Structural behavior of sustainable recycled aggregate concrete beams

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-08 DOI:10.1016/j.conbuildmat.2025.143938

Fernanda de Andrade Salgado, Flávio de Andrade Silva

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引用次数: 0

Abstract

Construction and Demolition Waste management remains a global challenge, with improper disposal leading to environmental contamination and health hazards. The use of recycled aggregates from Construction and Demolition Waste offers a promising solution, yet its utilization in structural concrete is hindered by regulatory constraints and lack of understanding of its structural performance. This paper investigates the structural behavior of mixed recycled concrete beams shedding light on the viability of using mixed recycled aggregates in structural concrete, thus enhancing sustainable construction practices. The Compressible Packing Model was used to design recycled aggregate concretes (C30 and C50) with 20 %, 50 %, and 100 % mixed recycled aggregates. The results showed that even 100 % replacement of natural aggregate with mixed recycled aggregate had no significant impact on the fresh and hardened properties of concrete. It also confirmed that the Compressible Packing Model is effective for designing mixed recycled aggregate concretes up to strength class C50. Furthermore, flexural tests on short reinforced concrete beams containing up to 15 % ceramic fragments showed no significant difference compared to conventional concrete beams.

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可持续再生骨料混凝土梁的结构性能

建筑和拆除废物管理仍然是一项全球性挑战，处置不当导致环境污染和健康危害。从建筑和拆除垃圾中回收骨料的使用提供了一个很有前途的解决方案，但其在结构混凝土中的应用受到监管限制和缺乏对其结构性能的了解的阻碍。本文研究了混合再生混凝土梁的结构行为，阐明了在结构混凝土中使用混合再生骨料的可行性，从而增强了可持续建筑实践。采用可压缩填料模型设计再生骨料混凝土（C30和C50），分别为20% %、50% %和100% %混合再生骨料。结果表明，即使用再生混合骨料代替100% %的天然骨料，对混凝土的新鲜性能和硬化性能也没有显著影响。同时也证实了可压缩填料模型对于设计强度等级为C50的混合再生骨料混凝土是有效的。此外，对含有高达15% %陶瓷碎片的短钢筋混凝土梁的弯曲试验表明，与传统混凝土梁相比，没有显著差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.