Compressive strength and microstructural evolution of metakaolin geopolymers exposed at high temperature

  • O. Burciaga-Díaz Ingenieria Cerámica, Cinvestav IPN Unidad Saltillo, Av. Industria Metalúrgica No. 1062, Parque Industrial Ramos Arizpe, Coahuila, México
  • J. I. Escalante-García Centro de Investigación y de Estudios Avanzados del IPN Unidad Saltillo, Carretera Saltillo - Monterrey km 13, PO box 663, Saltillo, Cohauila CP 25 000, México
  • R. X. Magallanes-Rivera Materiales de construcción, UANL Fac. de Ing. Civil, Av.Universidad s/n, Cd. Universitaria San Nicolás de los Garza, Nuevo León
DOI: https://doi.org/10.21041/ra.v5i1.77
Keywords: Geopolymers, metakaolin, thermal performance, compressive strength, microstructures.

Abstract

This research presents results of compressive strength and microstructural evolution of geopolymer pastes exposed to high temperatures. Pastes of molar composition SiO2/Al2O3 (2.6-3.0), Na2O/Al2O3 (0.55 to 0.7), and H2O/solid (0.53 to 0.57) were elaborated blending metakaolin and sodium silicate solutions containing NaOH. The effect of the chemical composition on the development of compressive strength was investigated, and 3 pastes with high mechanical strength were chosen to be exposed to 200, 500 and 800 ° C, characterizing their microstructural evolution and compressive strength. Before to high temperature exposure, the geopolymers developed of up to 80MPa, and after their exposition, the loss of strength was strongly depended of the ratio SiO2/Al2O3. Results of X-ray diffraction, Infrared Spectroscopy and Scanning Electron Microscopy, suggest that the reorganization of the silica gel and the evaporation of water from the microstructures, reduce the thermal stability of geopolymers exposed to high temperature.

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Published
2015-01-30
How to Cite
Burciaga-DíazO., Escalante-GarcíaJ. I., & Magallanes-Rivera, R. X. (2015). Compressive strength and microstructural evolution of metakaolin geopolymers exposed at high temperature. Revista ALCONPAT, 5(1), 58 - 72. https://doi.org/10.21041/ra.v5i1.77
Issue
Vol. 5 No. 1 (2015)
Section
Basic Research

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