高浓度硫酸盐环境下桥梁桩基混凝土防腐技术

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (4): 1213-1219.

高浓度硫酸盐环境下桥梁桩基混凝土防腐技术

穆松, 郭政, 刘光严, 周莹, 谢德擎, 蔡景顺, 刘凯

江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,南京 211103

收稿日期:2021-01-06 修回日期:2021-02-03 出版日期:2021-04-15 发布日期:2021-05-11
作者简介:穆松(1982—),男,高工。主要从事混凝土耐久性提升技术研究。E-mail:musong@cnjsjk.cn
基金资助:
“十三五”国家重点研发计划(2017YFB0309904);国家自然科学基金:NSF-高铁联合基金(U1934206);江苏省住房与城乡建设厅科技项目(2018JH017)

Anti-Corrosion Techniques of Bridge Pile Foundation Concrete in High-Concentration Sulfate Environment

MU Song, GUO Zheng, LIU Guangyan, ZHOU Ying, XIE Deqing, CAI Jingshun, LIU Kai

State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China

Received:2021-01-06 Revised:2021-02-03 Online:2021-04-15 Published:2021-05-11

摘要/Abstract

摘要： 结合西南某公路桥梁工程桩基混凝土的抗硫酸盐腐蚀需求,研究10%(质量分数)高浓度硫酸盐溶液作用下防腐技术对混凝土抗压强度、抗压强度耐蚀系数及硫酸根离子传输的影响。通过气泡结构和微观形貌分析了防腐技术的作用机理。结果表明,高浓度硫酸盐侵蚀环境下,“膨胀剂+矿物掺和料”类防腐剂防腐效果表现为早期优异后期破坏严重,“盐结晶抑制”类防腐剂长期抗腐蚀效果更优。矿物掺和料、“膨胀剂+矿物掺和料”类防腐剂主要通过提升密实度和优化孔径分布来延缓硫酸根的侵入,而“盐结晶抑制”类防腐剂既可一定程度优化混凝土孔隙结构,又可抑制结晶性膨胀产物的生成。

关键词: 防腐技术, 桥梁工程, 桩基混凝土, 力学性能, 硫酸盐侵蚀, 微结构

Abstract: As the demand for sulfate resistance of pile foundation concrete of a highway bridge in the Southwest of China, the influences of anti-corrosion techniques on concrete compressive strength, corrosion resistance coefficient of compressive strength and sulfate-ion transport under 10% (mass fraction)-sulfate solution were investigated. The mechanism of anti-corrosion techniques was analyzed by air-void structure and micro morphology. The results show that the corrosion resistance of "expansive agent with supplementary cementitious materials" admixtures is excellent in the early stage but serious in the later period, and the corrosion resistance of "salt crystallization inhibition" admixtures is better in the long term. Supplementary cementitious materials and "expansive agent with supplementary cementitious materials" admixtures delay the corrosion of sulfate mainly by improving the compactness and optimizing the pore size distribution, while "salt crystallization inhibition" admixtures not only optimize the pore structure of concrete to a certain extent, but also inhibit the formation of crystalline expansion products.

Key words: anti-corrosion technique, bridge engineering, pile foundation concrete, mechanical property, sulfate attack, microstructure

中图分类号:

TU528

穆松, 郭政, 刘光严, 周莹, 谢德擎, 蔡景顺, 刘凯. 高浓度硫酸盐环境下桥梁桩基混凝土防腐技术[J]. 硅酸盐通报, 2021, 40(4): 1213-1219.

MU Song, GUO Zheng, LIU Guangyan, ZHOU Ying, XIE Deqing, CAI Jingshun, LIU Kai. Anti-Corrosion Techniques of Bridge Pile Foundation Concrete in High-Concentration Sulfate Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1213-1219.

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