通过真空吸附法制备以改性钢渣微粉为壁材、石蜡为芯材的改性钢渣基相变微粉，表征了其孔结构、物质组成、相变温度与相变焓、粒度分布、表面形貌；以改性钢渣基相变微粉制备混凝土，分析了其流动性、粘聚性和保水性、力学性能和水化热性能. 结果表明，磷酸用量、石蜡用量和干燥箱内压强对相变微粉的石蜡吸入量有重要影响，当磷酸用量为6%(?)、石蜡用量为30%(?)、干燥箱内压强为0.04 MPa时，相变微粉具有良好的相变储能性能，相变温度为53.7℃，相变焓为12.20 J/g. 相变微粉混凝土不仅具有良好的流动性、粘聚性和保水性及早期强度高、后期强度稳定的力学性能，且可降低混凝土温度峰值、迟滞达到温峰的时间.

Modified steel slag-based phase change powders with modified steel slag shell and paraffin core were synthesized by vacuum adsorption. The pore structure, material composition, phase change temperature and phase change enthalpy, particle size distribution, surface morphology of modified steel slag-based phase change powder were characterized. And concrete of modified steel slag-based phase change powders with modified steel slag-based phase change powders were synthesized, the flow performance, cohesive performance and water resistance, mechanical properties, hydration heat performance were analyzing. The results showed that phosphate amount, paraffin amount and pressure in drying oven had great effects on the paraffin intake of modified powders. When phosphate amount 6%(?), paraffin amount 30%(?) and pressure in drying oven 0.04 MPa, modified steel slag-based phase change powder had good phase change energy storage performances, such as phase change temperature 53.7℃ and phase change enthalpy 12.20 J/g. Concrete of modified steel slag-based phase change powders not only had good flow performance, cohesive performance and water resistance, as well as mechanical properties of high early strength and post strength stability, but also had the characteristics of reduce the concrete temperature peak and hysteresis temperature peak to peak.