Properties of concrete incorporating nano-silica

Structure Analysis of Fe3O4@SiO2 Core Shells Prepared from Amorphous and Crystalline SiO2 Particles

“…Therefore, it indicates that the Fe3O4 particles can succeed to form a core formation shell with SiO2 as a layer [1,18,40,41].The stretching and bending vibration of the H-O-H bond are found at wave numbers of 1641-3465 cm -1 . Such functional groups have almost similar characteristics with the Fe3O4@a-SiO2 particles obtained from the references [27], [28]. Figure 3b.…”

“…Typically, the SiO2 nanoparticle has an amorphous phase, and it can be commercially produced as silica gel, fume-silica, and so forth. Several applications of SiO2 nanoparticles for examples such as medical purposes [22][23][24], as additives for rubber and plastics [25][26][27], as fillers for composite construction concrete [28][29][30], as stabilizers and agents drug delivery and theranostics [23,31], and as a heavy metal absorbent material in a water filter [14], [22].…”

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

“…For instance, compared to the control specimens without Ns (C-S and CG-BP) and irrespective of the type of fibers included, the compressive strength of the NFRM increased by up to 168% and 108% at three days for mixtures without and with slag, respectively. These results are consistent with the effect of nano-silica on cementitious systems, which effectively contributes to the strength development of cement-based materials through multiple mechanisms, including accelerated pozzolanic activity [15][16][17][18][19][20][21][22], filler effect [20,21], and water absorption into the high surface area of silica particles/agglomerates (i.e., reduction of w/b in the paste) [21]. In addition, the results of the NFRM at 28 and 56 days indicated that there was continuous and significant improvement in strength beyond seven days in comparison to the fiber reinforced mortars without nano-silica, especially for mixtures containing slag.…”

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

“…ese nanoparticles can result in a dense ITZ through two mechanisms: one is physical and the other one is chemical. e latter is attributed to the chemical ability of the SiO 2 nanoparticles to react with the Ca(OH) 2 (one of the cement hydration products) and leading to the formation of more gel product, calcium silicate hydroxide (C-S-H), which is the product responsible of the strength of the concrete and dense microstructure of the ITZ in concrete [23,39,40]. e former can be due to large surface area and the super-ultrafine size of the nanoparticles.…”

“…e former can be due to large surface area and the super-ultrafine size of the nanoparticles. is small size of these particles helps in filling up all the micropores/nanopores and voids exit in the attached mortar and the ITZ resulting in a more densified microstructure of the cement matrix [34,38,40]. Hence, these two mechanisms seem to be the main reasons behind the improvement of the strength of the RAC containing nanoparticles of SiO 2 .…”