Durability Aspects of Concrete Containing Nano Titanium Dioxide
Garima Rawat, Sumit Gandhi, Yogesh Iyer Murthy
Appears on pages(s):
chloride penetration; durability; mechanical properties; nano-TiO2; slump
The current paper investigates the effects of partial cement replacement with Nano-TiO2 (NT) in varying weight proportions in concrete. In the C20/25 grade of concrete, Nano-TiO2 (NT) was added by weight of cement with partial replacement of 0%, 0.5%, 1.5%, 2.0%, 2.5%, and 3.0% using Portland Pozzolana Cement. The physical and mechanical properties of the resulting concrete were assessed, as well as aspects of durability such as sorptivity and non-destructive tests (NDT) such as Ultrasonic Pulse Velocity (UPV). Compared with the control mixture, the fresh concrete produced showed a drastic reduction in slump with increasing percentage replacement, with a 54% reduction at 3.0% replacement. Furthermore, for 1.5% Nano-TiO2 (NT), the compressive, flexural, and split tensile strengths peaked at 7, 28, 56, and 90 days, after which the values decreased. The addition of Nano-TiO2 (NT) improved the homogeneity and integrity of the resulting concrete based on the UPV values. As the percentage of Nano-TiO2 (NT) increased, chloride penetration decreased. From microstructural studies, it can be concluded that Nano-TiO2 (NT) acts as a filler material and can be used as a partial replacement for cement in concrete up to 2% by weight.