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首页> 美国卫生研究院文献>Materials >Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure
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Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

机译：高温暴露后再生骨料混凝土的残余抗压强度

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摘要

Sustainability requirements are gaining importance in the construction industry, which needs to take specific measures in the design and construction of concrete structures. The use of recycled aggregates in concrete may be of special interest. Recycling a construction waste will close the life cycle of the original materials (e.g., concrete). Thus, environmental benefits would come from the lower waste generation, and from a lower necessity of raw materials for new structures. The current Spanish code for structural concrete considers the use of recycled aggregates in replacement rates up to 20% by aggregate mass, assimilating their properties with those of concretes without aggregate replacement. Higher substitution percentages would require further testing. In this work, substitution of coarse aggregate for recycled aggregates (with replacement percentages of 25%, 50% and 100%) has been studied, and the concrete’s residual properties after exposure to high temperatures (between 350 °C and 850 °C) have been assessed. Compressive strength and capillary water absorption tests were made after heating, and the experiments showed higher residual strength in concretes with the greatest content of recycled aggregates. However, a statistical analysis made with additional data available in the literature seemed to predict otherwise, and the recycled aggregate replacement would have a negative effect on the residual strength.
机译：可持续性要求在建筑行业中变得越来越重要，该行业需要在混凝土结构的设计和施工中采取特定措施。在混凝土中使用再生骨料可能会引起特别关注。回收建筑废料将关闭原始材料（例如混凝土）的生命周期。因此，减少废物产生和新结构所需原材料的减少将带来环境效益。西班牙现行的结构混凝土法规考虑使用再生骨料，其替代率最高为骨料质量的20％，将其性能与未经骨料替代的混凝土的性能相同。较高的取代百分比将需要进一步测试。在这项工作中，已经研究了用粗骨料代替再生骨料（替代百分比为25％，50％和100％），并且混凝土在暴露于高温（350°C和850°C之间）后的残余性能已经达到被评估。加热后进行抗压强度和毛细管吸水率测试，实验表明，在再生骨料含量最大的混凝土中，残余强度更高。但是，利用文献中提供的其他数据进行的统计分析似乎预示着其他情况，而回收的骨料替代品将对残余强度产生负面影响。

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