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Environments 2017, 4(3), 56; https://doi.org/10.3390/environments4030056

Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media

1
Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università Federico II, 80125 Napoli, Italy
2
Dipartimento di Ingegneria, Università Parthenope, 80143 Napoli, Italy
*
Author to whom correspondence should be addressed.
Received: 17 July 2017 / Revised: 3 August 2017 / Accepted: 9 August 2017 / Published: 11 August 2017
(This article belongs to the Special Issue Environmentally Friendly Geopolymer Composites)
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Abstract

The extent of the dissolution of aluminosilicate compounds is crucial, since the amount of Si and Al initially dissolved is essential for the following polycondensation and can strongly influence physical and mechanical performances of the final product. In order to set up a method to test the ability of a material to react in alkaline media, different aluminosilicate sources have been selected: a mineral resource (a zeolitized tuff), an industrial by product (silt from washing process of construction and demolition wastes), a heat treated clay sediment and a calcined clay (metakaolin). Two test methods, static and dynamic, have been applied to evaluate the attitude of a silicoaluminate precursor to give a geopolymerization reaction. In particular, a fixed amount of precursor was put into contact with a alkaline solution under continuous stirring or in static conditions at 60 °C for fixed times. The dynamic test method seems to be more suitable, since it is faster and requires lower amounts of reactants (solution). Moreover, the dynamic test provides a reactivity sequence (ordered from the more to the less reactive precursor) metakaolin > treated clay sediment > zeolitized tuff ≈ silt both for Si and Al release, which is coherent with the performances of geopolymers obtained by using the above precursors. View Full-Text
Keywords: raw materials; geopolymer; solubility test; alkaline media raw materials; geopolymer; solubility test; alkaline media
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Liguori, B.; Capasso, I.; De Pertis, M.; Ferone, C.; Cioffi, R. Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media. Environments 2017, 4, 56.

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