TiO2 is a primary photocatalytic ingredient. If incorporated into building materials, it can keep surfaces cleanand significantly reduce smog-forming air pollutants. Many of researchers have focused on the ability of nano TiO2 toreduce NOx emissions or other pollutants. However, developing countries are unable to utilize this high cost technology and should at least try to protect their structures from pollution and improve their environment.Some studies proved that micro TiO2(commercial grade) also has photocatalytic properties. Utilization of small amount of this powder in concrete would not be expensive. The effect of TiO2 on different properties of mortars is investigated including flow in the fresh state, compressive strength, shrinkage, sulfate resistance and carbonation. The results indicated that incorporating TiO2 in mortars decreased the workability as mortars became more sticky and dry as TiO2 percentage increased. The compressive strength was also reduced in TiO2 containing samples compared to the control samples especially at early ages.However, using TiO2powder as an additive in mortar can be useful for giving better performance such as reducing carbonation. No samples in the current investigation showed signs of cracking or expansive mass loss due to sulfate exposure. It is recommended that TiO2 is used as an additive to the mortar plaster to help in controlling the air pollution problem and at the same time improve air pollution problem. |
