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Clayey soil stabilization using geopolymer and Portland cement

Ghadir, P; Ranjbar, N; (2018) Clayey soil stabilization using geopolymer and Portland cement. Construction and Building Materials , 188 pp. 361-371. 10.1016/j.conbuildmat.2018.07.207. Green open access

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Abstract

This study compares the mechanical performance of clayey soil stabilization using volcanic ash (VA) based geopolymer and ordinary Portland cement (OPC). The effects of curing conditions and time, alkali activator/clay and alkali activator molarity, and VA/clay ratio are determined. The compressive strength of the untreated clayey soil specimens could be increased from 0.2 to 4 MPa and 2 to 12 MPa at the OC and DC conditions, respectively, when the soil partially replaced by 15 wt% of the binders. It is observed that geopolymer treatment is more efficient at the dry conditions (DC) while the Portland cement is superb at the wet environments (OC). This difference is associated with the role of water and pH in the kinetics of geopolymerization and the Portland cement hydration. Moreover, increasing the molarity of alkali activator and alkali activator/clay improve the compressive strength of the geopolymer treated soil. Besides, the higher energy absorption in all geopolymer specimens shows the superior ductility of this material in comparison with OPC.

Type: Article
Title: Clayey soil stabilization using geopolymer and Portland cement
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.conbuildmat.2018.07.207
Publisher version: http://doi.org/10.1016/j.conbuildmat.2018.07.207
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Soil stabilization, Geopolymer, Cement, Volcanic ash, Clay, Natural pozzolan
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10055418
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