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城市废玻璃作为水泥基材料在化学激发胶凝材料中的潜在应用

DOI: 10.14062/j.issn.0454-5648.2015.10.14

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Abstract:

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4600万吨是填埋处理的。到2025年大约7700万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。

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