**Luis A. Guzmán-Aponte 1, Ruby Mejía de Gutiérrez 1,\* and Anibal Maury-Ramírez <sup>2</sup>**


Academic Editor: Silvia Gross Received: 26 October 2017; Accepted: 12 December 2017; Published: 15 December 2017

**Abstract:** The effect of the TiO2 addition on the physicomechanical properties of a geopolymer system based on metakaolin (MK) and hydroxide and potassium silicate as activators is presented in this article. Three different liquid-solid systems (0.35, 0.40, and 0.45) and two titanium additions were investigated (5% and 10% of the cement content). The flowability, setting time, and mechanical strength of the geopolymer mixtures and their microstructural characteristics were evaluated using techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). It was concluded that a percentage of up to 10% TiO2 does not affect the mechanical properties of the geopolymer, although it does reduce the fluidity and setting times of the mixture.

**Keywords:** geopolymer; metakaolin; titanium oxide; physical and mechanical properties
