Selecting efficient and economical methods to recycle the original concrete in construction and demolition wastes is regarded as one of the obstacles for construction companies to successfully achieve sustainable development. This study explored this challenging task by examining the influences of the compressive strength ratio between original concrete and recycled aggregate concrete on the slump, compressive strength, and carbonation resistance of recycled aggregate concrete. The microstructures of new and old mortars in the recycled aggregate concrete before and after carbonation were further investigated. A new sustainable construction design reflecting the compressive strength ratio effect was proposed. Results revealed that adjusting the compressive strength ratio can furnish different slump, compressive strength, and carbonation depth values, while also reducing mortar inhomogeneities. Specifically, increasing the compressive strength ratio could improve these properties, which are in agreement with the results using some time-consuming and uneconomical strengthening techniques in the published literature. Therefore, construction companies can use more original concrete by adjusting the compressive strength ratio according to the requirements of different structures. Additionally, the construction waste treatment organizations should classify the waste concretes from different sites rather than mixing them and then directly utilizing them in actual projects.

选择有效和经济的方法来回收建筑废料和拆迁废料中的原始混凝土被视为建筑公司成功实现可持续发展的障碍之一。这项研究通过检查原始混凝土和再生骨料混凝土之间的抗压强度比对再生骨料混凝土的坍落度，抗压强度和抗碳化性的影响，探索了这一具有挑战性的任务。碳化前后，再生骨料混凝土中新旧砂浆的微观结构得到了进一步的研究。提出了一种反映抗压强度比效应的新型可持续建筑设计方案。结果表明，调整抗压强度比可以提供不同的坍落度，抗压强度，和碳化深度值，同时还减少了砂浆的不均匀性。具体来说，增加抗压强度比可以改善这些性能，这与使用已公开文献中的一些耗时且不经济的强化技术的结果是一致的。因此，建筑公司可以根据不同结构的要求通过调整抗压强度比来使用更多的原始混凝土。此外，建筑废料处理组织应该对不同地点的废混凝土进行分类，而不是将它们混合然后直接用于实际项目中。与发表的文献中使用一些耗时且不经济的强化技术得出的结果一致。因此，建筑公司可以根据不同结构的要求通过调整抗压强度比来使用更多的原始混凝土。此外，建筑废料处理组织应该对不同地点的废混凝土进行分类，而不是将它们混合然后直接用于实际项目中。与发表的文献中使用一些耗时且不经济的强化技术得出的结果一致。因此，建筑公司可以根据不同结构的要求通过调整抗压强度比来使用更多的原始混凝土。此外，建筑废料处理组织应该对不同地点的废混凝土进行分类，而不是将它们混合然后直接用于实际项目中。