Effect of TiO₂ Addition on Mortars: Characterization and Photoactivity

• Main Authors: M. J. Hernández-Rodríguez, R. Santana Rodríguez, R. Darias, O. González Díaz, J. M. Pérez Luzardo, J. M. Doña Rodríguez, E. Pulido Melián
• Format: Article
• Language: English
• Published: MDPI AG 2019-06-01
• Series: Applied Sciences
• Subjects: mortar; cement; TiO₂; NOx; photocatalysis
• Online Access: https://www.mdpi.com/2076-3417/9/13/2598

In this study, mortar specimens were prepared with a cement:sand:water ratio of 1:3:0.5, in accordance with standard EN196-1. Portland CEM I 52.5 R grey (G) and white (W) cements were used, together with normalised sand and distilled water. Different amounts of TiO₂ photocatalyst were incorporated in the preparation of the mortar samples. The effect of the addition of TiO₂ was studied on mechanical properties of the mortar and cement including compressive and flexural strength, consistency (the flow table test), setting time and carbonation. Characterization techniques, including thermogravimetry, mercury porosimetry and X-ray diffraction spectroscopy (XRD), were applied to study the physico-chemical properties of the mortars. It was shown that adding the photocatalyst to the mortar had no negative effect on its properties and could be used to accelerate the setting process. Specimen photoactivity with the incorporated photocatalyst was tested for NOx oxidation in different conditions of humidity (0% RH and 65% RH) and illumination (Vis or Vis/UV), with the results showing an important activity even under Vis radiation.