A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete
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. ; Peer Reviewed ; Postprint (author's final draft)
The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete
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. ; Peer Reviewed ; Postprint (author's final draft)
The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete
Spagnoli, Giovanni (author) / Romero Morales, Enrique Edgar (author) / Fraccica, Alessandro (author) / Arroyo Álvarez de Toledo, Marcos (author) / Gómez Bonilla, Rodrigo Andrés (author) / Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental / Universitat Politècnica de Catalunya. Doctorat en Enginyeria del Terreny / Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
2022-05-01
doi:10.1680/jgeot.20.P.259
Article (Journal)
Electronic Resource
English
Mechanical properties of soilcrete mixtures modified with metakaolin
| Online Contents | 2013
Mechanical properties of soilcrete mixtures modified with metakaolin
| British Library Online Contents | 2013
| Taylor & Francis Verlag | 1997
| British Library Online Contents | 1997
| Online Contents | 1997