Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of lime treatments on marls
https://orcid.org/0000-0001-7834-5816
AbstractMarly clay was treated with calcitic and Mg-rich lime in order to determine the influence of the clay's high carbonate content on the stabilization effectiveness. The evolution of mineralogical and physical properties over the course of the treatment were studied using XRD, TEM, SEM, elemental analysis, TG, granulometry, and nitrogen sorption and correlated with the marly clay's improved geotechnical behaviour. Only a small portion of smectites and other clay minerals dissolved upon lime treatment. Changes in clay mineralogy had, thus, only very limited influence in the improvement of the material's plasticity and swelling behaviour, which was rather modified by an increase in particle size. This increase was primarily caused by aggregation induced by calcium silicate aluminium hydrate (C-(A)-S-H) formation, whereas flocculation had an only minor effect. After the initial improvement, disaggregation of clay particles occurred which resulted in a particle size decrease, most likely, caused by carbonation of C-(A)-S-H phases. These findings question the effectiveness of lime stabilization for marl using currently applied standard treatment protocols.
HighlightsCarbonates affect lime stabilization of clay-rich, marly soils.Fast but limited transformation of clay minerals into CSH is achieved.Clay particle aggregation by CSH is the main mechanism in soil stabilization.CSH carbonation and clay particle disaggregation affect long-term stabilization.
Effects of lime treatments on marls
https://orcid.org/0000-0001-7834-5816
AbstractMarly clay was treated with calcitic and Mg-rich lime in order to determine the influence of the clay's high carbonate content on the stabilization effectiveness. The evolution of mineralogical and physical properties over the course of the treatment were studied using XRD, TEM, SEM, elemental analysis, TG, granulometry, and nitrogen sorption and correlated with the marly clay's improved geotechnical behaviour. Only a small portion of smectites and other clay minerals dissolved upon lime treatment. Changes in clay mineralogy had, thus, only very limited influence in the improvement of the material's plasticity and swelling behaviour, which was rather modified by an increase in particle size. This increase was primarily caused by aggregation induced by calcium silicate aluminium hydrate (C-(A)-S-H) formation, whereas flocculation had an only minor effect. After the initial improvement, disaggregation of clay particles occurred which resulted in a particle size decrease, most likely, caused by carbonation of C-(A)-S-H phases. These findings question the effectiveness of lime stabilization for marl using currently applied standard treatment protocols.
HighlightsCarbonates affect lime stabilization of clay-rich, marly soils.Fast but limited transformation of clay minerals into CSH is achieved.Clay particle aggregation by CSH is the main mechanism in soil stabilization.CSH carbonation and clay particle disaggregation affect long-term stabilization.
Effects of lime treatments on marls
https://orcid.org/0000-0001-7834-5816
AbstractMarly clay was treated with calcitic and Mg-rich lime in order to determine the influence of the clay's high carbonate content on the stabilization effectiveness. The evolution of mineralogical and physical properties over the course of the treatment were studied using XRD, TEM, SEM, elemental analysis, TG, granulometry, and nitrogen sorption and correlated with the marly clay's improved geotechnical behaviour. Only a small portion of smectites and other clay minerals dissolved upon lime treatment. Changes in clay mineralogy had, thus, only very limited influence in the improvement of the material's plasticity and swelling behaviour, which was rather modified by an increase in particle size. This increase was primarily caused by aggregation induced by calcium silicate aluminium hydrate (C-(A)-S-H) formation, whereas flocculation had an only minor effect. After the initial improvement, disaggregation of clay particles occurred which resulted in a particle size decrease, most likely, caused by carbonation of C-(A)-S-H phases. These findings question the effectiveness of lime stabilization for marl using currently applied standard treatment protocols.
HighlightsCarbonates affect lime stabilization of clay-rich, marly soils.Fast but limited transformation of clay minerals into CSH is achieved.Clay particle aggregation by CSH is the main mechanism in soil stabilization.CSH carbonation and clay particle disaggregation affect long-term stabilization.
Effects of lime treatments on marls
Elert, Kerstin (Autor:in) / Nieto, Fernando (Autor:in) / Azañón, José Miguel (Autor:in)
Applied Clay Science ; 135 ; 611-619
17.10.2016
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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