Dispersion characteristics of various contents of nano‐TiO₂ and its effect on the properties of cement‐based composite

Abstract

Effect of nano‐TiO2 on the compressive strength and permeability of cement paste was studied, and the mechanism was revealed through investigating the hydration evolution and hydration products distribution of cement containing various contents of nano‐TiO2. Hydration Heat of cement, microstructure and pore structure of cement paste indicated that nano‐TiO2 could act as “nuclear” to accelerate the cement hydration, and this acceleration effect strengthened upon the nano‐TiO2 content at early age while reversed at long age. Distribution uniformity of nano‐TiO2 and hydration products was characterized and quantitative evaluated based on the method of energy dispersive X‐ray spectroscopy, which showed that the dispersion of nano‐TiO2 and hydration products had a high relativity, and the most uniform distribution was achieved at a small content of nano‐TiO2. The main effect of nano‐TiO2 on the properties of cement paste at early age and long age was the accelerated hydration and the improved distribution uniformity, respectively.

Experimental studies on rheological, mechanical, and microstructure properties of self‐compacting concrete containing perovskite nanomaterial

“…cement [24][25][26][27][28] production are widely reported, and may indeed lead to a new generation of high-performance concrete material for sustainable construction.…”

Implications of Nano-Titanium Dioxide Incorporation in Cement Matrix: A Review

“…n-TiO 2 takes the advantage of its size to organize themselves in a close-packing dense arrangement thereby filling the voids and reducing the porosity and permeability [18]. Liu et al [19] observed the n-TiO 2 concrete microstructure and reported the optimum conditions for the dispersion of n-TiO 2 . Behfarnia et al [20] reported n-TiO 2 replacement up to 4% showing optimum dispersion and improving the pore structure of the concrete.…”

“…1% replacement showed best performance with respect to durability and increase in n-TiO 2 increased the amount of water absorption in the presence of fly ash. Liu et al [19] studied the effect of n-TiO 2 (0.5, 1 and 3% replacement) on the compressive strength and permeability of the cement paste. Compression test showed that replacement of cement by 1% by weight increased the strength when compared to the control mix.…”

“…Mohseni et al [27] observed the durability of concrete with water absorption test where increase in n-TiO 2 content increased the amount of water absorption while 1% n-TiO 2 replacement decreased the same. Liu et al [19] studied the durability effect in terms of chloride diffusion test where out of the three samples tested (n-TiO 2 replacement by 0.5%, 1%, and 3%), 1% replacement absorbed less chloride. A 40-65% reduction in water absorption was achieved upon 3% n-TiO 2 incorporation along with significant enhancement of gas erosion resistance of mortars [29].…”

Effects of GO/Al2O3 and Al2O3 Nanoparticles on Concrete Durability against High Temperature, Freeze‐Thaw Cycles, and Acidic Environments

“…Many researchers have combined the properties of concrete with nanomaterials [3,4]. Recent results have shown that the addition of nanoparticles, including nano-SiO 2 , nano-ZrO 2 , nano-Fe 3 O 4 , nano-TiO 2 , and nano-Al 2 O 3 , can lead to the reconstitution of the pore structure of concrete and effectively improve its mechanical properties and durability [5][6][7][8]. Nano-SiO2 added at the specified concentration not only increases the strength of the concrete but also acts as a cement replacement material [9].…”