Scholarlink

<p>This paper proposes a non-destructive method for evaluating concrete carbonation through direct Carbonation Flux Test (CFT). The approach calculates the diffusion resistance factor R<sub>c</sub>, defined as the ratio between carbonation depth and the CO<sub>2</sub> effective diffusion coefficient of concrete. The setup uses a sealed cell on the concrete surface to monitor CO<sub>2</sub> flux and interprets it with a simplified model based on Fick’s second law. CFT was validated through numerical and experimental tests on low-clinker concrete mixes. Four mixtures with different compositions and curing durations were monitored over a period of six months under natural carbonation (60% RH, 20&#xa0;°C). Results from CFT were compared to those from phenolphthalein testing (for carbonation depth) and the oxygen diffusion method (for CO<sub>2</sub> effective diffusion). CFT showed consistent repeatability, with over 78.21% results showing a relative standard deviation below 30%. CFT assesses carbonation progression in real time. Its agreement with reference methods and in-situ applicability supports its use for carbonation evaluation in concrete systems. Future work will focus on optimizing cell design by studying leakage mechanisms and developing improved sealing strategies to further enhance measurement accuracy and reliability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Non-destructive assessment of concrete carbonation based on the CO2 diffusion resistance factor

  • 期刊论文

  • 发表日期：

    2026年3月23日

查看全文
  • O. Qacami,
  • B. Huet,
  • P. Turcry,
  • A. Aït-Mokhtar,
  • R. A. Patel,
  • F. Dehn

摘要

This paper proposes a non-destructive method for evaluating concrete carbonation through direct Carbonation Flux Test (CFT). The approach calculates the diffusion resistance factor Rc, defined as the ratio between carbonation depth and the CO2 effective diffusion coefficient of concrete. The setup uses a sealed cell on the concrete surface to monitor CO2 flux and interprets it with a simplified model based on Fick’s second law. CFT was validated through numerical and experimental tests on low-clinker concrete mixes. Four mixtures with different compositions and curing durations were monitored over a period of six months under natural carbonation (60% RH, 20 °C). Results from CFT were compared to those from phenolphthalein testing (for carbonation depth) and the oxygen diffusion method (for CO2 effective diffusion). CFT showed consistent repeatability, with over 78.21% results showing a relative standard deviation below 30%. CFT assesses carbonation progression in real time. Its agreement with reference methods and in-situ applicability supports its use for carbonation evaluation in concrete systems. Future work will focus on optimizing cell design by studying leakage mechanisms and developing improved sealing strategies to further enhance measurement accuracy and reliability.