Abstract
Magnesium oxysulfate (MOS) cement is a type of green inorganic cementitious material, with the advantages of light weight, low thermal conductivity, binding ability in light-weight panels, high temperature resistance and good fire resistance; however, its application range in practical engineering is limited by its low mechanical strength. In this paper, the influences of sodium citrate and citric acid as additives on the mechanical strength, water resistance, setting time, pH change, composition and microstructure of MOS cement were investigated. The sample properties were examined by means of mechanical strength test, Vicat apparatus, pH meter, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The results revealed that adding sodium citrate or citric acid could promote the large amount of 5 Mg(OH)2·MgSO4·7H2O generation and improve the water resistance of MOS cement. The incorporation of sodium citrate or citric acid caused a reduction in the total porosity and the volume fraction of large pores (>100 nm) in MOS cement, as well as an increase in the most probable aperture and the volume fraction of small capillary pores (10 nm–100 nm). In addition, the setting time of MOS cement with sodium citrate or citric acid was longer than that without sodium citrate or citric acid.
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.
