Abstract
Nano-silica is used in various composite materials as a kind of filler with good performance. In this study, hydrogen peroxide was used to repair and activate the hydroxyl group on the surface of nano-silica, and chitosan phosphate ester was loaded onto the surface of nano-silica through intermolecular dehydration to prepare nano-silica@ chitosan phosphate ester, and nano-silica@ chitosan phosphate ester was added to the magnesium oxychloride cement for water resistance modification. The results showed that the addition of nano-silica@ chitosan phosphate ester increased the compressive strength of magnesium oxychloride cement at different ages, and the compressive strength of the modified magnesium oxychloride cement at 7 days and 28 days were 116 MPa and 127 MPa, respectively, which increased by 11.5% and 5.8% compared with the unmodified samples. The compressive strength of the modified magnesium oxychloride cement reached 102 MPa after 28 days of water immersion, which was 8.3% higher than that of the phosphoric acid modified sample under the same water immersion duration. At the same time, it was found that nano-silica@ chitosan phosphate ester can increase the fluidity of magnesium oxychloride cement slurry, accelerate the hydration reaction rate and refine the pores.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
