Stabilization of marly expansive soils with fly ash obtained after biomass incineration (Southern Spain)
- C. Ureña 1
- J.M. Azañón 1
- J.M. Caro 1
- F.A. Corpas 2
- C. Irigaray 1
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1
Universidad de Granada
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2
Universidad de Jaén
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ISSN: 1576-5172
Year of publication: 2012
Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Issue: 13
Pages: 1010-1013
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The reduction of the damaging effects of expansive clays is the main goal of the treatments of these materials in civil works. Marly soils are widely distributed throughout SE Spain. In this region, it has been recently installed several biomass power plants. The biomass non-flammable materials are collected in the form of ashes after incineration. This article presents an experimental study of the stabilization of an expansive marly soil based on fly ash obtained after biomass incineration. To assess the mechanical properties of the stabilized soil, free swell and consistency limits tests were carried out for different curing periods. Moreover, pH was measured to evaluate its influence on the pozzolanic reactions. XRD tests were used to study the variations in the mineralogy of the soils. The study showed the potential benefit of stabilizing expansive marly soils with biomass fly ash. A percentage of 7% of additive in the mixture produced the highest decrease in the free swell value.