Although recycled aggregate concrete (RAC) has been extensively studied, several critical problems with its fundamental behaviors still urgently need to be figured out. Therefore, this series of two reviews re-thinks fundamental behaviors of RAC based on the latest literature. In the last review (part I), the mechanical and deformation behaviors of RAC were intensively discussed. Here in part II, the relationships between the replacement ratio of recycled aggregates (RA) and the durability of RAC are further presented. It is found that, owing to the increase of total porosity, the resistance of RAC to freeze–thaw cycles, carbonation, and chloride ion penetration is usually decreased with the increasing replacement ratio of RA. As a result, the steel corrosion and corrosion-induced cracking in RAC are more serious than those in natural aggregate concrete (NAC). The prediction models for carbonation and chloride ion penetration of RAC and the corrosion-induced crack patterns are also presented. To address the degradation on the performance of RAC, several enhancement technologies such as the combined/optimisation pre-treatment on RA and fiber reinforcement are put forward. Finally, the prospects of the high-performance/efficiency methodologies and applications of RAC are also shown.

中文翻译：

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再生骨料混凝土的基本行为 - 概述 II：耐久性和增强

尽管再生骨料混凝土 (RAC) 已被广泛研究，但其基本性能的几个关键问题仍亟待解决。因此，这一系列的两篇评论基于最新文献重新思考了 RAC 的基本行为。在上一篇综述（第一部分）中，对 RAC 的力学和变形行为进行了深入讨论。在第二部分中，进一步介绍了再生骨料替代率（RA）与 RAC 耐久性之间的关系。研究发现，由于总孔隙率的增加，RAC 对冻融循环、碳化和氯离子渗透的抵抗力通常随着 RA 置换率的增加而降低。因此，RAC中的钢筋腐蚀和腐蚀开裂比天然骨料混凝土（NAC）更严重。还介绍了 RAC 碳化和氯离子渗透的预测模型以及腐蚀引起的裂纹模式。为了解决RAC性能下降的问题，提出了RA和纤维增强的组合/优化预处理等几种增强技术。最后，还展示了 RAC 的高性能/效率方法和应用的前景。提出了RA联合/优化预处理、纤维增强等多种增强技术。最后，还展示了 RAC 的高性能/效率方法和应用的前景。提出了RA联合/优化预处理、纤维增强等多种增强技术。最后，还展示了 RAC 的高性能/效率方法和应用的前景。