选择原材料是改善磷酸镁水泥性能的重要方法,为扩大磷酸镁水泥的应用范围,对 EVA 乳液改性磷酸镁水泥进行研究,结果表明,EVA 乳液的掺加对磷酸镁水泥的凝结时间与流动性影响小；磷酸镁水泥的抗压与抗折强度均随着 EVA 乳液掺量的增大,表现出先提高后降低的趋势,但存在不同的适宜掺量；EVA乳液显著增大磷酸镁水泥的粘结强度与断裂能；微观分析表明EVA乳液不改变磷酸镁水泥水化产物类型,但改变水化反应速度,影响水化产物形貌,其中MgNH4 PO4?6 H2 O 主要以柱状存在,并且结构更加致密。
Raw material selection was an essential and important way to improve the performance of magnesium phosphate cement (MPC).Using EVA emulsion to modify MPC to expand its application scope was investiga-ted.The results show that:(1 )the impact of EVA emulsion addition in MPC on its setting time and fluidity was insignificant;(2)with the increase of mixing amount of EVA emulsion,the compressive strength and the flexural strength of MPC both appear a trend of initial increase and subsequent decrease,but with different opti-mum dosage;and (3)addition of EVA emulsion can significantly increase MPC bond strength and fracture en-ergy.Further microscopic analysis indicates that addition of EVA emulsion does not change the types of hydra-tion products,but change the hydration rate and the morphology formation of hydrated products,e.g., MgNH4 PO4??6 H2 O mainly exists as columnar forms and with more condensed structure.
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