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Soil stabilisation using alkaline activation of fly ash for self compacting rammed earth construction

Lookup NU author(s): Nuno Cristelo, Professor Stephanie Glendinning

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Abstract

This paper studies the effectiveness of alkaline activation of low-calcium fly ash on the improvement of residual granitic soils to be used on rammed-earth construction. Different liquid:solid ratios, alkali concentrations and Na2O:ash ratios were tested. Effect of calcium hydroxide, sodium chloride and concrete superplasticiser is also reported. Compressive strength up to 7 days at 60 degrees C was determined. Results show that there is an optimum value for the activator:solids ratio and the alkali concentration, and that a decrease in the Na2O:ash ratio results in a strength increase. No improvement was observed with the sodium chloride or the superplasticiser, while the calcium produced only a short term increase in strength. SEM/EDS analysis were used to analyse microstructural development, showing that strength is fairly related to the Si:Al and Na:Si ratios. (C) 2012 Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Cristelo N, Glendinning S, Miranda T, Oliveira D, Silva R

Publication type: Article

Publication status: Published

Journal: Construction and Building Materials

Year: 2012

Volume: 36

Pages: 727-735

Print publication date: 01/11/2012

ISSN (print): 0950-0618

ISSN (electronic):

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.conbuildmat.2012.06.037

DOI: 10.1016/j.conbuildmat.2012.06.037


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