关键词: 氯氧镁水泥;力学性能;养护方式;水分传输

Abstract: Six different curing regimes were set up through controlling the transport process of moisture. The influence of different curing regimes on mechanical properties of magnesium oxychloride cement was studied.X-ray diffraction, pore parameters method and scanning electron microscopy were adopted to analysis the effect of different curing regimes on the MOC phase composition, microstructure and morphology.The results show that the main phase of MOC cement does not change under different curing regimes;poor mechanical properties appeared when adopting the open form of curing;however,samples could get a better densification and higher mechanical properties arose under the condition of the seal curing.As for microcosmic morphology,under the open form of conservation,the length of the crystal lap grows,the structure is loose; in the form of sealed microstructure is dense intertwined short rod-like crystals exist,being dense structure.Especially in the M5 curing, crystalline hydrates trend to the gel-like crystalline transformation.Its mechanism can be explained that H 2O molecules could participate in the formation of 518 crystal abundantly under the seal curing condition,this lead to a higher mechanical performance of MOC.

Key words: magnesium oxychloride cement;mechanical property;curing regimes;moisture transport