Effect of the SiO2 /Al2 O3 and Na2 O/SiO2 ratios on the properties of geopolymers based on MK


  • Erich Rodríguez Universidad del Valle
  • Ruby Mejía de Gutiérrez Universidad del Valle
  • Susan Bernal Universidad del Valle
  • Marisol Gordillo Universidad del Valle


Geopolymer, metakaolin, alkali-activation, novel ceramics


In this work, the effects of the molar ratios SiO2 /Al2 O3 (3.0 – 4.0) and Na2 O/ SiO2 (0.25 – 0.40) on the compression strength and the autogenous shrinkage of geopolymers based on Metakaolin (MK) were investigated. 16 types of geopolymeric mixtures activated with a solution of sodium silicate and sodium hydroxide were evaluated. Compressive strength and autogenous deformations were recorded. The materials produced were characterized by using different techniques X-ray diffraction (XRD), Fourier transform infrared (FTIR) and thermogravimetry (TG / DTG). The results show that the properties of the geopolymers systems are affected by the proportions of Silicon (Si), aluminum (Al) and Sodium (Na) available on the mix, which in turn determines the microstructure of the material. The best mechanical performance at early age and the minimal contraction were obtained with a ratio of SiO2 /Al2 O3 3.0 and Na2 O/SiO2 0.25.

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Author Biographies

Erich Rodríguez, Universidad del Valle

Grupo de Materiales Compuestos

Ruby Mejía de Gutiérrez, Universidad del Valle

Grupo de Materiales Compuestos

Susan Bernal, Universidad del Valle

Grupo de Materiales Compuestos

Marisol Gordillo, Universidad del Valle

Grupo de Materiales Compuestos


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How to Cite

Rodríguez , E., Mejía de Gutiérrez, R., Bernal, S., & Gordillo, M. (2013). Effect of the SiO2 /Al2 O3 and Na2 O/SiO2 ratios on the properties of geopolymers based on MK. Revista Facultad De Ingeniería Universidad De Antioquia, (49), 30–41. Retrieved from https://revistas.udea.edu.co/index.php/ingenieria/article/view/15884