Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

Materials

Claudio Ferone²  Francesco Colangelo²  Giuseppina Roviello²  Domenico Asprone¹  Costantino Menna¹  Alberto Balsamo¹  Andrea Prota¹  Raffaele Cioffi² 

[1] Department of Structures for Engineering and Architecture, University of Naples “Federico II”, Naples 80125, Italy; E-Mails:;Department of Technology, University of Naples “Parthenope”, Centro Direzionale, Is. C4, Napoli 80143, Italy; E-Mails:

关键词: geopolymers;    drying shrinkage;    EB-FRP;    metakaolin;   

DOI  :  10.3390/ma6051920

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.