Carbonation Resistance of Surface Protective Materials Modified with Hybrid NanoSiO2

To date, reinforcement concrete is the main construction material worldwide. As concentration of atmospheric CO2 steadily increasing, carbonation becomes a pressing concern. In this study, novel surface protective materials (SPMs) modified with hybrid nanoSiO2 (HNS), fly ash, and slag were developed to reduce emissions extend service life concrete. The depths measured by phenolphthalein reflect resistance. X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) conducted analyze chemical components samples after carbonation. addition, MIP was carried out examine microstructures prior Thermodynamic modeling employed calculate changes in phase assemblages each blends an ideal situation. experimental results showed that depth CaCO3 content SPM HNS decreased 79.0% 64.6% compared reference, respectively. TGA carbonation, contents 4.40% 12.42% reference samples, demonstrated incorporation led 48.3% 58.5% decrease big pores capillary pores, Overall, SPMs study possessed better resistance refined pore structures.