Ji Xiangnan, Zhang Chen, Yang Yaru, Zhang Jiahao, Tang Lin, Ji Dongxu
Development Research Center for Natural Resources and Real Estate Assessment Shenzhen, Shenzhen 518000, China.
School of Maritime Law and Traffic Management, Guangzhou Maritime University, Guangzhou 510725, China.
Materials (Basel). 2025 Sep 4;18(17):4145. doi: 10.3390/ma18174145.
This study investigates the impact of particle size in fly ash derived from different coal sources on the performance of fly ash-cement systems. Utilizing a newly developed flotation classification method, physical properties of fly ash were examined to reveal variations among different particle sizes and coal sources. Thermal analysis was employed to analyze the calcium hydroxide content's effect on the cement system, while selective dissolution methods were used to assess reaction rates. XRD analysis confirmed particle size effects. Results indicate that flotation classification optimizes the properties of fly ash, enhancing activity and flow values, where some of the ash fractions exhibit overall superior properties. The use of high-volume fly ash (50% fly ash replacement) promotes continued pozzolanic reactions, especially with smaller particle sizes. Reaction rates decrease with larger particle sizes, emphasizing the importance of classification. XRD analysis further supports these findings, revealing that smaller particle sizes favor cement hydration and pozzolanic reactions. Overall, this study provides insights into optimizing fly ash properties for enhanced concrete performance.
本研究调查了不同煤源的粉煤灰中颗粒尺寸对粉煤灰-水泥体系性能的影响。利用新开发的浮选分级方法，对粉煤灰的物理性质进行了检测，以揭示不同颗粒尺寸和煤源之间的差异。采用热分析方法分析氢氧化钙含量对水泥体系的影响，同时使用选择性溶解方法评估反应速率。XRD分析证实了颗粒尺寸的影响。结果表明，浮选分级优化了粉煤灰的性能，提高了活性和流动值，其中一些粉煤灰级分表现出总体上更优异的性能。使用高掺量粉煤灰（50%粉煤灰替代率）促进了持续的火山灰反应，特别是对于较小颗粒尺寸的粉煤灰。反应速率随颗粒尺寸增大而降低，突出了分级的重要性。XRD分析进一步支持了这些发现，表明较小颗粒尺寸有利于水泥水化和火山灰反应。总体而言，本研究为优化粉煤灰性能以提高混凝土性能提供了见解。
