Influence of TiO2 on the Physical and Mechanical Properties of Concretes: A review

This document discusses the impact of adding Titanium dioxide (TiO2) as a chemical photocatalyst additive on the physical and mechanical properties of various types of concrete. The research explores the strength, durability, workability, and structure of these materials under normal conditions and challenging environments like extreme temperatures, and exposure to CO2, gamma-ray, and electromagnetic waves. It also delves into the ideal dosages of TiO2. The results indicate that substituting cement with TiO2 in concrete enhances the hydration process, encourages the formation of C-S-H gel, fills voids, increases density, boosts strength, and reduces permeability while compromising workability. Moreover, TiO2 enhances the concrete's resistance to water absorption, acid and chloride attacks, and improves its ability to absorb gamma-ray and electromagnetic waves. However, exceeding a specific TiO2 content threshold may diminish resistance and durability. Therefore, limiting the amount of TiO2 used and considering other additives in conjunction with TiO2 is recommended. This study offers valuable insights for civil engineers to determine the optimal TiO2 percentage and its compatibility with different additives. Furthermore, researchers can leverage this study to pinpoint areas for further exploration in this field.

Keywords:

TiO2 , Concrete , Photocatalyst , Strength , Durability , C-S-H