Stabilization of swelling clays by Mg(OH)2. Changes in clay properties after addition of Mg-hydroxide

Xeidakis, G. S.

doi:10.1016/s0013-7952(96)00047-6

Cited by 31 publications

(4 citation statements)

References 17 publications

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“…This indicates that using the layer structure of brucite to adsorb organics into its layers is not the main stabilization mechanism of brucite. Since seldom studies about the binding mechanism between brucite and organics can be found, a hypothesis was deduced that it involves simple physical adsorption alone with some chemical bonding e.g., cation exchange, complexing of the hydroxide with the organics [33]. In addition, the hydration products of MG are C-S-H, M-S-H and Ht.…”

Section: The Leachability Of Total Organicsmentioning

confidence: 99%

Time-dependent performance of soil mix technology stabilized/solidified contaminated site soils

Wang

Al‐Tabbaa

2015

Journal of Hazardous Materials

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Section: The Leachability Of Total Organicsmentioning

confidence: 99%

Time-dependent performance of soil mix technology stabilized/solidified contaminated site soils

Wang

Al‐Tabbaa

2015

Journal of Hazardous Materials

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“…Another probable way to stabilize the sulfate soils can be the replacement of calcium based additives by other metal cations, such as magnesium. Xeidakis (1996-a) and(1996b) demonstrated that the Mg(OH)2 fixing in the expansive clay layers is more rapid than that Ca(OH)2, resulting also in the clay's flocculation. He also proved the Mg(OH)2 capacity to increase the soil's pH and the theoretical possibility to generate Mg based cementitious gels.…”

Section: Introductionmentioning

confidence: 99%

Sulfate soils stabilization with magnesium-based binders

Seco

Miqueleiz

Prieto

et al. 2017

Applied Clay Science

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Sulfate soils' stabilization is a very interesting subject with technical, economic and environmental implications. The difficulty of their stabilization is due to the fact that the usual stabilizer additives are based on calcium. In these soils, sulfate combines with the calcium from the additive and the aluminum from the clay, resulting in a highly hydrated expansive mineral named ettringite. This provokes the swelling of the treated material and even its destruction. This study analyzes the result of the substitution of the calcium based additives by one alternative additive based on magnesium, an industrial byproduct named PC-8, in the stabilization of five different sulfate soils. From a mechanical point of view soils treated with PC-8 reached similar resistance values to the lime treated ones, of about 2-3 MPa for 4% dosage and 2-5 MPa for 8% dosage, being usually better with the PC-8 results than with the lime ones. When PC-8 was combined with GGBS the resistance values increased up to 11-13 MPa and the lime-GGBS reached the 6-7 MPa.The natural swelling of the soils treated with PC-8 decreased substantially and maintained constant even for immersion at long-term. In the case of the soils treated with lime, longterm swelling increased up to very high values even in the case of soils without natural swelling. XRD analysis of these samples demonstrated the existence of ettringite in 4 of the 5 soils when they were treated with lime and there was not expansive minerals in the PC-8 treated soils, agreeing with the swelling observed behavior of the soils when treated with both additives. HIGHLIGHTSThere is a potential in using magnesium oxide as a sulfate soils stabilizer.3 Magnesium oxide demonstrated a better ability as pozzolanic activator to GGBS than lime.The long-term swelling test was a good estimator of the development of expansive minerals.XRD results agree with the indirect estimation of the presence of expansive minerals.All the lime and none of the PC-8 treated soils, showed expansive behavior.

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“…Changes in those properties are due to a series of reactions, which can occur between the material and the soil. These reactions are determined by variables like temperature, composition, relative humidity, and pH [6,7]. However, while this procedure has been very effective, its use has been limited due to lack of long-term effectiveness [3,8].…”

Section: Introductionmentioning

confidence: 99%

Corrosion mitigation of buried structures by soils modification

Córdoba

Mejía

Echeverría

et al. 2011

Ingeniare. Rev. chil. ing.

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Muestras de acero al carbono fueron enterradas en el suelo arcilloso modificado con cal, ceniza volante y cemento Portland en proporción de 5 y un 10% durante 60 días. El ataque corrosivo fue evaluado mediante espectroscopía de impedancia electroquímica. Muestras de suelo arcilloso sin modificación fueron tomadas como referencia. Los productos de corrosión se caracterizaron por espectroscopía Raman. Se encontró que el suelo con la adición de cenizas volantes y el cemento Portland puede desarrollar protección contra la corrosión del acero desnudo por la modificación del óxido formado sobre muestras de acero. La lepidocrocita y goetita se encontraron como los principales componentes de la herrumbre formada en el acero enterrado en suelos modificados con cenizas volantes y cemento, mientras que la magnetita se encuentra en la herrumbre formada en el acero enterrado en suelo modificado con cal y el suelo sin modificación. De acuerdo con los resultados electroquímicos, el suelo modificado con un 5% de cenizas volantes mostró el mejor desempeño anticorrosivo. Palabras clave: Acero al carbono, corrosión en suelos, modificación de suelos, impedancia electroquímica, espectroscopía Raman.

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Stabilization of swelling clays by Mg(OH)2. Changes in clay properties after addition of Mg-hydroxide

Cited by 31 publications

References 17 publications

Time-dependent performance of soil mix technology stabilized/solidified contaminated site soils

Time-dependent performance of soil mix technology stabilized/solidified contaminated site soils

Sulfate soils stabilization with magnesium-based binders

Corrosion mitigation of buried structures by soils modification

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