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Influence of metal impurity on recycled aggregate concrete and inspection method for aluminum impurity

机译：金属杂质对再生骨料混凝土的影响及铝杂质的检测方法

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摘要

Recycling construction demolition waste such as concrete rubbles has become more important for preventing resource depletion and reducing environmental burden. However, recycled aggregate from demolished concrete waste can bring about several problems due to the various impurities included in concrete waste, when recycled aggregates are used for recycled aggregate concrete. Therefore, it is significantly important not only to investigate the influence of impurities on properties of recycled aggregate concrete but also to examine the safety of recycled aggregate. The objective of this study is to investigate the properties of concrete containing two types of metal impurities, of which limit content is not specified in standards. To achieve this purpose, experimental works were conducted for concrete containing metal impurities with various size and content and it was found that aluminum, contained in recycled aggregate, caused performance degradation in both mechanical property and durability of recycled aggregate concrete even with very low content less than 0.1%. This paper also suggested a convenient inspection method for aluminum impurity utilized at plants to confirm the safety use of recycled aggregate and to reduce the risk of using recycled aggregate.
机译：回收建筑拆除废料（如混凝土瓦砾）对于防止资源枯竭和减轻环境负担变得更加重要。然而，当将再生骨料用于再生骨料混凝土时，由于混凝土废料中包含的各种杂质，来自拆除的混凝土废物的再生骨料会带来一些问题。因此，研究杂质对再生骨料混凝土性能的影响以及检验再生骨料的安全性具有重要意义。这项研究的目的是研究含有两种金属杂质的混凝土的性能，标准中未规定其极限含量。为了达到这个目的，对含有各种尺寸和含量的金属杂质的混凝土进行了实验工作，发现再生骨料中所含的铝即使含量很低也导致再生骨料混凝土的机械性能和耐久性的性能下降。超过0.1％。本文还提出了一种便利的工厂中铝杂质检查方法，以确认回收骨料的安全使用并降低使用回收骨料的风险。

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