Resistance of Cement-based Grouting Materials with Nano-SiO₂ Emulsion to Chloride Ion Penetration

Abstract

The chloride penetration resistance of cement-based grout materials was improved by nano-silica emulsion. Specimens of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride solutions of specific concentrations with different test ages. Hardened properties of the mixes were assessed in terms of weight loss and compressive strength. X-ray diffraction (XRD) and scanning electron microscopy (SEM) of mixes were performed to analysis the phase evolution and microstructure. The results demonstrated that the introduction of nano-SiO₂ emulsion significantly decreased the compressive strength loss and calcium hydroxide (CH) crystal content of hydration production, and then enhanced the resistance of cement-based grouting materials to chloride ion penetration. This improvement derives from the filling and pozzolanic effects of nano-SiO₂ particles, which were incorporated via an emulsion and attributed to a well dispersion in grouting matrix.

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature