View the embedded image gallery online at: https://www.dcwbiskra.dz/images/stories/Documents/statistiques/images/stories/Documents/depliants/images/stories/journees_etudes/journees2014/journee_matiere_construction2014/images/stories/Icones/index.php?id=352&option=com_content&view=article#sigFreeId146cd9edbd