工业燃煤烟气下混凝土结构的腐蚀

郭亮; 主父高林; 刘西光; 牛荻涛; 高鹏; 杨腾

doi:10.3724/j.gyjzG24092302

工业燃煤烟气下混凝土结构的腐蚀

doi: 10.3724/j.gyjzG24092302

1. 陕西延长中煤榆林能源化工股份有限公司, 陕西榆林 718599;
2. 西安建筑科技大学土木工程学院, 西安 710055;
3. 机械工业勘察设计研究院有限公司城市体检更新与设计研究院, 西安 710043

详细信息

作者简介:
郭亮,工程师,主要从事混凝土耐久性研究。

通讯作者:
刘西光,博士,教授,主要从事工程结构全寿命周期安全性与耐久性方面的研究,xgliu@xauat.edu.cn。

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出版历程
- 收稿日期: 2024-09-23
- 网络出版日期: 2025-03-28

Corrosion of Concrete Structures Exposed to Industrial Coal-Fired Flue Gas

1. Shaanxi Yanchang Zhongmei Yulin Energy and Chemical Co., Ltd., Yulin 718599, China;
2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
3. China JiKan Research Institute of Engineering Investigation and Design, Co., Ltd., Xi'an 710043, China

摘要

摘要: 工业生产中煤炭燃烧会排放大量SO₂、CO₂气体,高浓度酸性气体会加速混凝土腐蚀劣化,造成结构提前失效或破坏。为研究暴露于工业燃煤烟气下12年的混凝土结构的腐蚀行为,本文通过现场试验和室内试验测试了混凝土的宏观力学性能、孔隙结构特征和微观特性沿高度和深度的变化规律。试验结果表明:沿结构高度方向混凝土呈现明显的不均匀腐蚀,严重侵蚀区(28.6~39.1 m)混凝土中性化深度是轻微侵蚀区(0~6.6 m)的1.4倍,孔隙率是5倍。沿侵蚀深度方向混凝土内部呈现不同的侵蚀机理。浅层区域混凝土(0~8 mm)主要发生硫化侵蚀,侵蚀产物为石膏(Gyp),pH值小于8.0,暴露面的硫酸根离子(SO^2-₄)浓度高达5.5%。共存区(8~14 mm)混凝土硫化、碳化侵蚀并存,pH值由8.0升至11.0,超过14 mm后SO^2-₄和Gyp均消失,在10 mm处发现碳酸钙(CaCO₃)且含量逐渐增多。深层混凝土(14~18 mm)主要发生碳化侵蚀,侵蚀产物为CaCO₃,pH值稳定在11.5。
- 燃煤烟气 /
- 混凝土 /
- 中性化 /
- 硫化 /
- 碳化 /
- 腐蚀
Abstract: Coal combustion of industrial production will release large amounts of SO₂ and CO₂ gases. High concentrations of acidic gases will accelerate the deterioration of concrete corrosion, leading to premature failure or damage to structures. To investigate the corrosion behavior of concrete structures exposed to industrial coal-fired flue gas for 12 years, this paper tested the concrete’s macro-mechanical properties, pore structure characteristics, and micro-properties by in-situ and laboratory tests along the height and depth. The test results indicated that the concrete exhibited significant uneven corrosion along the height of the structure. In the severely attacked region (28.6-39.1 m), the neutralization depth in the concrete was 1.4 times greater than that in the slightly attacked region (0-6.6 m), and the porosity was 5 times higher. Different corrosion mechanisms were occurred inside the concrete along the corrosion depth direction. In the shallow concrete zone (0-8 mm), sulfation was predominant, with gypsum (Gyp) as the primary product. The pH was below 8.0, and the sulfate ion (SO^2-₄) concentration at the exposure surface reached up to 5.5%. In the coexistence concrete zone (8-14 mm), both sulfation and carbonation were presented, with the pH increasing from 8.0 to 11.0. Above 14 mm, SO^2-₄ and Gyp were no longer detected. At 10 mm, calcium carbonate (CaCO₃) was found, and its content gradually increased. In the deep concrete zone (14-18 mm), carbonation was the dominant process, with CaCO₃ as the main product.
- coal-fired flue gas /
- concrete /
- neutralization /
- sulfation /
- carbonation /
- corrosion

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