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Environments 2017, 4(4), 80; doi:10.3390/environments4040080

Mechanical Behaviour of Soil Improved by Alkali Activated Binders

1
Department of Civil and Mechanical Engineering, University of Cassino and Southern of Lazio, G. Di Biasio, 43, 03043 Cassino, Italy
2
Department of Technology and INSTM Research Unit, University of Naples “Parthenope”, Centro Direzionale, Is. C4, 80143 Naples, Italy
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 8 November 2017 / Accepted: 9 November 2017 / Published: 11 November 2017
(This article belongs to the Special Issue Environmentally Friendly Geopolymer Composites)
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Abstract

The use of alkali activated binders to improve engineering properties of clayey soils is a novel solution, and an alternative to the widely diffused improvement based on the use of traditional binders such as lime and cement. In the paper the alkaline activation of two fly ashes, by-products of coal combustion thermoelectric power plants, has been presented. These alkali activated binders have been mixed with a clayey soil for evaluating the improvement of its mechanical behaviour. One-dimensional compression tests on raw and treated samples have been performed with reference to the effects induced by type of binder, binder contents and curing time. The experimental evidences at volume scale of the treated samples have been directly linked to the chemo-physical evolution of the binders, investigated over curing time by means of X Ray Diffraction. Test results showed a high reactivity of the alkali activated binders promoting the formation of new mineralogical phases responsible for the mechanical improvement of treated soil. The efficiency of alkali activated binders soil treatment has been highlighted by comparison with mechanical performance induced by Portland cement. View Full-Text
Keywords: alkali activated binders; fly ash; soil improvement; mechanical behaviour alkali activated binders; fly ash; soil improvement; mechanical behaviour
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MDPI and ACS Style

Vitale, E.; Russo, G.; Dell’Agli, G.; Ferone, C.; Bartolomeo, C. Mechanical Behaviour of Soil Improved by Alkali Activated Binders. Environments 2017, 4, 80.

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