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Sustainable enhancement of fly ash-based geopolymers: Impact of Alkali thermal activation and particle size on green production
Process Safety and Environmental Protection ( IF 6.9 ) Pub Date : 2024-09-02 , DOI: 10.1016/j.psep.2024.08.133
Xianqing Xu , Shenxu Bao , Yimin Zhang , Yang Ping

Addressing the challenges posed by the slow reactivity of fly ash (FA) with alkali at ambient temperatures, this study delves into the enhancement of FA-based geopolymers through alkali thermal activation (ATA). The ATA process, conducted at 550°C for 1 h, significantly increases the availability of reactive silica and alumina, which are essential for geopolymerization. A critical focus of the research is the influence of FA particle size on ATA’s efficacy and the resultant mechanical properties of the geopolymers. Findings reveal that the ATA process facilitates the rapid dissolution of the vitreous phase in FA. This leads to a sequential release of silica and alumina, which is pivotal for the geopolymer’s matrix development. Notably, geopolymers synthesized from finely milled FA, post-ATA, demonstrate a marked increase in compressive strength, escalating from 30.51 MPa to an impressive 38.46 MPa. The study meticulously delineates geopolymerization into four distinct stages—initial dissolution, depolymerization, geopolycondensation and gelation, and final diffusion, with the initial dissolution and final diffusion stages being paramount in defining the reaction kinetics and the ultimate strength of the geopolymer. This enhanced understanding paves the way for optimizing FA utilization in geopolymers, promising a more sustainable and efficient pathway for producing construction materials with superior mechanical properties.

中文翻译:


粉煤灰基地聚合物的可持续增强:碱热活化和粒径对绿色生产的影响



为了解决粉煤灰 (FA) 在环境温度下与碱的缓慢反应性所带来的挑战,本研究深入探讨了通过碱热活化 (ATA) 增强 FA 基地聚合物。ATA 工艺在 550°C 下进行 1 小时,显著提高了活性二氧化硅和氧化铝的可用性,这对地聚合至关重要。该研究的一个关键重点是 FA 粒度对 ATA 功效和由此产生的地质聚合物机械性能的影响。研究结果表明,ATA 过程促进了 FA 中玻璃体相的快速溶解。这导致二氧化硅和氧化铝的连续释放,这对地质聚合物的基体发育至关重要。值得注意的是,在 ATA 之后,由精细研磨的 FA 合成的地质聚合物的抗压强度显着增加,从 30.51 MPa 上升到令人印象深刻的 38.46 MPa。该研究将地聚分为四个不同的阶段——初始溶解、解聚、土聚缩聚和凝胶化以及最终扩散,其中初始溶解和最终扩散阶段对于定义地聚合物的反应动力学和最终强度至关重要。这种更深入的理解为优化 FA 在地质聚合物中的利用铺平了道路,为生产具有卓越机械性能的建筑材料提供了更可持续和高效的途径。
更新日期:2024-09-02
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