工业环境下酸性气体腐蚀混凝土的数值模拟

曹志远; 牛荻涛; 吕瑶

doi:10.3724/j.gyjzG24100602

工业环境下酸性气体腐蚀混凝土的数值模拟

doi: 10.3724/j.gyjzG24100602

曹志远¹,
牛荻涛^1,2, ,,
吕瑶¹

1. 西安建筑科技大学土木工程学院, 西安 710055;
2. 绿色建筑全国重点实验室, 西安 710055

基金项目:

国家自然科学基金项目(52078413,51808437)

教育部"创新团队发展计划"(IRT_17R84)。

详细信息

作者简介:
曹志远,博士研究生,主要从事混凝土耐久性研究,1456209595@qq.com。

通讯作者:
牛荻涛,博士,教授,niuditao@163.com。

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- 文章访问数: 59
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- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2024-10-06
- 网络出版日期: 2025-03-28

Numerical Simulation of Acid Gas Corroded Concrete in Industrial Environment

CAO Zhiyuan¹,
NIU Ditao^{1,2
, ,},
LYU Yao¹

1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. State Key Laboratory of Green Building in Western China, Xi'an 710055, China

摘要

摘要: 建立了CO₂和SO₂耦合腐蚀混凝土的中性化模型,模型考虑了混凝土中固相钙的溶解过程和硫化产物引起的膨胀损伤。研究了不同水灰比(0.37、0.47、0.57)对混凝土中性化过程影响。分析了腐蚀后混凝土的中性化程度、气体扩散系数、孔隙率、CaCO₃含量和CaSO₄含量的变化。结果表明:随着水灰比的增加,混凝土中CO₂气体的存在范围逐渐增大,而SO₂的存在范围几乎相同。腐蚀28 d后,随着混凝土水灰比减小,混凝土孔隙率减小幅度逐渐增大,不同水灰比混凝土中产生的膨胀损伤几乎相同,在孔隙率增加的区域,混凝土孔隙率变化趋势相似。随着水灰比增加,混凝土完全硫化区长度增加,部分硫化区长度减少,混凝土部分碳化区长度逐渐增加。
- 工业环境 /
- 酸性气体腐蚀混凝土 /
- 中性化 /
- 气体传输 /
- 多反应动力学
Abstract: The neutralization model of concrete corroded by CO₂ and SO₂ coupling was established. The model considered the dissolution process of solid calcium in concrete and the expansion damage caused by sulfation products. The influence of different water-cement ratios (0.37, 0.47, 0.57) on the neutralization process of concrete was studied. The changes of neutralization degree, gas diffusion coefficient, porosity, CaCO₃ content and CaSO₄ content of corroded concrete were analyzed. The results showed that with the increase of water-cement ratio, the diffusion range of CO₂ gas in concrete gradually increased, while the diffusion range of SO₂ was almost the same. After 28 days of corrosion, with the decrease of the water-cement ratio of concrete, the decrease in porosity of concrete increased gradually, and the expansion damage in concrete with different water-cement ratios was almost the same. In the area of increasing porosity, the change trends of concrete porosity were similar. With the increase of the water-cement ratio, the length of the complete sulfation area of concrete increased, the length of the partial sulfation area decreased, and the length of the partial carbonation area of concrete gradually increased.
- industrial environment /
- acid gases corroded concrete /
- neutralization /
- gas transmission /
- multi-reaction kinetics

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