Study on the ratio and early performance of magnesium phosphate cement based on orthogonal test
Based on the orthogonal test method,the effects of M/P,water-binder ratio,fly ash content and micro-carbon fer-rochrome powder slag content on the fluidity,1 d and 3 d compressive strength of magnesium phosphate cement(MPC)were ara-lyzed.The optimum mix ratio of MPC was obtained,and the composition and microstructure of MPC were studied.The results show that the optimal mix ratio of MPC with mineral admixtures is M/P=8,water-binder ratio 0.18,fly ash content 25％,and micro-car-bon ferrochrome powder slag content 10％.The water-binder ratio is an important factor affecting the fluidity,and M/P is an im-portant factor affecting the compressive strength.The main phase composition of MPC mixed with fly ash and micro-carbon fer-rochrome slag is unreacted MgO and MgKPO4·6H2O.The addition of mineral admixtures can effectively densify the internal struc-ture of MPC matrix and improve its early strength.
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