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The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete

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10.1680/jgeot.20.P.259
 
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Spagnoli, Giovanni
Romero Morales, Enrique EdgarMés informacióMés informacióMés informació
Fraccica, Alessandro
Arroyo Alvarez de Toledo, MarcosMés informacióMés informacióMés informació
Gómez Bonilla, Rodrigo AndrésMés informacióMés informació
Document typeArticle
Defense date2022-05
PublisherThomas Telford
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
An attractive approach to reduce the carbon dioxide footprint of deep soil mixing (DSM) is to replace Portland cement-based binders by geopolymers based on metakaolin. Safe design requires a good understanding of the mechanical and hydraulic properties of the improved ground, but very little is known about metakaolin–soil mixtures. For instance, shrinkage during curing is a significant issue for metakaolin-based concretes but has not been previously studied in soilcretes. In this work the permeability and strength of sand- and silty sand-based metakaolin soilcretes are studied under different curing conditions. The development of microcracks induced by geopolymer shrinkage is confirmed through a microstructural study using mercury intrusion porosimetry, scanning electron microscopy and X-ray computed tomography. The influence of microporosity and binder filling on permeability and strength is clarified adapting well-established soil models. A modified Kozeny–Carman formulation is proposed for permeability. A mixture ratio model is calibrated to represent strength. In general, the metakaolin-stabilised materials present excellent mechanical and hydraulic properties, although these are very sensitive to curing conditions.
CitationSpagnoli, G. [et al.]. The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete. "Géotechnique", Maig 2022, vol. 72, núm. 5, p. 455-469. 
URIhttp://hdl.handle.net/2117/346606
DOI10.1680/jgeot.20.P.259
ISSN0016-8505
Publisher versionhttps://www.icevirtuallibrary.com/doi/abs/10.1680/jgeot.20.P.259
Other identifiershttps://www.researchgate.net/publication/346050906_The_effect_of_curing_conditions_on_the_hydromechanical_properties_of_a_metakaolin-based_soilcrete
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  • Doctorat en Enginyeria del Terreny - Articles de revista [63]
  • MSR - Mecànica del Sòls i de les Roques - Articles de revista [280]
  • Departament d'Enginyeria Civil i Ambiental - Articles de revista [2.811]
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