The fate of heavy metals in recycled concrete paste upon enforced carbonation: A review

IF 6.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances Pub Date : 2025-09-14 DOI:10.1016/j.rcradv.2025.200289

Kristen Sodam Park , Maciej Zajac , Thomas Matschei , Anya Vollpracht

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Abstract

Enforced carbonation of recycled concrete paste (RCP) presents a promising solution for carbon capture and utilization (CCU) in the cement and construction industries. By transforming concrete waste into a reactive pozzolan while sequestering CO₂, enforced carbonation addresses major environmental challenges and aligns with the circular economy concept in the cement and concrete sector. This review contextualizes the impact of enforced carbonation on heavy metals in RCP to ensure sustainable and ecological compatibility of both the process and the final product, carbonated RCP (cRCP). It summarizes current knowledge on heavy metals in cement and proposes hypotheses on their plausible immobilization mechanisms in enforced-carbonated materials. The review highlights gaps in the literature concerning the impact of carbonation on heavy metals in cement, underscoring the necessity of exploring novel approaches for assessing the heavy metal behaviors from RCP to cRCP.

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强制碳化后再生混凝土膏体中重金属的命运：综述

再生混凝土膏体（RCP）的强制碳化为水泥和建筑行业的碳捕获和利用（CCU）提供了一个有前途的解决方案。通过将混凝土废料转化为活性火山灰，同时封存二氧化碳，强制碳化解决了主要的环境挑战，并符合水泥和混凝土行业的循环经济概念。本文综述了强制碳化对RCP中重金属的影响，以确保过程和最终产品碳化RCP （cRCP）的可持续性和生态兼容性。它总结了目前对水泥中重金属的认识，并提出了关于它们在强制碳化材料中的合理固定机制的假设。这篇综述强调了关于碳酸化对水泥中重金属影响的文献空白，强调了探索新的方法来评估从RCP到cRCP的重金属行为的必要性。

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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