Abstract In recent years several studies analysed the influence of recycled aggregates obtained from concrete debris (Recycled Concrete Aggregates, RCAs) on the durability performance of structural concrete produced with them (Recycled Aggregate Concretes, RACs) and, within this, also the influence of high temperatures has been investigated. In most cases, the concrete strength has not been considered as a key control parameter for the comparison between RACs and ordinary concrete performance. In this context, starting from a fundamental characterization of the raw materials under high temperatures, this paper presents a comprehensive experimental study on normal- and high-strength RACs mixtures designed with the Compressible Packing Model, with the aim of investigating their residual mechanical and physical performance when subjected to high temperatures (up to 650 °C). This approach allows a generalized analysis by considering the overall amount of attached mortar (AM) that represents the key parameter characterizing RCAs. In fact, since one of the main issues related to the possible use of RCAs in concrete is their significant unknown heterogeneity depending on their original source, the identification of a fundamental parameter such as the AM, allows to extend the conclusion obtained herein for RAC mixtures produced with RCAs derived from different origins.

中文翻译：

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高温对普通和高强再生骨料混凝土力学和物理性能的影响

摘要 近年来，一些研究分析了从混凝土碎片中获得的再生骨料（再生混凝土骨料，RCAs）对用它们生产的结构混凝土（再生骨料混凝土，RACs）的耐久性性能的影响，在这方面，还分析了高温度进行了调查。在大多数情况下，混凝土强度并未被视为比较 RAC 与普通混凝土性能的关键控制参数。在此背景下，本文从原材料在高温下的基本特征开始，对使用可压缩填料模型设计的普通和高强度 RAC 混合物进行了全面的实验研究，目的是研究它们在高温（高达 650 °C）下的残余机械和物理性能。这种方法允许通过考虑代表 RCA 关键参数的附着砂浆 (AM) 总量进行广义分析。事实上，由于与在混凝土中可能使用 RCA 相关的主要问题之一是它们的显着未知异质性取决于它们的原始来源，因此对 AM 等基本参数的识别允许扩展本文针对 RAC 混合物获得的结论用来自不同来源的 RCA 产生。