Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors

SHEN Qizhen; PAN Ganghua

doi:10.11835/j.issn.2096-6717.2021.190

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Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors

Civil Engineering | 更新时间：2023-07-10

- Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 154-162(2023)
- 作者机构：
  
  1.鲁东大学土木工程学院，山东烟台 264025
  2.东南大学材料科学与工程学院，南京 211189
- 作者简介：
  
  brief: SHEN Qizhen (1988- ), PhD, main research interest: durability of concrete structure, E-mail: 3510@ldu.edu.cn.
- 基金信息：
  
  Natural Science Foundation of Shandong Province(ZR2020QE250)
- DOI：10.11835/j.issn.2096-6717.2021.190
  CLC： TU528
- Received：20 May 2021，
  
  Published：25 August 2023
- 稿件说明：
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SHEN Qizhen, PAN Ganghua. Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 154-162.
DOI：

SHEN Qizhen, PAN Ganghua. Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 154-162. DOI： 10.11835/j.issn.2096-6717.2021.190.

摘要

集料和界面过渡区对水泥基材料抗碳化性能有显著影响。基于Fick第二定律，提出一种考虑集料和界面过渡区影响的CO

扩散模型，模型中首次引入界面过渡区的扩散系数并给出相应参数的计算方法，并基于质量守恒定律给出CO

反应模型，利用该模型研究荷载作用下C30和C50混凝土中CO

的浓度分布。结果表明，考虑集料和界面过渡区影响能更准确地计算CO

在水泥基材料中的扩散系数及碳化深度值。通过与文献中的试验数据进行比较，进一步验证了理论模型的可靠性。模型将集料和界面过渡区作为评价混凝土耐久性的重要因素，为钢筋混凝土结构的设计和寿命预测提供依据。

Abstract

Aggregate and interfacial transition zone (ITZ) have significant influence on the carbonation resistance of cementitious materials. Based on Fick's second law

a CO

diffusion model considering the influence of aggregates and ITZ is proposed in this paper

the diffusion coefficient of interfacial transition zone is introduced for the first time and the calculation method of corresponding parameters in this model is given. At the same time

a CO

reaction model is established based on the law of mass conservation

and the CO

concentration distribution in C30 and C50 concrete under load is studied by using this model. The results show that the diffusion coefficient and depth of carbonation of CO

in cementitious materials can be calculated more accurately by considering aggregate and ITZ effects. Finally

the reliability of the theoretical model is further verified by comparing with the experimental data in literature. Therefore

the model takes aggregate and ITZ as important factors to evaluate the durability of concrete

which provides foundation for the design and life prediction of reinforced concrete structures.

关键词

Keywords

references

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