The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete
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hdl:2117/346606
Tipus de documentArticle
Data publicació2022-05
EditorThomas Telford
Condicions d'accésAccés obert
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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.
CitacióSpagnoli, 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.
ISSN0016-8505
Versió de l'editorhttps://www.icevirtuallibrary.com/doi/abs/10.1680/jgeot.20.P.259
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