Aiming at the integrated requirements of building energy saving and thermal insulation reinforcement in reinforcement engineering, the technology of preparing multi-functional high-ductility engineered magnesium oxysulfate cement-based composites (MOSC-ECC) by magnesium oxysulfate cement (MOSC) was proposed; the mechanism of industrial waste fly ash (FA) to improve the ductility of MOSC-ECC was explored; the effects of FA on the density, thermal conductivity and water resistance of MOSC-ECC were studied; the phase composition and microstructure of the hydration products of MOSC-ECC were analyzed. The results show that the incorporation of FA instead of light-burned magnesium oxide (LB-MgO) powder of equal mass can effectively reduce the cracking strength, fracture toughness, density and thermal conductivity of the matrix, and improve the ductility and multiple cracking ability of MOSC-ECC. The incorporation of hydrophobic agent made MOSC-ECC have excellent water resistance. The findings of this study provide useful knowledge for realizing the integrated design of thermal insulation and reinforcement of structures, which is of great significance for promoting the engineering application of ECC and the promotion of energy-saving green building materials.

针对加固工程中建筑节能与保温加固的综合要求，提出了用硫氧镁水泥（MOSC）制备多功能高延性工程化硫氧镁水泥基复合材料（MOSC-ECC）的技术；探讨了工业废粉煤灰（FA）提高MOSC-ECC延展性的机理；研究了FA对MOSC-ECC密度、导热系数和耐水性的影响；分析了MOSC-ECC水化产物的相组成和微观结构。结果表明,掺入FA代替等质量的轻烧氧化镁(LB-MgO)粉可有效降低基体的开裂强度、断裂韧性、密度和导热系数,提高塑性和多次开裂能力。 MOSC-ECC。疏水剂的加入使MOSC-ECC具有优异的耐水性。本研究结果为实现结构保温与加固一体化设计提供了有益的知识，对于推动ECC的工程应用和推广节能绿色建筑材料具有重要意义。