Construction and demolition waste (CDW) worldwide generation accounts 10 billion tonnes yearly. The major fraction is landfilled requiring innovative recycling methods to reduce the associated environmental impacts and to increase its circularity. Our study demonstrated the feasibility of using different CDW fines to develop recycled cements and optimized the content of CDW recycled cements with well-graded crushed stone (WGCS) for use as pavement base layer. We scaled up the study obtaining CDW cement and aggregates from a local recycling plant, as well as pilot pavement sections designed, constructed and field deflections measured. As results, the CDW cement pastes exhibited accumulated heat values of up to 111 J g−1 and achieved a compressive strength of approximately 16 MPa. The unconfined compressive strength and resilient modulus (RM) achieved using CDW cement and WGCS were 2–3 and >3000 MPa, respectively. The sections constructed using CDW cement exhibited intermediate behaviour compared to those obtained using reference materials (6% Portland cement-WGCS and a conventional granular base made using WGCS). The deflection decreased over time owing to the pozzolanic reaction.

中文翻译：

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来自建筑和拆除废物的热活化水泥用于稳定路面基层：巴西案例研究

全球每年产生的建筑和拆除垃圾 (CDW) 达 100 亿吨。大部分被填埋，需要创新的回收方法来减少相关的环境影响并增加其循环性。我们的研究论证了使用不同 CDW 细粉开发再生水泥的可行性，并优化了 CDW 再生水泥与级配碎石 (WGCS) 的含量，用作路面基层。我们扩大了研究范围，从当地一家回收厂获取了车辆碰撞垃圾水泥和骨料，并设计、建造了试点路面部分并测量了现场挠度。结果，CDW 水泥浆体的积热值高达 111 J g−1并达到约16 MPa的抗压强度。使用 CDW 水泥和 WGCS 实现的无侧限抗压强度和回弹模量 (RM) 分别为 2-3 和 >3000 MPa。与使用参考材料（6% 波特兰水泥-WGCS 和使用 WGCS 制成的传统颗粒基底）获得的截面相比，使用 CDW 水泥建造的截面表现出中间的性能。由于火山灰反应，偏转随着时间的推移而减小。