Concrete waste is the most prominent construction and demolition waste generated by the construction industry, which is mainly disposed to landfills. Recycling this waste in the form of recycled concrete aggregates (RCA) and substituting it for natural aggregates in the production of concrete could lead to environmental conservation. A growing body of literature in lab settings has already recognized the importance of utilizing RCA in the production of new concrete. However, intense utilization of RCA in the large-scale industrial production of new concrete (structural and non-structural) is not widely accepted by international standards due to its high porosity, a disparity of source concrete and lack of territorial field studies. In this paper, two full-scale field studies of the foundation system and municipal sidewalk constructed with recycled aggregate concrete (RAC) are presented. In addition to this, the long-term performance of RAC examined for 5 years in terms of in-place compressive strength is reported. Moreover, strength correlations developed specifically for RAC for the estimation of compressive strength based on rebound numbers are discussed. This study shows that RCA has significant potential of using as substitution of natural aggregate in the production of concrete of 25 and 32 MPa compressive strength. Furthermore, RAC shows a higher rate of compressive strength development after 28 days of curing and results in comparable long-term compressive strength to conventional concrete. By providing an insight into the sustainable application of RCA in the production of new concrete, the results of this study can serve as a basis for updating the current standards in Canada.

混凝土废物是建筑业产生的最主要的建筑和拆除废物，主要处理到垃圾填埋场。以再生混凝土骨料（RCA）的形式回收这些废物，并在混凝土生产中将其替换为天然骨料可导致环境保护。实验室环境中越来越多的文献已经认识到在新混凝土生产中利用RCA的重要性。但是，由于RCA的高孔隙率，原料混凝土的差异以及缺乏领域的研究，在新混凝土的大规模工业生产（结构和非结构）中大量使用RCA尚未被国际标准接受。在本文中，提出了对基础系统和使用再生骨料混凝土（RAC）建造的市政人行道的两项全面现场研究。除此之外，据报道，就现场抗压强度而言，RAC进行了5年的长期性能测试。此外，讨论了专门为RAC开发的强度相关性，用于基于回弹数估算抗压强度。这项研究表明，RCA在生产抗压强度为25和32 MPa的混凝土时，具有取代天然骨料的巨大潜力。此外，RAC在固化28天后显示出更高的抗压强度发展速度，并具有与传统混凝土相当的长期抗压强度。