About a possible valorisation in cementitious materials of polluted sediments after treatment

Agostini, Franck; Skoczylas, Frédéric; Lafhaj, Zoubeir

doi:10.1016/j.cemconcomp.2006.11.012

Cited by 96 publications

(44 citation statements)

References 16 publications

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“…Researches show the feasibility of treated sediments as aggregates substitution in construction materials such as clay bricks (4), roads (5) and mortars (3,6), Agostini et al (3) found that the substitution of sand by sediments in the treated mortar increases immensely the porosity with the sediment content, while the bulk density decreases linearly with increasing porosity. Replacing up to 33% of the sand by treated sediments improves the Young's modulus, the compressive strengths and the apparent gas permeability compared to normal mortars (6).…”

Section: Introductionmentioning

confidence: 99%

“…Among these wastes, there are the dredged marine sediments that are available in large quantities. Their chemical compositions allows the use in this area, but their contamination requires pretreatment to remove organic pollutants (PAHs: polycyclic aromatic hydrocarbons, PCBs: polychlorinated biphenyls, TBT: tributyltin and dioxins) and stabilize inorganic pollutants (heavy metals like Pb, Cr, Hg, Zn and Cu) (1)(2)(3).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Composite cement mortars based on marine sediments and oyster shell powder

Ez-zaki¹,

Diouri²,

Kamali-Bernard³

et al. 2016

Mater. construcc.

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Additions of dredged marine sediments and oyster shell powder (OS) as cement substitute materials in mortars are examined by several techniques. The sediments have high water and chloride contents and calcite, quartz, illite and kaolinite as principal minerals. The OS powders are entirely composed of calcium carbonate and traces of other impurities. Four mixtures of treated sediments and OS powders at 650 °C and 850 °C are added to Portland cement at 8%, 16% and 33% by weight. The hydration of composite pastes is followed by calorimetric tests, the porosity accessible to water, the bulk density, the permeability to gas, the compressive strength and the accelerated carbonation resistance are measured. In general, the increase of addition amounts reduced the performance of mortars. However, a reduction of gas permeability was observed when the addition was up to 33%. Around 16% of addition, the compressive strength and carbonation resistance were improved. RESUMEN: Morteros de cemento basado en sedimentos marinos y polvo de concha de ostra.En este trabajo se ha valorado la sustitución de cemento en morteros por sedimentos marinos dragados y polvo de concha de ostra (OS). Los sedimentos tienen altos contenidos de agua, cloruros, calcita, cuarzo, illita y caolinita como minerales principales. Los polvos OS están compuestos de carbonato cálcico y trazas de otras impurezas. Se añadieron a un cemento Portland, cuatro mezclas de los sedimentos y polvos de OS tratados a 650 °C y 850 °C en proporciones del 8%, 16% y 33% en peso. La hidratación de pastas se estudió a través de calorimetría. Se estudió además la porosidad accesible al agua, densidad aparente, permeabilidad al gas, resistencia a compresión y carbonatación acelerada. En general, un aumento en la adición produjo una reducción del rendimiento de los morteros. Se observó, sin embargo, una reducción de la permeabilidad a los gases con porcentajes de adición de hasta el 33%. Con valores del 16% de sustitución, mejoraron las resistencias mecánicas y la resistencia frente a la carbonatación.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Composite cement mortars based on marine sediments and oyster shell powder

Ez-zaki¹,

Diouri²,

Kamali-Bernard³

et al. 2016

Mater. construcc.

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“…The approach is therefore innovative with regard to the existing studies on reuse of sediment in civil engineering which focus only on the environmental or geotechnical aspects (Marot, 1994;Boutouil, 1998;Rey, 1999;Colin, 2003;Lemée, 2006;Agostini et al, 2007;Rekik, 2007;Lafhaj et al, 2008;Nguyen, 2008;Duan, 2008;Scordia et al, 2008;Tran, 2009;Brakni et al, 2009;Zentar et al, 2009;Agostini et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Trace element mobility in a polluted marine sediment after stabilisation with hydraulic binders

Saussaye

Hamdoun

Leleyter

et al. 2016

Marine Pollution Bulletin

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The management of dredged marine sediment is an issue for many harbours, particularly when contaminant concentrations prevent disposal at sea. The stabilisation/solidification of the sediments with hydraulic binders for a use in road subgrade layer is a potential alternative solution. However, the environmental acceptability is not yet fully established. This paper presents the results of a case study to comprehensively determine the stabilisation of As, Cd, Cr, Cu, Ni, Pb and Zn. After demonstrating that stabilisation/solidification affects the microstructure of the sediment, a mobility study is realised (single, sequential and kinetic extractions). According to the regulatory/ technical guidelines the studied elements do not pose a risk to the environment. However, results from more complex mobility studies reveal that stabilisation in the short term is only effective for Ni while other elements are mobilised after treatment by at least one type of extraction. Stabilisation in the long term is not universally effective.

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“…DM can be reused in material for cement composites [4], road construction [5], and brick production through processing the deposit [6]. It can also be used to manufacture artificial aggregates [7], and in stability research as backfill material [8].…”

Section: Introductionmentioning

confidence: 99%