铁道技术标准(中英文)

粉煤灰是混凝土的关键掺合料，其质量直接影响工程结构安全与耐久性。沪渝蓉高速铁路（沪宁段）作为重大交通工程，对混凝土质量要求严苛，新进场粉煤灰质量管控至关重要。本文以不同电厂合格粉煤灰与伪粉煤灰为研究对象，检测其玻璃微珠含量及性能指标，并通过混凝土配合比试拌，分析真伪粉煤灰对混凝土工作性、强度及耐久性的影响。结果表明，伪粉煤灰因无玻璃微珠滚动效应，显著劣化混凝土和易性、降低力学强度，且损害耐久性。结论认为，工程建设中需强化粉煤灰质量鉴别，建立严格管控机制，杜绝伪粉煤灰掺入，保障工程结构质量与长期稳定运营。

Fly ash is a key admixture in concrete, and its quality directly affects the structural safety and durability of engineering projects. As a major transportation project, the Shanghai-Nanjing section of the Shanghai-ChongqingChengdu High-speed Railway imposes stringent requirements on concrete quality, making the quality control of newly supplied fly ash critically important. This study takes the qualified fly ash from different power plants and pseudo fly ash as the research objects, and tested their glass microbead content and performance indicators. Through concrete mix proportion trials, the effects of genuine and pseudo fly ash on concrete workability, strength, and durability are analyzed. The results show that pseudo fly ash, due to the absence of the spherical effect from glass microbeads, significantly degrades concrete workability, reduces mechanical strength, and impairs durability. It is concluded that quality identification of fly ash needs to be strengthened in engineering construction, and strict control mechanisms should be established to prevent the incorporation of pseudo fly ash, thereby ensuring the quality of engineering structures and their long-term stable operation.