Abstract
• Borax effect on the hydration of magnesium phosphate cements was studied. • The setting was investigated with Gillmore tests, calorimetry, Raman and pH analyses. • Set cements were studied with XRD, SEM, mechanical tests and Solid State NMR. • Borax prolongs the setting time and reduces the heat released during setting. • Retarding action is due to the interaction between borates and Mg 2+ and NH 4 + . This work unravels for the first time the concentration dependent retarding effect of borax on tri-magnesium phosphate-based cements by studying the hydration and the phases formed in the set cements, exploiting multiple characterization techniques. In the presence of borax, the hydration was found to be slower and less exothermic, leading to the formation of struvite without newberyite, with no effect on cement’s strength. The observed boron species allowed us to ascribe the retardation to the complexation of NH 4 + and Mg 2+ by borate and polyborate anions.
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.
