Even presenting several drawbacks, especially regarding environmental impact, concrete is the most consumed human-made material worldwide. In this sense, incorporating steel fibres and recycled aggregates, and applying the functionally graded material concept may help in the sustainability of concrete. In this paper, relationships between mechanical properties, embodied CO₂, cost, among other parameters of functionally graded concretes (FGC) incorporating steel fibres and recycled aggregates were studied. The test results show that the FGC mechanical performance is inferior to fibre reinforced concrete but superior to fibre reinforced recycled aggregate concrete. Therefore, the FGC studied could be used in lower loading capacity applications, such as car parks and cycling lanes. In terms of embodied CO₂ and cost, the FGC studied are more affected by the content of fibre than the content of recycled aggregates. Also, equations correlating design and sustainability parameters with reinforced thickness and content of fibre were proposed.

即使存在一些缺点，特别是在环境影响方面，混凝土也是全世界消耗最频繁的人造材料。从这个意义上讲，将钢纤维和再生骨料结合在一起，并应用功能梯度材料的概念可能有助于混凝土的可持续性。在本文中，研究了包含钢纤维和再生骨料的功能梯度混凝土（FGC）的力学性能，内含CO ₂，成本以及其他参数之间的关系。试验结果表明，FGC的力学性能不如纤维增强混凝土，但优于纤维增强再生骨料混凝土。因此，所研究的FGC可用于较低载重的应用，例如停车场和自行车道。在体现CO方面₂和成本方面，所研究的FGC受纤维含量的影响大于回收骨料的含量。此外，提出了将设计和可持续性参数与纤维的厚度和含量相关的方程。