Utilization of carbonated recycled concrete powder in alkali-activated slag considering reaction duration effect

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

Construction and Building Materials Pub Date : 2025-10-06 DOI:10.1016/j.conbuildmat.2025.143917

Hao Wang , Liang Wang , Ying Xu , Qi Li , Jian Zhou , Rui Wu

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引用次数: 0

Abstract

The aqueous carbonation of recycled concrete powder (RCP) is considered a promising approach to reduce carbon footprint in the environment and enhance RCP properties for use in new concrete. This work investigated the effects of RCP with different carbonation durations as a partial granulated blast furnace slag (GBFS) replacement on the setting and hardening properties of alkali-activated slag (AAS). In addition, the physical and chemical properties of RCP carbonated for different durations were characterized. Results showed that the carbonation degree of RCP increased with prolonging carbonation duration, reaching a maximum CO₂ uptake of 13.2 % after 20 min of carbonation. The submicron grade calcite particles and silica gel were identified as the dominant carbonated products. They promoted the C-(A)-S-H developed and refined the pore structure of blended mortars by filling effect and activity effect. As a result, the compressive strength of blended mortars with carbonated RCP achieved 7.3–22.3 % increments at 28d, compared to the blended mortar with pristine RCP. Moreover, the rapidly setting issue of AAS mortar could be alleviated by carbonated RCP with a long reaction duration. These findings provide a sustainable and effective solution for value-added application of RCP in the construction industry.

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考虑反应时间效应的碳化再生混凝土粉在碱活性矿渣中的利用

再生混凝土粉（RCP）的水碳化被认为是一种很有前途的方法，可以减少环境中的碳足迹，提高RCP的性能，用于新混凝土。本文研究了不同碳化时间的RCP作为部分颗粒化高炉渣（GBFS）替代品对碱活性渣（AAS）凝固和硬化性能的影响。此外，还对不同碳化时间RCP的理化性质进行了表征。结果表明，随着炭化时间的延长，RCP的炭化程度逐渐增加，在炭化20 min后达到最大CO2吸收量13.2 %。亚微米级方解石颗粒和硅胶是主要的碳酸化产物。它们通过填充效应和活性效应促进了C-(A)- s - h的发育和细化了混合砂浆的孔隙结构。结果表明，与原始RCP混合砂浆相比，碳化RCP混合砂浆的抗压强度在28d时增加了7.3 - 22.3% %。反应时间长的碳化RCP可以缓解AAS砂浆的快速凝固问题。这些发现为RCP在建筑行业的增值应用提供了可持续和有效的解决方案。

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.