title: Geotechnical and mineralogical characterisations of marine-dredged sediments before and after stabilisation to optimise their use as a road material.
abstract: Dredging activities to extend, deepen and maintain access to harbours generate significant volumes of waste dredged material. Some ways are investigated to add value to these sediments. One solution described here is their use in road construction following treatment with hydraulic binders. This paper presents the characterisation of four sediments, in their raw state and after 90 days of curing following stabilisation treatment with lime and cement, using a combination of novel and established analytical techniques to investigate subsequent changes in mineralogy. These sediments are classified as fine, moderately to highly organic and highly plastic and their behaviour is linked to the presence of smectite clays. The main minerals found in the sediments using X-ray diffraction (XRD) and automated mineralogy are quartz, calcite, feldspars, aluminium silicates, pyrite and halite. Stabilisation was found to improve the mechanical performances of all the sediments. The formation of cementitious hydrates was not specifically detected using automated mineralogy or XRD. However, a decrease in the percentage volume of aluminium silicates and aluminium-iron silicates and an increase of the percentage volume of feldspars and carbonates was observed.
authors.affiliation: a Ecole Supérieure d'Ingénierie et des Travaux de la Construction de Caen (ESITC Caen) Epron , France.
authors.forename: L
authors.initials: L
authors.lastname: Saussaye
authors.affiliation: b Camborne School of Mines (CSM), College of Engineering, Mathematics and Physical Sciences (CEMPS), Tremough Campus, University of Exeter , Penryn , UK.
authors.forename: E
authors.identifier: http://orcid.org/0000-0002-5432-3521
authors.initials: E
authors.lastname: van Veen
authors.affiliation: b Camborne School of Mines (CSM), College of Engineering, Mathematics and Physical Sciences (CEMPS), Tremough Campus, University of Exeter , Penryn , UK.
authors.forename: G
authors.identifier: http://orcid.org/0000-0002-0655-6304
authors.initials: G
authors.lastname: Rollinson
authors.affiliation: a Ecole Supérieure d'Ingénierie et des Travaux de la Construction de Caen (ESITC Caen) Epron , France.
authors.forename: M
authors.identifier: http://orcid.org/0000-0002-2752-8265
authors.initials: M
authors.lastname: Boutouil
authors.affiliation: b Camborne School of Mines (CSM), College of Engineering, Mathematics and Physical Sciences (CEMPS), Tremough Campus, University of Exeter , Penryn , UK.
authors.forename: J
authors.identifier: http://orcid.org/0000-0002-9939-8682
authors.initials: J
authors.lastname: Andersen
authors.affiliation: b Camborne School of Mines (CSM), College of Engineering, Mathematics and Physical Sciences (CEMPS), Tremough Campus, University of Exeter , Penryn , UK.
authors.forename: J
authors.identifier: http://orcid.org/0000-0001-7234-3588
authors.initials: J
authors.lastname: Coggan
mesh_terms: D003252:Construction Materials / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D008903:Minerals / Q000032:analysis*; D009792:Oceans and Seas; D014186:Transportation; D014961:X-Ray Diffraction
chemical_list: D008903:Minerals
keywords: Marine sediment; hydraulic binders; mineral composition; physical properties; stabilisation