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Materials Chemistry and Physics, Vol.235, 2019
Preparation and characteristics of porous magnesium phosphate cement modified by diatomite
According to reports, the porous magnesium phosphate materials had the disadvantage of short setting time which led to incomplete reaction with low strength and low porosity. In order to solve the problem of short reaction time and the relationship between strength and porosity, diatomite was added into this system. Diatomite/magnesium phosphate porous composite material (DM-MPPCM) was prepared by the pre-foaming method. The results revealed that the addition of DM prolonged the setting time and improved the strength. The effects of different vesicant/water (V/W) ratios, diatomite/phosphate (DM/P) ratios and water/solid (W/SO) ratios on the mechanical properties and porosity of DM-MPPCM were investigated. The DM-MPPCM with an average pore size of about 75 mu m showed porosity of 90.70%, compressive strength of 1.104 MPa and suitable bulk density of 620 kg/m(3) under the V/W ratio of 0.1, DM/P ratio of 1.5 and W/SO ratio of 0.6. Moreover, the observations and characterization results showed that addition of DM promoted the hydrogenation reaction, and DM as a filler was uniformly dispersed in the frame structure to improve the strength and porosity of DM-MPPCM.