Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media
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 abili...
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doaj-88bfb5bd52764060ad0edab594d35e452020-11-25T00:16:17ZengMDPI AGEnvironments2076-32982017-08-01435610.3390/environments4030056environments4030056Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline MediaBarbara Liguori0Ilaria Capasso1Marco De Pertis2Claudio Ferone3Raffaele Cioffi4Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università Federico II, 80125 Napoli, ItalyDipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università Federico II, 80125 Napoli, ItalyDipartimento di Ingegneria, Università Parthenope, 80143 Napoli, ItalyDipartimento di Ingegneria, Università Parthenope, 80143 Napoli, ItalyDipartimento di Ingegneria, Università Parthenope, 80143 Napoli, ItalyThe 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.https://www.mdpi.com/2076-3298/4/3/56raw materialsgeopolymersolubility testalkaline media |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Barbara Liguori Ilaria Capasso Marco De Pertis Claudio Ferone Raffaele Cioffi |
spellingShingle |
Barbara Liguori Ilaria Capasso Marco De Pertis Claudio Ferone Raffaele Cioffi Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media Environments raw materials geopolymer solubility test alkaline media |
author_facet |
Barbara Liguori Ilaria Capasso Marco De Pertis Claudio Ferone Raffaele Cioffi |
author_sort |
Barbara Liguori |
title |
Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media |
title_short |
Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media |
title_full |
Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media |
title_fullStr |
Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media |
title_full_unstemmed |
Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media |
title_sort |
geopolymerization ability of natural and secondary raw materials by solubility test in alkaline media |
publisher |
MDPI AG |
series |
Environments |
issn |
2076-3298 |
publishDate |
2017-08-01 |
description |
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. |
topic |
raw materials geopolymer solubility test alkaline media |
url |
https://www.mdpi.com/2076-3298/4/3/56 |
work_keys_str_mv |
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