地铁复杂环境下的现浇混凝土腐蚀劣化探讨

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中图分类号：TQ178 文献标志码：A文章编号：1001-5922（2025）12-0165-05

Discussion on corrosion deterioration of cast-in-place concrete in complex environment of subway

ZHENG Zhicheng （POWERCHINA Railway Construction Investment Group Co.，Ltd.，Beijing 10o060，China）

Abstract：Inorder to explore thecorrosionresistanceand durabilityofcast-in-place concrete in the complex environmentof subway，this study systematically analyzed the influence of diffrent fibercontentonthe working performance，mechanical propertiesand corrosionresistance ofcast-in-place concrete bysimulating the composite salt erosion conditions through laboratory tests.The concrete of C4O strength grade was designed in the experiment，and 3.5% sodium chloride was added as the internal corrosion source，and four kinds of basalt fiber volume contents of 0%，0.15%，0.35% and 0.55% were set. The performance was comprehensively evaluated by slump test，compressive strength，flexural strength，volume expansionrateand masschangerate.Theresultsshow that the incorporation ofbasalt fibersignificantlyimproves thecompressveandflexural strengthofconcrete.Especiallyinthesulfateerosion environment，the specimen with 0.35% fiber content has the best performance，and its 28-day compressive strength reaches 48.99 MPa and flexural strength reaches 11.14 MPa，which are higher than the reference group.In addition，the addition offibers effectively inhibited the volume expansion and mass changecaused bysulfate.The volume expansion rate of the specimen with 0.35% content in 10% N 12 SO 4 solution was only 0.003 % ，and the mass changerate was thelowest，indicating that itscorrosionresistance was outstanding.However，excessive fiber will lead toa sharp decline in thefluidityof concrete，and the improvement of mechanical properties is limited.On the whole，basalt fiber reinforced concrete has excellent durabilityunder the condition of compound salt erosion，and 0.35% is the best dosage，whichcan provide an important reference for the anti-corrosion design of cast-in-place concrete structure in subway engineering.

Key words： basalt fiber;cast-in-place concrete;composite salt erosion;durability;mechanical properties

随着城市化进程的加速，地铁作为现代城市交通的重要组成部分，其建设规模和运营里程逐年增长。（剩余6128字）