在磷酸、粉煤灰、硬脂酸钙单一改性研究的基础上，采取磷酸、粉煤灰、硬脂酸钙和磷酸、粉煤灰、苯丙乳液两种复合体系分别对氯氧镁水泥进行复合改性。结果表明，同时掺入1％磷酸、20％粉煤灰和1％硬脂钙或1％苯丙乳液均可有效提高5?1?8主晶相在水中的稳定性，提高材料的密实度和耐水性能，其中以磷酸、粉煤灰及苯丙乳液三者复合改性效果最佳；最优改性试样的3及7d强度分别高达634．，751．MPa，软化系数高达0．9，浸水7 d，泡水强度保持在681． M Pa ，较空白样提升了60．2％，复合改性效果显著。
On the basis of the research on the modification on magnesium oxychloride cement (MOC) with phos‐phoric acid ,fly ash and calcium stearate respectively ,then phosphoric acid ,fly ash and calcium stearate or phosphoric acid ,fly ash and styrene‐acrylic emulsion were adopted to improve the water resistance of MOC . The results show that ,while adding 1wt% phosphoric acid ,20wt% fly ash and 1wt% calcium stearate or 1wt% styrene‐acrylic emulsion to the cement ,the stability of 5 ?1?8 main phase in water ,the density and water resistance of the cement were improved effectively ,among them ,phosphoric acid ,fly ash and styrene‐acrylic emulsion as compound modifiers are the best .Compressive strength of optimal modified specimen cured 3 and 7 d could reach 63 4. ,75 1. MPa respectively .softening coefficient were up to 0 9. ,when soaked in water 7 d ,compressive strength still can maintain 68 1. MPa ,improving 60 2.% compared with the blank .Compound modification effect is remarkable .
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