Recycling recycled concrete powder into low-carbon construction material through compaction and carbonation

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2025-06-13 DOI:10.1016/j.resconrec.2025.108456

Zongxuan Shao , Yuya Sakai

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引用次数: 0

Abstract

The recycling of concrete waste aggregate generates abundant recycled concrete powder (RCP) annually that remains underutilized. Previous studies have shown that the compaction-based recycling of concrete requires autoclave treatment to achieve sufficient strength, which consumes considerable energy. This study combined carbonation with compaction to recycle RCP into construction materials with low carbon emissions. The effects of variable aggregate content, compaction and carbonation on strength and interparticle bonding were investigated using several characterization techniques. Results showed that the compacted material had a compressive strength above 40 MPa without relying on hydration reactions. CaCO₃ grew on adjacent particles, became interconnected, and formed interparticle crystal bridges, shifting the mechanism of particle bonding from physical contact produced under pressure to chemical crystal bridge bonding. Both the pressure level and aggregate content exhibited a coupled effect on carbonation. CO₂ uptake offset the energy consumption of production, offering a low-carbon method for RCP recycling.

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将再生混凝土粉通过压实、碳化等工艺加工成低碳建筑材料

混凝土废骨料的回收利用每年产生大量的再生混凝土粉（RCP），但仍未得到充分利用。先前的研究表明，基于压实的混凝土回收需要高压釜处理才能达到足够的强度，这需要消耗相当大的能量。本研究采用碳化与压实相结合的方法，将RCP回收为低碳排放的建筑材料。采用多种表征技术研究了不同骨料含量、压实和碳化对强度和颗粒间结合的影响。结果表明，在不依赖水化反应的情况下，压实材料的抗压强度在40 MPa以上。CaCO3在相邻颗粒上生长，相互连接，形成颗粒间的晶桥，使颗粒间的键合机制由压力下产生的物理接触转变为化学晶桥键合。压力水平和骨料含量对碳酸化具有耦合效应。二氧化碳的吸收抵消了生产的能源消耗，为RCP回收提供了一种低碳方法。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.