Study on the Effect of Metakaolin on Properties of Magnesium Phosphate Cement
In order to study the effect of adding metakaolin into magnesium phosphate cement on the properties of magnesium phosphate cement,magnesium phosphate cement was modified by adding 5%,10%,15%and 20%(equal mass replacement of magnesium oxide)metakaolin into magnesium phosphate cement respectively.The effects of different amounts of metakaolin on the setting time,rheological param-eters,mechanical properties and volume stability of magnesium phosphate cement were studied.The results show that metakaolin in magnesium phosphate cement can prolong the setting time of magnesium phos-phate cement,reduce the fluidity of magnesium phosphate cement,improve the yield strength and viscosity of magnesium phosphate cement paste,and improve the mechanical properties and volume stability.As the content of metakaolin increases from 0%to 20%,the setting time of magnesium phosphate cement gradual-ly increases.Adding 20%metakaolin can extend the setting time of magnesium phosphate cement by 10 min.With the increase of metakaolin content,the fluidity of magnesium phosphate cement gradually decreases.When the content of metakaolin is less than 10%,the flexural strength and compressive strength of magne-sium phosphate cement increase with the increase of the content of metakaolin.When the content of metakaolin exceeds 10%,the mechanical properties of magnesium phosphate cement will be adversely affected.Metakaolin can significantly improve the volume stability of magnesium phosphate cement.
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