Upcycling of construction and demolition waste: Recovery and reuse of binder and fine aggregate in cement applications to achieve circular economy

IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL

Cleaner Engineering and Technology Pub Date : 2025-02-01 DOI:10.1016/j.clet.2024.100864

Ravi Chandra Malladi , Aswathy Ajayan S , Gayathri Chandran , Thirumalini Selvaraj

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Abstract

The effective recycling and utilization of construction and demolition (C&D) waste to its maximum capacity to achieve a circular economy model is challenging in the current scenario. This current research emphasizes upcycling C&D waste using an acid dissolution method to separate the binder and aggregate fractions, and their performance was evaluated in cement mortar mixtures. The results showed that replacing 20% of cement with the recovered binder improved compressive strength by 8.07%, enhanced hydration product formation, and decreased water absorption and porosity by 11.48% and 5.21%, respectively. Replacing natural sand with recycled aggregates also resulted in comparable strength gains compared to reference mortars. The complete utilization of the secondary products from the upcycled C&D waste in construction activities helps to achieve sustainable development goals by reducing the carbon footprint and contributing to a circular economy model.

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建筑和拆除垃圾的升级回收：水泥应用中粘合剂和细骨料的回收和再利用，以实现循环经济

在当前情况下，有效回收和利用建筑和拆除（C&；D）废物以最大限度地实现循环经济模式是一项挑战。目前的研究重点是利用酸溶法对C&；D废物进行升级回收，以分离粘结剂和骨料组分，并评估了它们在水泥砂浆混合物中的性能。结果表明，用再生胶凝剂替代20%的水泥，抗压强度提高8.07%，水化产物形成增强，吸水率和孔隙率分别降低11.48%和5.21%。与参考砂浆相比，用再生骨料代替天然砂也产生了相当的强度增益。在建筑活动中充分利用升级再造的c&d废物的二次产品，通过减少碳足迹和促进循环经济模式，有助于实现可持续发展目标。

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