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世界城市地区的人口不断增加,按此趋势发展,到2025年世界城市人口将达到43亿。与此同时,城市生活垃圾也逐渐增加,到2025年,将从现在的13亿吨增加到22亿吨。在这些垃圾中,玻璃占5%,而且只有不到30%可循环利用,这意味着4 600万吨是填埋处理的。到2025年大约7 700万吨废弃玻璃需要进行填埋处理。尽管玻璃可以回收利用,但由于各方面原因使得玻璃的回收利用非常复杂,其中之一是因为需对玻璃进行颜色分类处理。目前,废玻璃已经用于替代部分硅酸盐水泥和骨料,但存在碱骨料反应的风险。废玻璃作为化学激发胶凝材料具有很大的潜力。但是关于该方面的研究很少,主要问题是将废玻璃作为碱激发胶凝材料使用时,其部分水化产物易溶于水。使用碱性激发剂激活其他含钙胶凝材料,如碳酸盐、矿粉等复合胶凝材料是可行的,且可得到性能优异的净浆和混凝土。讨论不同废玻璃水化反应产物的组成和结构,分析将废玻璃作为胶凝材料再利用在玻璃循环利用方面的可行性和优势。
With the increasing population in urban areas in the world and the trend of development, the world’s urban population will reach 4.3 billion by 2025. In the meantime, municipal solid waste has also been gradually increasing, from 2030, from 1.3 billion tons to 2.2 billion tons. Of these wastes, glass accounts for 5% and less than 30% is recyclable, which means that 46 million tonnes are landfilled. Approximately 77 million tons of waste glass will require landfilling by 2025. Although glass can be recycled, the recycling of glass is very complicated for various reasons, one of which is the need to color-classize the glass. At present, waste glass has been used to replace part of Portland cement and aggregate, but there is a risk of alkali aggregate reaction. Waste glass has great potential as a chemically activated cementitious material. However, few studies have been conducted on this aspect. The main problem is that when the waste glass is used as an alkali-activated cementitious material, some of the hydration products are easily soluble in water. The use of alkaline activators to activate other calcium-containing cementitious materials, such as carbonates, slag and other composite cementitious materials is feasible and can be obtained with excellent performance of the paste and concrete. The composition and structure of different waste glass hydration reaction products are discussed. The feasibility and advantage of reusing waste glass as recycling material in glass recycling are analyzed.