研究了m(M)/m(P)比值对磷酸镁水泥干燥收缩行为的影响，采用温度记录仪、压汞仪、X 射线衍射仪、扫描电镜及能谱仪等分析手段探讨了m(M)/m(P)比值对磷酸镁水泥干燥收缩的作用机理。结果表明，随着m(M)/m(P)比值的增大，磷酸镁水泥水化初期的膨胀量以及干燥收缩减小；水化8 h左右水泥开始收缩，龄期达到20 d左右收缩趋于稳定；磷酸镁水泥收缩量的减少，是由于m(M)/m(P)比值的增大导致磷酸镁水泥水化温度降低，孔隙率增大，水化产物MgKPO4?6 H2 O 减少，水化产物结构趋于疏松。
The effect of m(M)/m(P)ratio for the drying shrinkage and mechanism of magnesium phosphate ce-ment was investigated by temperature recorder,Mercury mercury analyzer,X-ray diffractometer,scanning e-lectron microscope and energy spectrometer.The results show that with the increase of m(M)/m(P)ratio,the expansion and drying shrinkage of magnesium phosphate cement decreases.The drying shrinkage of cement pro-duced about hydrate 8 hours later,and tends to be stable at the age of 20 days.The increase of m(M)/m(P)ra-tio which lends to the decrease of the hydration temperature,the increase of the porosity,the decrease of MgK-PO4?6 H2 O,and the looser structure of the hydration products will results in the decrease of drying shrinkage of magnesium phosphate cement.
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