Paper Title
Facade Building Industry with Cement Composites Containing Silica Fume, Nano-Silica and Tio2

Abstract
Using mineral admixtures in cement composites as a way to improve their mechanical and durability properties is a common practice in concrete technology. Among them silica fume and nano-silica effectively influence the composite's early and long-term properties. Due to the limited particle size distribution of nano and micro silica it is expected that the incorporation of some mineral additives with a size of greater than 500 nm may result in better mechanical and durability performance because of the filler effect. In this study, the effect of different percentages of TiO2 on water absorption of cement composites containing nano-silica and silica fume was investigated. The results showed that the addition of TiO2 had a positive effect on decreasing of water absorption. Water absorption was significantly reduced when silica fume was used as partial replacement for cement. It shows that silica fume incorporation leads to better durability performance of cement composites. Also incorporation of TiO2 considerably lowered the water absorption due to the filler effect. Keywords - Nanotechnology, water absorption, Mineral admixtures, Titanium Dioxide, Silica fume, Nano-silica