we present GPR observations obtained on an earth embankment (crest and sloped paved revetment) in bad condition and located on the lateral canal of the Loire river (Saint Firmin, 80 km South East of Orléans). These measurements are combined with corings, visual inspection, and permeability logging performed with an updated drilling system, the Perméafor. This survey leads (i) to the detection of decompressed zones associated with leakage areas visible at the foot of the downstream slope and (ii) to the location of potentials voids underneath the paved revetment. This multidisciplinary approach complied with the dike inspection methodology proves its efficiency for the assessment of earth embankments. © 2015 Raphaël Antoine et al.

Bordel S.,ERA33 Cerema | Somat A.,University of Rennes 1 | Barbeau H.,Erdyn Atlantique | Anceaux F.,University of Valenciennes and HainautCambresis | And 6 more authors.
Accident Analysis and Prevention | Year: 2014

This article presents the methodology developed within the framework of the research project SARI (Automated Road Surveillance for Driver and Administrator Information). This methodology is based on the logic of action research. The article presents the different stages in the development of technological innovation addressing vehicle control loss when driving on a curve. The results observed in speed reduction illustrate that no matter how optimal an innovation may be technologically speaking, it is only as effective as it is acceptable from a user standpoint. This acceptability can only be obtained if the technology is developed by engineers in liaison with social science specialists. © 2014 Elsevier Ltd.

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