Value-added recycling of waste concrete fines into alternative aggregates for river sand conservation

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Renjie Zhou , Yunjie Luo , Mingfang Ba , Zihua Zhang , Jianghua Fang , Chi Sun Poon , Xiaoliang Fang
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Abstract

Due to the depletion of river sand, the construction industry is eager to develop upcycling techniques for transforming secondary by-products derived from construction and demolition (C&D) waste into quality fine aggregates. This paper presents a study of replacing river sand with enhanced recycled fine aggregate through a wet carbonation process developed by the authors previously. The fine recycled concrete aggregate (FRCA) ranging from 0.15 to 5 mm was prepared by demolishing a concrete with a known mixture design. After wet carbonation, the particle size, water absorption, and density of the FRCA were tested and compared with the original samples. The chemical characteristics of the original and carbonated FRCA (C-FRCA) were analyzed by a series of experiments. The results showed that (1) an increase of carbonation products and a significant reduction of hydration products; (2) microscopic observation of the C-FRCA showed a surface layer densified by calcite after wet carbonation; and (3) no significant strength loss were observed when replacing up to 50% river sand by C-FRCA in mortar specimens. The potential environmental and economic impacts were also analyzed.

Abstract Image

将废弃混凝土细料回收增值为河沙保护的替代骨料
由于河砂的枯竭,建筑行业迫切希望开发升级再循环技术,将建筑和拆除(C&D)废料中的次级副产品转化为优质细骨料。本文介绍了一项通过作者之前开发的湿碳化工艺,用强化再生细骨料替代河砂的研究。0.15 至 5 毫米的细再生混凝土骨料(FRCA)是通过已知混合物设计的混凝土拆卸制备的。湿法碳化后,对 FRCA 的粒度、吸水性和密度进行了测试,并与原始样品进行了比较。通过一系列实验,分析了原始和碳化后 FRCA(C-FRCA)的化学特性。结果表明:(1) 碳化产物增加,水化产物显著减少;(2) C-FRCA 的显微镜观察显示,湿碳化后方解石使表面层致密化;(3) 在砂浆试样中用 C-FRCA 替代 50% 的河砂时,未观察到明显的强度损失。此外,还分析了潜在的环境和经济影响。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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