Abstract
Concrete performance can be improved by using colloidal nano-SiO2 (NS) by two different methods: direct addition at the fresh stage to improve mechanical and durability properties; and superficial application, such as sealing treatment to hinder further penetration of aggressive ions. Chemical interaction of NS with the hardened cement mortar (HCM) was analyzed in both situations. NS chemical reactivity was confirmed by SEM and TGA tests. Mortar specimens with nanosilica additions (up to 2.5 % cement weight) were prepared and cured for 7 days before characterization. A superficial treatment by migration of colloidal NS dispersion (30 % weight concentration) under a 12 V was applied on mortar samples after 7 days of curing. Reactivity of NS with the HCM was confirmed by energy dispersion spectroscopy analysis (EDS) coupled to scanning electron microscopy in backscattering (SEM-BS). The new silicon enriched C-S-H gels with C/S ratio around 1.0 were determined by TGA.
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