Magnesium oxysulfate cement is a high-performance magnesium-based cementitious material,characterized by its lightweight,high strength,and excellent fire resistance,among other properties.Therefore,it holds vast potential for a wide range of applications.By preparing cement pastes with different w/c and using a rheometer,the study investigates the effect of varying dosages of phosphoric acid on the rheological properties of magnesium oxysulfate cement paste.The experimental results revealed that adjusting the W/C could effectively regulate the increase in viscosity.The addition of phosphoric acid delayed the hydration of the cement paste,leading to a reduction in its plastic viscosity and yield stress.The Bingham model provided a good fit for the rheological curves of the cement paste both before and after the addition of phosphoric acid.
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