Theoretical and numerical models on the carbonation of self‐compacting recycled aggregate concrete

IF 8.1 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2026-10-01 DOI:10.1016/j.jobe.2026.117488

Xuyong Chen, Youhong Xu, Zhenyang Tan, Song Lei, Shukai Cheng, Xiaobing Hu

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引用次数: 0

Abstract

The carbonation resistance of self-compacting recycled aggregate concrete (SCRAC) is of great importance for its durability design. However, existing prediction models poorly capture the effects of recycled aggregate content and CO2 concentration. This study investigates the carbonation behavior of SCRAC through accelerated carbonation tests, theoretical model, and numerical model, with recycled coarse aggregate replacement ratio (0–100%) and CO2 concentration (20–95%) as the primary variables. Results showed carbonation depth increased monotonically with both replacement ratio and CO2 concentration. The carbonation depth of full recycled aggregate concrete increased by 52.0% compared to natural aggregate concrete. Based on Fick's second law, a theoretical prediction model was developed. The model reduced the error by about 22% compared with the Chinese standard model. A COMSOL model incorporating modified diffusion and reaction coefficients reproduced the measurements within a 10% relative error. The model offers a calibrated empirical relationship for estimating the carbonation depth of SCRAC under accelerated carbonation conditions.

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自密实再生骨料混凝土碳化的理论与数值模型

自密实再生骨料混凝土的抗碳化性能对其耐久性设计具有重要意义。然而，现有的预测模型很难捕捉到再生骨料含量和CO2浓度的影响。本研究以再生粗骨料替代率（0 ~ 100%）和CO2浓度（20 ~ 95%）为主要变量，通过加速碳化试验、理论模型和数值模型研究了SCRAC的碳化行为。结果表明，碳酸化深度随替代率和CO2浓度的增加而单调增加。全再生骨料混凝土的碳化深度比天然骨料混凝土提高了52.0%。基于菲克第二定律，建立了理论预测模型。与中国标准模型相比，该模型的误差降低了约22%。采用改进的扩散和反应系数的COMSOL模型在10%的相对误差内再现了测量结果。该模型为估计加速碳化条件下SCRAC的碳化深度提供了校准的经验关系。

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

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.