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By selecting and compounding44different cementitious materials and chemical additives,two types of cement-based self-leveling floor mortar(SLM)with different binder systems were prepared.The effects of cementation system and U-type expansive agent on the properties of SLM were studied; the hydrated products of different binder systems and micro-structures of hardened pastes were investigated by X-ray diffractometry(XRD),scanning electron microscopy(SEM)and other characterization methods.