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Materials 2013, 6(5), 1920-1939; doi:10.3390/ma6051920

Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

1,* , 1
1 Department of Technology, University of Naples "Parthenope", Centro Direzionale, Is. C4, Napoli 80143, Italy 2 Department of Structures for Engineering and Architecture, University of Naples "Federico II", Naples 80125, Italy
* Author to whom correspondence should be addressed.
Received: 6 March 2013 / Revised: 24 April 2013 / Accepted: 6 May 2013 / Published: 10 May 2013
(This article belongs to the Special Issue Geopolymers and Geopolymeric Materials)
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In this study the development of a metakaolin based geopolymeric mortar to be used as bonding matrix for external strengthening of reinforced concrete beams is reported. Four geopolymer formulations have been obtained by varying the composition of the activating solution in terms of SiO2/Na2O ratio. The obtained samples have been characterized from a structural, microstructural and mechanical point of view. The differences in structure and microstructure have been correlated to the mechanical properties. A major issue of drying shrinkage has been encountered in the high Si/Al ratio samples. In the light of the characterization results, the optimal geopolymer composition was then applied to fasten steel fibers to reinforced concrete beams. The mechanical behavior of the strengthened reinforced beams was evaluated by four-points bending tests, which were performed also on reinforced concrete beams as they are for comparison. The preliminary results of the bending tests point out an excellent behavior of the geopolymeric mixture tested, with the failure load of the reinforced beams roughly twice that of the control beam.
Keywords: geopolymers; drying shrinkage; EB-FRP; metakaolin geopolymers; drying shrinkage; EB-FRP; metakaolin
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ferone, C.; Colangelo, F.; Roviello, G.; Asprone, D.; Menna, C.; Balsamo, A.; Prota, A.; Cioffi, R.; Manfredi, G. Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer. Materials 2013, 6, 1920-1939.

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