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通过实验室球磨机制备出比表面积分别为280m2/kg、370m2/kg和670m2/kg的3种水泥熟料,与不同掺量的粉煤灰配制成不同颗粒级配的粉煤灰水泥,并测试了粉煤灰水泥浆体的抗压强度、自收缩、孔隙率和显微结构。结果表明:提高熟料细度能在很大程度上降低粉煤灰水泥浆体的孔隙率并提高复合水泥浆体早期抗压强度;粉煤灰的掺入降低了水泥体系的自收缩,提高了粉煤灰水泥浆体的体积稳定性;粉煤灰水泥浆体背散射图像表明,提高熟料细度可显著减少粉煤灰水泥浆体中未水化的水泥颗粒含量,并在一定程度上减少未水化粉煤灰颗粒含量。
Three kinds of cement clinker with specific surface area of 280m2 / kg, 370m2 / kg and 670m2 / kg were prepared by laboratory ball mill, and fly ash cement with different particle sizes was prepared and tested The compressive strength, self-shrinkage, porosity and microstructure of fly ash cement paste. The results show that increasing the fineness of clinker can greatly reduce the porosity of fly ash cement paste and increase the early compressive strength of the composite cement paste. The incorporation of fly ash reduces the self-shrinkage of cement system and increases The volume stability of fly ash cement paste; backscattering images of fly ash cement paste show that increasing the fineness of clinker can significantly reduce the content of unhydrated cement particles in fly ash cement paste, and to a certain extent Reduce the un-hydrated fly ash particle content.