The effect of NaHCO3 accelerated carbonation method on the early mechanical properties of recycled aggregate concrete

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-29 DOI:10.1016/j.istruc.2024.107647

Ruitian Xu , Ying Liang , Fan Ning , Zongping Chen

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Abstract

In order to simplify the carbon sequestration process of recycled aggregate concrete (RAC), this paper proposes a method of using sodium bicarbonate (NaHCO₃) solution to cure RAC and accelerate carbonation. The compressive and flexural tests of 135 specimens were completed, and the effects of three carbonation environments and carbonation age on the early mechanical properties of RAC were studied. The results indicate that the carbonation environment of NaHCO₃ solution can significantly improve the early compressive strength and flexural strength of RAC, but it will reduce ductility. Before 21d, the early compressive strength and strength development of RAC after carbonation of NaHCO₃ solution were slightly lower than those in the carbonation environment of the carbonation box, but significantly improved at 28d. The carbonation age has little effect on the flexural strength of RAC, but at the same age, the flexural strength of RAC was highest after carbonation in NaHCO₃ solution. Through thermogravimetric analysis, it was found that the calcium carbonate content in RAC after carbonation of NaHCO₃ solution was 10.3 % higher than that after carbonation in the carbonation box, and 16.5 % higher than that of natural carbonation, offering an alternative pathway for carbon sequestration in RAC.

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NaHCO3 加速碳化法对再生骨料混凝土早期力学性能的影响

为了简化再生骨料混凝土（RAC）的碳封存过程，本文提出了一种利用碳酸氢钠（NaHCO3）溶液固化 RAC 并加速碳化的方法。完成了 135 个试件的抗压和抗折试验，并研究了三种碳化环境和碳化龄期对 RAC 早期力学性能的影响。结果表明，NaHCO3 溶液的碳化环境能显著提高 RAC 的早期抗压强度和抗折强度，但会降低延展性。21d 前，NaHCO3 溶液碳化后 RAC 的早期抗压强度和强度发展略低于碳化箱的碳化环境，但在 28d 时得到明显改善。碳化龄期对 RAC 的抗折强度影响不大，但在相同龄期，在 NaHCO3 溶液中碳化后 RAC 的抗折强度最高。通过热重分析发现，NaHCO3 溶液碳化后 RAC 中的碳酸钙含量比碳化箱碳化后高 10.3%，比自然碳化高 16.5%，这为 RAC 的碳封存提供了另一种途径。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.