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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

期数:

2026年02期

页码:

86-96

栏目:

建筑材料

出版日期:

2026-03-30

文章信息/Info

Title:

Research on spatiotemporal evolution patterns of carbonation zones in concrete under combined action of load and carbonation

文章编号:

1673-2049(2026)02-0086-11

作者:

赵燕茹¹,李龙¹,关鹤²,王晓勇³

(1. 内蒙古工业大学 土木工程学院,内蒙古 呼和浩特 010051; 2. 内蒙古工业大学 理学院,内蒙古呼和浩特 010051; 3. 通辽市住房和城乡建设局综合保障中心,内蒙古 通辽 028000)

Author(s):

ZHAO Yanru¹, LI Long¹, GUAN He², WANG Xiaoyong³

(1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 2. College of Science, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 3. Tongliao City Housing and Urban-rural Development Bureau Comprehensive Security Center, Tongliao 028000, Inner Mongolia, China)

关键词:

混凝土碳化;  部分碳化区;  CO₂扩散修正模型;  钢筋锈蚀;  弯曲荷载;  碳化深度;  pH值

Keywords:

concrete carbonation;  partial carbonation zone;  CO₂ diffusion correction model;  steel bar corrosion;  bending load;  carbonation depth;  pH value

分类号:

TU528

DOI:

10.19815/j.jace.2024.10009

文献标志码:

A

摘要:

为了解决荷载与碳化共同作用下钢筋的锈蚀问题,首先建立了荷载与碳化共同作用下的CO₂扩散修正模型,然后引入与混凝土内部CO₂浓度相关联的pH模型,阐述了不同碳化时间与荷载水平下混凝土内部pH值的变化规律,并基于pH值划分混凝土的完全碳化区和部分碳化区范围; 最后利用CO₂扩散修正模型预测了混凝土内Ca(OH)₂、CaCO₃的浓度,研究了各物质浓度与部分碳化区深度的对应关系。结果表明:弯曲荷载与碳化共同作用下,随荷载水平增加,受拉区混凝土pH值降低,Ca(OH)₂浓度减小,CaCO₃浓度增加,碳化反应更加充分,部分碳化区深度减小; 混凝土受压区pH值升高,Ca(OH)₂浓度增加,CaCO₃浓度减小,碳化反应速率降低,导致部分碳化区深度增加,促进了部分碳化区的形成; 通过CO₂扩散修正模型计算得出pH值为9时对应的碳化深度与酚酞测试得出的碳化深度几乎相等,而pH值为11.5时所对应的深度远大于酚酞测试得出的碳化深度; 当钢筋处于pH值小于11.5的区域时将发生锈蚀,因此在工程中将酚酞测试值作为钢筋保护层厚度并不可靠,应保证混凝土的保护层厚度大于pH值为11.5所对应的碳化深度值,才更科学安全。

Abstract:

In order to solve the problem of steel bar corrosion under the combined action of load and carbonation, a CO₂ diffusion correction model under the combined action of load and carbonation was first established. Then, a pH model related to the CO₂ concentration inside the concrete was introduced to explain the variation law of pH value inside the concrete under different carbonation time and load levels. Based on the pH value, the complete carbonation zone and partial carbonation zone of concrete were divided. Finally, the concentration of Ca(OH)₂ and CaCO₃ in concrete was predicted using CO₂ diffusion correction model, and the corresponding relationship between the concentration of each substance and the depth of partial carbonation zone was studied. The results show that under the combined action of bending load and carbonation, as the load level increases, the pH value of tensile zone concrete decreases, the concentration of Ca(OH)₂ decreases, the concentration of CaCO₃ increases, the carbonation reaction becomes more complete, and the depth of partial carbonation zone decreases. The pH value of concrete compression zone increases, the concentration of Ca(OH)₂ increases, the concentration of CaCO₃ decreases, and the carbonation reaction rate decreases, resulting in an increase in the depth of partial carbonation zone and promoting the formation of partial carbonation zone. The carbonation depth corresponding to pH value of 9 calculated by the CO₂ diffusion correction model is almost equal to the carbonation depth obtained by phenolphthalein testing, while the depth corresponding to pH value of 11.5 is much greater than the carbonation depth obtained by phenolphthalein testing. When the steel bars are in the area with a pH value less than 11.5, corrosion will occur. Therefore, using phenolphthalein test values as the thickness of steel bar protective layer in engineering is not reliable. It is necessary to ensure that the thickness of concrete protective layer is greater than the carbonation depth value corresponding to pH value of 11.5 in order to be more scientific and safe.

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相似文献/References:

[1]贡金鑫,王振吉,马丽娜,等.沈海高速公路辽宁段沿线桥梁混凝土碳化概率特征研究[J].建筑科学与工程学报,2016,33(05):14.
　GONG Jin-xin,WANG Zhen-ji,MA Li-na,et al.Study on Probability Characteristics of Concrete Carbonation for Bridges of Shenyang-Haikou Highway in Section of Liaoning Province[J].Journal of Architecture and Civil Engineering,2016,33(02):14.

备注/Memo

备注/Memo:

收稿日期:2024-10-06
基金项目:国家自然科学基金项目(12472181,12162025)
作者简介:赵燕茹(1971-),女,工学博士,教授,博士生导师,E-mail:zhaoyanru710523@126.com。
Author resume: ZHAO Yanru(1971-), female, PhD, professor, E-mail: zhaoyanru710523@126.com.

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更新日期/Last Update: 2026-04-01