Corrosion Performance of Nano-TiO-Modified Concrete under a Dry-Wet Sulfate Environment.

This study compared the effects of the sulfate dry-wet cycle on the properties of ordinary concrete and nano-TiO-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simulations carried out using the PFC2D software are also presented for comparison. The results show the following: (1) with an increase in dry-wet cycles, the damage to the concrete gradually increased, and adding nano-TiO into ordinary concrete can improve the material's sulfate resistance; (2) after 50 sulfate dry-wet cycles, the mass loss rate of ordinary concrete was -3.