Comparing the use of GGBS and MgO in laboratory and field trial mixing of contaminated made ground soil

M. Allagoa

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Soil Stabilization II

ABSTRACT: Waste disposal to landfill is generally regarded as the least favoured waste management option hazardous industrial wastes that cannot be recycled or destroyed will continue to be produced and require safe disposal. Despite incomplete information regarding the longretention properties of the materials produced by solidification/stabilization (S/S), nlack of other effective remediation methods, is driving these types of technologies to become widely used in many countries. In France and the USA for example, S/S is now seen as a major treatment technology for hazardous wastes. In this Magnesium oxide (MgO) was used on a made ground field trial soil. This aim requires comparison between the binders and was carried out by performing two tests: physical and chemical tests designed to provide understanding of i. the processes involved in a particular test; ii. the durability of the products/ sample; and iii. their environmental impacts. Recommendations are given as to the effectiveness of these combined binders on the field soil.

RÉSUMÉ: L'élimination des déchets à la décharge est généralement déchets moins privilégiée- les déchdétruits continueront à être produits et incomplète concernant la durabilité à long terme et les propriétés de rétention matériaux produits par la solidification/ stabilisation (S/Sméthodes d'assainissement efficaces, conduit ces types de technologies à être largement utilisés dans de nombreux pays. En France et aux Étatscomme une technologie de traitement importante pour les déchets dangereux. Dans cet articscories de haut fourneau granulées (GGBS) et l'oxyde de magnésium (MgO) a été utilisé sur und™essai sur le terrain. Cet objectif nécessite une comparaison entre les liants et a été réalisé en effectuant deux tests: des tests physiques et chimiles processus impliqués dans un test particulier; ii) la durabilité des produits/échantillon et iii) leurs impacts environnementaux. Des recommandations sont suggérées quant à l'efficacité de ces liants combinés sur le sol sur le terrain. Key words: Solidification/stabilisation, Ground granulated blast furnace slag, Magnesium oxide, laboratory mixing, field mixing. 1. INTRODUCTION Urban demand has increased the need to redevelop contaminated land. New legislation for land management has actively discouraged previously acceptable dig and dump practices. This has encouraged in-situ remediation approaches, for which stabilisation/ solidification (S/S) is particularly suitable for treating metaand organic contamination. The in-situ treatment methodology utilises modified continuous flight auger drilling and injection techniques. The treatment materials are injected in a slurry form into the contaminated ground and mixed with the soil in-situ. The prime objective is to ensure that the contaminated soil and treatment media are mixed homogeneously. COMPARING THE USE OF GGBS AND MGO IN LABORATORY AND FIELD TRIAL MIXING OF CONTAMINATED MADE GROUND SOIL Waste disposal to landfill is generally regarded as the least favoured waste management option that cannot be recycled or destroyed will continue to be produced and require safe disposal. Despite incomplete information regarding the long-term durability and waste retention properties of the materials produced by solidification/stabilization (S/S), necessity, and the lack of other effective remediation methods, is driving these types of technologies to become widely used in many countries. In France and the USA for example, S/S is now seen as a major treatment technology for hazardous wastes. In this paper, Ground Granulated Blast furnace Slag (GGBS) and Magnesium oxide (MgO) was used on a made ground field trial soil. This aim requires comparison between the binders and was carried out by performing two tests: physical and chemical tests rovide understanding of i. the processes involved in a particular test; ii. the durability of the products/ sample; and iii. their environmental impacts. Recommendations are given as to the effectiveness of these combined binders on the field soil. L'élimination des déchets à la décharge est généralement considéré comme l'option de gestion des les déchets industriels dangereux qui ne peuvent pas être recyclés ou détruits continueront à être produits et exiger l'élimination sans danger. Malgré l™information incomplète concernant la durabilité à long terme et les propriétés de rétention des déchets des par la solidification/ stabilisation (S/S), la nécessité, et l'absence d'autres efficaces, conduit ces types de technologies à être largement utilisés . En France et aux États-Unis par exemple, la S/S est désormais considérée comme une technologie de traitement importante pour les déchets dangereux. Dans cet articscories de haut fourneau granulées (GGBS) et l'oxyde de magnésium (MgO) a été utilisé sur und™essai sur le terrain. Cet objectif nécessite une comparaison entre les liants et a été réalisé en effectuant deux tests: des tests physiques et chimiques destinés à permettre la compréhension deles processus impliqués dans un test particulier; ii) la durabilité des produits/échantillon et iii) leurs impacts environnementaux. Des recommandations sont suggérées quant à l'efficacité de ces liants Solidification/stabilisation, Ground granulated blast furnace slag, Magnesium oxide, laboratory Urban demand has increased the need to ed land. New legislation for land management has actively discouraged previously acceptable dig and dump practices. situ remediation approaches, for which stabilisation/ solidification (S/S) is particularly suitable for treating metal situ treatment methodology utilises modified continuous flight auger drilling and injection techniques. The treatment materials are injected in a slurry form into the contaminated ground and mixed with The prime objective is to ensure that the contaminated soil and treatment media Stabilisation/ solidification (S/S) is a technology aimed at changing the physical/chemical properties of (hazardous) waste materials in order to reduce the release of contaminations in the environment. This technology aims at changing the process of release from a percolation dominated surface/ regime to a diffusion surface dissolution dominated regime fi(van der sloot and van Zomeren, 2005)fl France is equipped with 13 S/S plants all located on hazardous waste landfill facility.7 plants belong to the SI5 to the VEOLIA group and 1 to SECHE group. In average, 52% of the waste entering these Heavy waste Landfills are treated by S/S which leads to a global volume of around 600000 tons of waste per year treated by S/S on Heavy Waste disposal to landfill is generally regarded as the least favoured waste management option - that cannot be recycled or destroyed will continue to be produced and term durability and waste ecessity, and the lack of other effective remediation methods, is driving these types of technologies to become widely used in many countries. In France and the USA for example, S/S is now seen as a major treatment paper, Ground Granulated Blast furnace Slag (GGBS) and Magnesium oxide (MgO) was used on a made ground field trial soil. This aim requires comparison between the binders and was carried out by performing two tests: physical and chemical tests rovide understanding of i. the processes involved in a particular test; ii. the durability of the products/ sample; and iii. their environmental impacts. Recommendations are given as to the considéré comme l'option de gestion des ets industriels dangereux qui ne peuvent pas être recyclés ou sans danger. Malgré l™information des déchets des ), la nécessité, et l'absence d'autres efficaces, conduit ces types de technologies à être largement utilisés Unis par exemple, la S/S est désormais considérée comme une technologie de traitement importante pour les déchets dangereux. Dans cet article, les scories de haut fourneau granulées (GGBS) et l'oxyde de magnésium (MgO) a été utilisé sur un sol d™essai sur le terrain. Cet objectif nécessite une comparaison entre les liants et a été réalisé en ques destinés à permettre la compréhension de : I) les processus impliqués dans un test particulier; ii) la durabilité des produits/échantillon et iii) leurs impacts environnementaux. Des recommandations sont suggérées quant à l'efficacité de ces liants Solidification/stabilisation, Ground granulated blast furnace slag, Magnesium oxide, laboratory Stabilisation/ solidification (S/S) is a technology aimed at changing the physical/chemical properties of (hazardous) waste materials in order to reduce the release of contaminations in This technology aims at changing the process of lease from a percolation dominated surface/ regime to a diffusion surface dissolution dominated regime fi(van der sloot and van France is equipped with 13 S/S plants all located on hazardous waste 7 plants belong to the SITA group, 5 to the VEOLIA group and 1 to SECHE group. In average, 52% of the waste entering these Heavy waste Landfills are treated by S/S which leads to a global volume of around 600000 tons of waste per year treated by S/S on Heavy

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