Investigation of Factors Influencing the Compressive Strength of Magnesium Phosphate Cement Mortars
Magnesium phosphate cement,recognized for its environmental sustainability,boasts attributes such as rapid setting,high early strength,low shrinkage,exceptional bond performance,robust corrosion resistance,and resilience against wear and freezing.These distinctive properties position it as a promising material for diverse applications in civil engineering.This study aims to explore the influence of various fac-tors,including phosphate type,fly ash content,water-to-binder ratio,and curing age,on the compressive strength of magnesium phosphate cement mortar(MPCM).Experimental findings revealed that in the ab-sence of fly ash,the utilization of a 1∶1 mass ratio blend of two phosphate salts led to a notable enhance-ment in the early compressive strength of MPCM compared to the individual application of either ammonium dihydrogen phosphate or potassium dihydrogen phosphate.Moreover,the addition of 20％fly ash by mass of cementitious material enhanced the 1-day compressive strength of MPCM formulated with potassium di-hydrogen phosphate or a combination of phosphate salts,although it might potentially compromise the strength at 28 days.Generally,the reduction in the water-to-binder ratio from 0.25 to 0.20 and the exten-sion of curing age from 1 day to 28 days exhibited favorable impacts on the compressive strength of MPCM.
magnesium phosphate cement mortarcompressive strengthphosphate typefly ash contentwater-cement ratio
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