Solidification/stabilization of port sediments contaminated by heavy metals and tbt using slag-based binders

Author(s): Tanya Gutsalenko, Alexandra Bourdot, Peter Seymour, Laurent Frouin, Mohend Chaouche
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 479-484
Total Pages: 6
Language : English

Abstract: Dredge sediments from marine basins represent an environmental issue. Indeed, they are often contaminated with heavy metals and/or organic pollutants. Thus, they are considered as hazardous waste and must undergo treatments to stabilize them and if possible to valorize them. The Dublin Port sediments are contaminated with heavy metals and TBT (Tributyltin) related to port activities (paintings used for boats). In this study, the Solidification/Stabilization method is used because of its technical, environmental and economic benefits. Compression tests were performed on the composites of sediments-OPC- GGBS. The results are correlated with XRD analyses and micro-tomography observations. Regarding the plain OPC based samples, the degradation of the strength can be attributed to the decrease of the amount of some hydration products, may be attributed to internal carbonation resulting from eventual decomposition of organic matter at high pH. This led then porosity increase in comparison to the GGBS-based binder, which microstructure is denser. The stability of contaminant compounds solidified in hydraulic binders was considered through leaching tests. The leachates were analyzed using ICP-MS technique for HM and GC-MS analyses to follow the evolution of TBT and its derivatives throw. The results show a positive effect of GGBS based binder in stabilizing contaminated sediments.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00