【摘要】 随着对低碳建材和高性能混凝土需求的提升，系统评估振动搅拌对粉煤灰混凝土结构致密性、耐久性及全生命周期碳排放的影响，对推动绿色施工与节能减排具有重要意义。本研究系统探究了振动搅拌工艺对粉煤灰混凝土宏观力学性能、抗冻性、微观结构及碳排放的影响，采用了五种不同粉煤灰掺量的混凝土配合比，对比分析了振动搅拌与常规搅拌工艺的效果。通过抗压强度试验、快速冻融循环试验、核磁共振（NMR）、热重分析（TG/DTG）、扫描电子显微镜（SEM）及显微硬度测试表征混凝土性能，并应用生命周期评价（LCA）量化二氧化碳排放。结果表明：与常规搅拌相比，振动搅拌显著提升了粉煤灰混凝土的抗压强度与抗冻性，振动搅拌工艺使混凝土孔隙率降低了3.46%，有效促进了水泥水化与粉煤灰的火山灰反应，并优化了界面过渡区结构，表现为更高的显微硬度和更致密的交界面。LCA结果显示，在保持或提升混凝土性能的前提下，振动搅拌工艺可减少粉煤灰混凝土生产过程中的二氧化碳排放14～20 kg/m~3。更多还原

【Abstract】 With the increasing demand for low-carbon and high-performance concrete, evaluating the effect of vibration mixing on the microstructure, durability, and life-cycle carbon emissions of fly ash concrete is essential for advancing green construction technologies and emission-reduction strategies. In this study, the effect of vibration mixing process on the mechanical properties, frost resistance enhancement, microstructure and carbon emission of fly ash concrete was systematically investigated. The vibration mixing method was compared with the conventional mixing method through preparing concrete specimens under five mix proportions with different fly ash content. The macroscopic properties were evaluated according to the results of compressive tests and rapid freeze-thaw cycle tests. The characteristics of porosity, hydration degree and interfacial transition zone(ITZ) were characterized by nuclear magnetic resonance(NMR), thermogravimetric analysis(TG/DTG), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS) and microhardness test, respectively. Besides, life cycle assessment(LCA) was applied to quantify carbon dioxide emissions. The results indicate that compared with the conventional mixing method, the vibration mixing method significantly improves the compressive strength and frost resistance of fly ash concrete. The porosity of fly ash concrete decreases by 3. 46% under the vibration mixing method, in which the hydration process of the cement and the pozzolanic reaction of the fly ash are effectively promoted. And the ITZ is better optimized, which manifests as higher microhardness and a denser bonding interface. According to the LCA results, while maintaining or enhancing the properties of concrete, the vibration mixing method can reduce carbon dioxide emissions in the preparation process of fly ash concrete by 14～20 kg/m~3.更多还原