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首页> 外文期刊>Magazine of Concrete Research >A review on the reactivation of hardened cement paste and treatment of recycled aggregates
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A review on the reactivation of hardened cement paste and treatment of recycled aggregates

机译：硬化水泥浆的再生及再生骨料的处理方法综述

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The generation of construction and demolition waste (CDW) worldwide keeps on escalating due to growth in infrastructure and the related refurbishment or replacement of existing structures. Numerous research studies on the utilisation of CDW materials in the production of new concrete have been conducted, from which it has been established that their use generally leads to inferior mechanical properties of the resulting concrete. As such, the general acceptance and conventional utilisation of CDW in the construction industry is undermined. The concept of a triple-layered interfacial transition zone is suggested to be the main reason for the inferior mechanical properties exhibited by recycled aggregate (RA) concrete. Past research on the reactivation of hydrated cement paste and on improving the quality of RAs by the use of different treatments, was reviewed. The review revealed that a combination of mechanical grinding and thermal treatment at temperatures of 500-800 degrees C is an effective means of activating the cementitious properties of hardened cement paste. Adhered mortar removal and mortar fortification are the main approaches for enhancing the properties of RAs. Mechanical abrasion and/or thermal treatment at a temperature of 500 degrees C, are the most effective techniques for improving the properties of RAs.
机译：由于基础设施的增长以及相关的对现有结构的翻新或更换，全球范围内的建筑和拆除废物（CDW）的数量不断增加。已经进行了许多关于在新混凝土生产中利用CDW材料的研究，从中可以确定，它们的使用通常会导致所得混凝土的机械性能较差。这样，破坏了CDW在建筑业中的普遍接受和常规利用。提出了三层界面过渡区的概念，这是再生骨料（RA）混凝土显示出较差的机械性能的主要原因。回顾了过去有关水合水泥浆再活化和通过使用不同处理方法改善RA的质量的研究。审查表明，在500-800摄氏度的温度下机械研磨和热处理相结合是激活硬化水泥浆胶凝特性的有效手段。去除砂浆和强化砂浆是增强RA性能的主要方法。在500摄氏度的温度下进行机械磨蚀和/或热处理是提高RA性能的最有效技术。

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