Investigating the effects of TiO2 on RCC pavements containing class F Fly Ash via RSM

This study examines the effects of replacing a portion of Ordinary Portland Cement with TiO2 (0, 5, 10%) and class F Fly Ash (FFA) with varying percentages of 0, 30, and 60% on the physical and mechanical properties of Roller Compacted Concrete (RCC) using the soil compaction technique. Response Surface Methodology (RSM) was employed to assess compressive strength after 28 and 90 days, flexural and split tensile strengths, and water absorption after 90 days. The findings from the tests revealed that TiO2 alone in the samples improved their compressive, flexural, and split tensile strengths while reducing porosity and water absorption. The most significant improvement was observed with the use of 10% TiO2. On the other hand, FFA alone led to decreased strength, water absorption, and porosity, with the most favorable results seen at a 30% FFA content. Combining FFA and TiO2 resulted in weakened strengths. Increasing TiO2 with a lower amount of FFA improved water absorption and porosity; however, this improvement lessened as the FFA content increased. The RSM analysis indicated that samples containing only 10% TiO2 and 11.53% FFA exhibited the highest strength and optimal water absorption after 90 days.

Investigating the effects of TiO2 on RCC pavements containing class F Fly Ash via RSM Keywords:

TiO2 , RCC , Fly Ash , RSM , Water Absorption , Strength