The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test

Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate

“…The resulting hydrate phases (C-S-H gels and aluminosilicates) would increase binding and reduce porosity in this region [32,48] thereby improving its micro-mechanical properties. This effect was shown by other authors [14,15] who pre-treated the recycled aggregate with additions such as fly ash or nanosilica.…”

“…Limited research published using nanoindentation to study ITZ nano-mechanical properties has mainly analysed the ITZ between recycled concrete aggregate and cement paste [2,[13][14][15]. To the best of our knowledge, no studies have been published in international journals on the micro-mechanical properties of the ITZs between the paste and each constituent (such as asphalt, brick, glass, wood or plastic) found in mixed recycled C&DW aggregate.…”

Stability analyses of submicron-boron mineral prepared by mechanical milling process in concrete roads

“…Nano silica has given better results at 3% and nano Cu-Zn ferrite and nano Ni ferrite have given better results at 2%, respectively [31]. In another study, mechanical properties of modified recycled aggregate concrete (MRAC) and its cracking resistance has been improved by the addition of nano-silica mortar [32]. Although there are studies about effects of nano silica materials on the concrete; this is the first study in literature both determined the submicron sized values of d 10 = 666 n and d min = 316 n for C-25 l and investigated the effectiveness of the contribution of boron mineral (colemanite) at this ratios and in these sizes in the concrete.…”

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.…”