The research presented in this article analysed the influence of incorporating precast concrete waste as an alternative to coarse aggregate in self-compacting concrete to generate new precast elements. The experimental study involved the characterization of recycled aggregate and the design of the mix of the new self-compacting concrete (SCC). The experimental study evaluates the physical processes that affect the durability of concrete with percentages of incorporation such as 20%, 50% and 100% of recycled aggregate. Two types of SCC were manufactured with minimum compressive strength of 30 MPa and 45 MPa. The properties analysed were density of hardened SCC, shrinkage cracking, freeze-thaw resistance, resistance to ageing by thermal shock and abrasion resistance. The results obtained were compared with those of the control concrete, observing great capacity of the SCC under physical aggressions that affect durability. The results of this research show that it is possible to use the recycled aggregate coming from precast pieces in order to the manufacture of self-compacting recycled concrete in the same precast industry. However, high loss of proprieties occurs for a 100% substitution, while for 20% and 50%, the variations with respect to control concrete are smaller. In addition, taking advantage of this waste to incorporate it back into the production chain contributes to more sustainable construction.

中文翻译：

---

再生预制混凝土骨料对混凝土物理过程耐久性的影响

本文介绍的研究分析了将预制混凝土废料作为自密实混凝土中粗骨料的替代物产生新的预制构件的影响。实验研究涉及再生骨料的表征和新型自密实混凝土（SCC）的配合比设计。实验研究通过掺入百分比（例如再生骨料的20％，50％和100％）评估了影响混凝土耐久性的物理过程。制造了两种类型的SCC，其最小抗压强度分别为30 MPa和45 MPa。分析的性能为硬化的SCC的密度，收缩龟裂，抗冻融性，抗热冲击老化性和耐磨性。将获得的结果与对照混凝土的结果进行比较，在影响耐久性的物理攻击下观察SCC的巨大容量。这项研究的结果表明，可以使用来自预制件的再生骨料在同一预制行业中制造自密实再生混凝土。但是，对于100％的替代，会发生较高的专有权损失，而对于20％和50％的替代，相对于对照混凝土的变化则较小。此外，利用这些废物将其重新整合到生产链中有助于实现更可持续的建设。这项研究的结果表明，可以使用来自预制件的再生骨料来制造同一预制行业中的自密实再生混凝土。但是，对于100％的替代，会发生较高的专有权损失，而对于20％和50％的替代，相对于对照混凝土的变化则较小。此外，利用这些废物将其重新整合到生产链中有助于实现更可持续的建设。这项研究的结果表明，可以使用来自预制件的再生骨料在同一预制行业中制造自密实再生混凝土。但是，对于100％的替代，会发生较高的专有权损失，而对于20％和50％的替代，相对于对照混凝土的变化则较小。此外，利用这些废物将其重新纳入生产链有助于更可持续的建设。