【摘要】 研究了3种聚醚类消泡剂及其掺量对超高性能混凝土（UHPC）扩展度、抗压强度和消泡效果的影响，采用图像处理分析技术研究了消泡剂对UHPC气泡总量、气泡间距系数及孔径分布的影响。结果表明，掺入适量消泡剂能提高了UHPC的流动性和抗压强度，减少含气量并优化气孔分布；但过量掺入则会降低UHPC的流动度和抗压强度。掺入消泡剂能明显改善UHPC基体中的气泡情况，消泡剂XP-Y15、XP-Y19、XP-Y20的最优掺量分别为0.20%、0.20%、0.15%，且掺入0.20%XP-Y15时具有最佳的消泡抑泡效果，与UHPC的适配性较好。更多还原

【Abstract】 This study systematically investigates the effects of three different types of defoaming agents and their dosages on the expansion degree,compressive strength and defoaming effect of ultra-high-performance concrete(UHPC). Image processing and analysis techniques were employed to further explore the regulation of defoaming agents on the total bubble content,bubble spacing coefficient,and pore size distribution in UHPC. The results reveal that within an appropriate dosage range,the introduction of defoaming agents significantly enhances the fluidity and compressive strength of UHPC,while effectively reducing the air content and optimizing the pore distribution. However,when the dosage of defoaming agents exceeds a certain threshold,both the fluidity and compressive strength of UHPC exhibit a declining trend. The addition of defoaming agents can significantly improve the bubble situation in UHPC matrix. The optimal dosages of defoamers XP-Y15,XP-Y19,and XP-Y20 are 0.20%,0.20%,and 0.15%,respectively,and the addition of 0.20% XP-Y15 exhibits the best defoaming and foam suppression effect,with good compatibility with UHPC.更多还原