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Effect of Fly Ash with Different Particle Size Distributions on the Properties and Microstructure of Concrete
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-15 , DOI: 10.1007/s11665-020-05108-x
Yunpeng Cui , Jun Liu , Licheng Wang , Runqing Liu , Bo Pang

Fly ash has become an important component of concrete as a supplementary cementitious material. Fly ash, as an admixture in concrete, has a great impact on the improvement of concrete properties and utilization of resources. In this work, fly ashes with different particle size distributions (S. Tsivilis, Andersen, normal and F distributions) were selected to prepare concrete. The relationships among the particle size distribution of the fly ash, compressive strength, hydration, pore structure and microstructure of the concrete were studied. The results showed that the compressive strength of the concrete increased at 28 d with fly ashes with the S. Tsivilis and F distributions. Moreover, the porosity of the concrete at 28 d was reduced, and the pore structure of the concrete was improved. The early compressive strength of the concrete increased with the fly ash with a normal distribution. The second hydration heat release rate of the concrete with fly ashes with a normal distribution and an F distribution was obviously faster. In addition to the Andersen distribution, other distributions of fly ash had obvious improvement effects on the pore structure of the concretes. High-performance concrete can be made from fly ash with different particle sizes, which avoids the need for ultrafine grinding with a high energy consumption and high-cost chemical excitation processes.



中文翻译:

不同粒径分布的粉煤灰对混凝土性能和微观结构的影响

粉煤灰已经成为混凝土的重要组成部分,作为一种辅助胶凝材料。粉煤灰作为混凝土的外加剂,对改善混凝土性能和资源利用具有重大影响。在这项工作中,选择了具有不同粒径分布(S. Tsivilis,Andersen,正态分布和F分布)的粉煤灰来制备混凝土。研究了粉煤灰的粒径分布,混凝土的抗压强度,水化,孔隙结构和微观结构之间的关系。结果表明,随着飞灰的出现,混凝土的抗压强度在28 d时随S. Tsivilis和F分布的增加而增加。此外,降低了28 d时混凝土的孔隙率,改善了混凝土的孔结构。粉煤灰以正态分布增加了混凝土的早期抗压强度。具有正态分布和F分布的粉煤灰混凝土的第二水化放热速率明显更快。除Andersen分布外,粉煤灰的其他分布对混凝土的孔结构也有明显的改善作用。高性能混凝土可以由不同粒径的粉煤灰制成,从而避免了需要高能耗和高成本化学激发过程的超细粉碎。粉煤灰的其他分布对混凝土的孔隙结构有明显的改善作用。高性能混凝土可以由不同粒径的粉煤灰制成,从而避免了需要高能耗和高成本化学激发过程的超细粉碎。粉煤灰的其他分布对混凝土的孔隙结构有明显的改善作用。高性能混凝土可以由不同粒径的粉煤灰制成,从而避免了需要高能耗和高成本化学激发过程的超细粉碎。

更新日期:2020-09-16
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