杂散电流作用下混杂纤维混凝土SO42-迁移与反应规律研究

doi:10.11896/cldb.24060080

材料导报

2025, Vol. 39

Issue (18): 24060080-8 https://doi.org/10.11896/cldb.24060080

无机非金属及其复合材料

杂散电流作用下混杂纤维混凝土SO₄^2-迁移与反应规律研究

张路¹, 徐智明¹, 文波^2,*, 牛荻涛², 李辉¹, 梁浩男¹, 嵇智远²

1 西安建筑科技大学材料科学与工程学院,西安 710055
2 西安建筑科技大学土木工程学院,西安 710055

Research on SO₄^2- Migration and Reaction of Hybrid Fiber Concrete Under Stray Current

ZHANG Lu¹, XU Zhiming¹, WEN Bo^2,*, NIU Ditao², LI Hui¹, LIANG Haonan¹, JI Zhiyuan²

1 College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

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摘要为探究杂散电流与硫酸盐共同作用对混杂纤维混凝土耐久性的影响,通过对玄武岩/聚丙烯纤维增强混凝土进行硫酸根离子和腐蚀产物测试,研究其在杂散电流与硫酸盐共同作用下的损伤机理及SO₄^2-迁移与反应规律。结果表明:(1)随着杂散电流密度的增大,混杂纤维混凝土中SO₄^2-浓度也在增大;与1.2 mA/dm²电流密度相比,2.4 mA/dm²和4.8 mA/dm²的杂散电流作用下混凝土的SO₄^2-浓度分别增大了64.5%和133.1%。(2)混杂纤维混凝土抗硫酸盐侵蚀能力排序为NC-30＜BPC-30-0.2＜BC-30-0.1＜PC-30-0.1≈BPC-30-0.1＜BC-40-0.1＜BC-50-0.1。玄武岩和聚丙烯纤维的最佳体积掺量为0.1%,超过限值后存在“负混杂效应”。(3)随着杂散电流搬运OH^-的迁移,纤维混凝土内部pH值降低,Ca(OH)₂含量减小。此外,根据Fick第二扩散定律,提出了杂散电流对SO₄^2-反应量的影响系数,建立了混杂纤维混凝土SO₄^2-扩散系数模型。通过引入纤维影响系数和几何弯曲度系数,建立了杂散电流与硫酸盐共同作用下混杂纤维混凝土的SO₄^2-扩散方程。

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	张路
	徐智明
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	梁浩男
	嵇智远

关键词: 混杂纤维杂散电流损伤机理 SO₄^2-迁移 SO₄^2-反应

Abstract: To explore the effect of stray current and sulfate on the durability of hybrid fiber concrete, the damage mechanism, SO₄^2- migration and reaction rule of basalt/polypropylene fiber reinforced concrete under the action of stray current and sulfate were studied in this work by testing sulfate ions and erosion products. The results show that:(ⅰ) With the increase of stray current density, the SO₄^2- concentration in hybrid fiber concrete also increases. Compared with the SO₄^2- concentration of concrete under the current density of 1.2 mA/dm², the corresponding values of 2.4 mA/dm² and 4.8 mA/dm² increase by 64.5% and 133.1%, respectively. (ⅱ) The sulfate resistances of hybrid fiber concrete specimens can be sequenced as NC-30＜BPC-30-0.2＜BC-30-0.1＜PC-30-0.1≈BPC-30-0.1＜BC-40-0.1＜BC-50-0.1. The optimal content of basalt and polypropylene fiber is 0.1vol%, and the “negative mixing effect” will occur when fiber content exceeds this limit value. (ⅲ) With the migration of OH^- transported by stray current, the internal pH value of concrete decreases and the content of Ca(OH)₂ decreases. Furthermore, according to Fick's second diffusion law, this work tried to propose the influence coefficient of stray current on SO₄^2- reaction quantity, and to establish a SO₄^2- diffusion coefficient model of hybrid fiber concrete. By introducing fiber influence coefficient and geometric bending coefficient, the SO₄^2- diffusion equation of hybrid fiber concrete considering the coupling of stray current and sulfate could be established.

Key words: hybrid fiber stray current damage mechanism SO₄^2- migration SO₄^2- reaction

出版日期: 2025-09-25 发布日期: 2025-09-11

ZTFLH:

TU528

基金资助: 国家自然科学基金(52208203;52378535);中国博士后科学基金(2023MD734209);陕西省重点研发计划项目(2024GH-YBXM-03);陕西省教育厅科研项目(23JP081);陕西省大学生创新创业训练计划(202410703002)

通讯作者: *文波,西安建筑科技大学土木工程学院教授、博士研究生导师。目前主要从事混凝土结构耐久性、混凝土结构抗火性能等方面的研究。wenbo_mail@163.com

作者简介: 张路,西安建筑科技大学材料科学与工程学院讲师、硕士研究生导师。目前主要从事混凝土结构耐久性等方面的研究。

引用本文:

张路, 徐智明, 文波, 牛荻涛, 李辉, 梁浩男, 嵇智远. 杂散电流作用下混杂纤维混凝土SO₄^2-迁移与反应规律研究[J]. 材料导报, 2025, 39(18): 24060080-8.
ZHANG Lu, XU Zhiming, WEN Bo, NIU Ditao, LI Hui, LIANG Haonan, JI Zhiyuan. Research on SO₄^2- Migration and Reaction of Hybrid Fiber Concrete Under Stray Current. Materials Reports, 2025, 39(18): 24060080-8.

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https://www.mater-rep.com/CN/10.11896/cldb.24060080 或 https://www.mater-rep.com/CN/Y2025/V39/I18/24060080

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