Samarakoon M H, Ranjith P G, Hui Duan Wen, Haque Asadul, Chen Bernard K
Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia.
Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia.
Waste Manag. 2021 Jul 1;130:1-11. doi: 10.1016/j.wasman.2021.04.060. Epub 2021 May 24.
The feasibility of the extensive recycling of waste glass in alkali-activated materials (AAMs) was evaluated. The waste glass was utilised in AAMs for two purposes: a partial activator and a mineral precursor. The waste glass was blended with commercial sodium hydroxide and then heated to produce the solid activator powder. The technical performance of waste glass-based activator was investigated to replace commercial sodium silicate, a common alkali-activator used in AAMs. The effect of waste glass using only as the activator (WGA) and using as both activator and precursor (WGAP) in fly ash/slag-based one-part AAMs was studied using strength and microstructure characterisations. A mass-cost and emission analysis of waste glass-based AAMs (WGA and WGAP) was conducted, comparing the results with ordinary Portland cement (OPC). Characterisation tests of waste glass-based activator showed the effective formation of sodium silicate minerals with the adequate dissolution of activator in water by releasing reactive alkali and silica. Both WGA and WGAP showed comparable strengths at 56 days with a denser microstructure under ambient curing. According to mass analysis, waste glass could be utilised up to 17% by mass of total binder. Based on the analysis of cost and CO emissions, WGA and WGAP are around 23% and 15% cheaper and 84% and 82% greener than OPC. The dual role of waste glass in AAMs as an activator and as a precursor broadens the recycling of glass waste in the cement industry by favouring technical and environmental outcomes.
评估了在碱激发材料（AAMs）中大量回收废玻璃的可行性。废玻璃在AAMs中有两个用途：部分活化剂和矿物前驱体。将废玻璃与商业氢氧化钠混合，然后加热以生产固体活化剂粉末。研究了废玻璃基活化剂替代AAMs中常用的碱活化剂——商业硅酸钠的技术性能。通过强度和微观结构表征，研究了废玻璃仅用作活化剂（WGA）以及在粉煤灰/矿渣基单组分AAMs中既用作活化剂又用作前驱体（WGAP）的效果。对废玻璃基AAMs（WGA和WGAP）进行了质量成本和排放分析，并将结果与普通硅酸盐水泥（OPC）进行比较。废玻璃基活化剂的表征测试表明，通过释放活性碱和二氧化硅，有效形成了硅酸钠矿物，且活化剂在水中有足够的溶解性。在环境养护条件下，WGA和WGAP在56天时均表现出相当的强度，微观结构更致密。根据质量分析，废玻璃的用量可达总胶凝材料质量的17%。基于成本和二氧化碳排放分析，WGA和WGAP比OPC便宜约23%和15%，环保程度高84%和82%。废玻璃在AAMs中作为活化剂和前驱体的双重作用，通过促进技术和环境效益，拓宽了水泥行业中玻璃废料的回收利用。
