Abstract

RODRIGUEZ, Erich; MEJIA DE GUTIERREZ, Ruby; BERNAL, Susan  and  GORDILLO, Marisol. Effect of the SiO₂/Al₂O₃ and Na₂O/SiO₂ratios on the properties of geopolymers based on MK. Rev.fac.ing.univ. Antioquia [online]. 2009, n.49, pp.30-41. ISSN 0120-6230.

In this work, the effects of the molar ratios SiO₂/Al₂O₃ (3.0 - 4.0) and Na₂O/ 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/Al₂O₃ 3.0 and Na₂O/SiO₂0.25.

Keywords : Geopolymer; metakaolin; alkali-activation; novel ceramics.