The effect of titanate nanotubes on cementitious systems for UHPC application

来源 :The 14th International Congress on the Chemistry of Cement ( | 被引量 : 0次 | 上传用户:bai408
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  TiO2 are widely used as white pigment in paints and cement industry to provide aesthetic beauty and brittleness to the materials.During the last few years researchers has shown ample interest for using TiO2 as an inert material to minimize the air pollution and decoloration of volatile organic compounds by heterogeneous photocatlaytic oxidation process.Besides these surfacial effects TiO2 has shown promising effects for enhancing the mechanical properties, water permeability, improvement in the micro structures and thermal properties.Nanoscale modifications provide the means to minimize energy consumption and maximize the desired properties but cost effectiveness should also be considered in this regard.Modified hydrothermal approach have been adopted for the synthesis of titanate nanotubes with improved properties including high specific surface area 300 m2/g, outer diameter 20-70 nm and inner diameter in mesoporous region.Titanate nanotubes are not commercially available and have been used for the first time as an additive.Interaction and integration of titanate nanotube with binder matrix have been analysed.Higher tendency of nanoparticles for making agglomeration in liquid media is minimized by electrostatically stabilizing the material using different superplastisizers.Ionic interaction of titanate nanotubes was investigated by using saturated solution of Ca(OH)2.Ion chromatography and EDTA titration method have shown influential effect of nanotubes as compared to starting raw material anatas.Effects on the early hydration of C3S were investigated.Kinetic study showed accelerating effect of nanotubes on hydration process especially shortening of induction period and higher rate of hydration.Scanning electron microscope results shows the formation of C-S-H phases on the surfaces of nanotubes with C3S as model system.Titanate nanotubes improve the microstructure of cement system and denser micro structures lead to better mechanical properties.
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