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Reuse of waste glass powder in alkali-activated metakaolin/fly ash pastes: Physical properties, reaction kinetics and microstructure
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.resconrec.2021.105721
Guangwei Liang , Haoxin Li , Huajun Zhu , Tiejun Liu , Qing Chen , Henghui Guo

To better understand the reaction of waste glass powder (WGP) as precursor in geopolymerization process, the leaching of main active ions (Ca2+, Al3+ and Si4+) from waste glass powder in alkaline solution was evaluated. The roles of replacement of metakaolin (MK) by WGP on the alkali-activated material (AAM) pastes were investigated by physical properties, reaction kinetics and microstructure. Experimental results show that the active ions are efficiently dissolved and leached in sodium hydroxide solution. With the incorporation of WGP, the workability of pastes is improved due to the physical and chemical characteristics of WGP particles. The mechanical performances including strengths and volume density are enhanced and obtained the highest values at the 20 wt% substitution level of MK by WGP. From the isothermal calorimetry (ICC), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) results, the geopolymerization process is accelerated and additional binder gels are formed. These are attributed to the reactive components (especially CaO) in WGP. The analyses of mercury intrusion porosimetry (MIP) and scanning electron microscope and energy dispersive spectrometer (SEM-EDS) indicate that the denser microstructure originated from the enrichment of gels and filling effect of raw materials particles is the significant support for the development of mechanical properties of AAM pastes.



中文翻译:

废玻璃粉在碱活化偏高岭土/粉煤灰糊中的再利用:物理性质、反应动力学和微观结构

为了更好地了解废玻璃粉 (WGP) 作为前驱体在地质聚合过程中的反应,主要活性离子(Ca 2+、Al 3+和 Si 4+) 从废玻璃粉在碱性溶液中得到的评价。通过物理性质、反应动力学和微观结构研究了用 WGP 替代偏高岭土 (MK) 对碱活化材料 (AAM) 糊剂的作用。实验结果表明,活性离子在氢氧化钠溶液中被有效地溶解和浸出。加入 WGP 后,由于 WGP 颗粒的物理和化学特性,浆料的可加工性得到改善。包括强度和体积密度在内的机械性能得到增强,并在 WGP 的 MK 20 wt% 替代水平下获得最高值。根据等温量热法 (ICC)、X 射线衍射 (XRD) 和热重分析 (TGA) 结果,地质聚合过程加速并形成了额外的粘合剂凝胶。这些归因于 WGP 中的反应性成分(尤其是 CaO)。压汞法(MIP)和扫描电子显微镜和能谱仪(SEM-EDS)的分析表明,源自凝胶的富集和原料颗粒的填充作用的更致密的微观结构是力学性能发展的重要支持AAM 糊状物。

更新日期:2021-06-18
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