超细复合矿粉改性混凝土性能影响分析

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关键词：超细复合矿粉；混凝土；强度；氯盐环境；腐蚀性

中图分类号：TU528.04 文献标志码：A 文章编号：1005-8249（2025）06-0018-06

Abstract：Toimprove theresistanceof traditional concrete tochloridesaltcorosion，ultrafinecomposite mineral powderwas prepared by mixing fly ash，blast furnace slag powder，and steel slag powder in a mass ratio of 2：5：3 .The influence of diferentultrafinecompositemineral powdersreplacingcementontheworkability，mechanical strength，andresistanceto chloridesaltcorosionofconcretewasanalyzed.Theresultsshowedthattheslumpincreasedwiththeincreaseof ultrafine composite mineral powder dosage，andthe 6O minute slump lossdecreased withthe increaseofdosage；Thecompressiveand flexuralstrengthshowatrendoffirstincreasingandthen decreasing withtheincreaseof ultrafinecompositemineral powder content，and the optimal content is 40% ；The diffusion coefficient of chloride ions decreases with the increase of ultrafine composite mineral powder content，and the decrease is no longer significant after the content exceeds 40% ；As the chloride corrosin cycle increases，the masslossrate increasesand therelative dynamic elastic modulus decreases.Theuseof ultrafine composite mineralpowder insteadofcementcanimprovetheconcrete’sresistance tochloridecorosion，withthestrongest resistance at a dosage of 40% .The research results can improve the mix design of chloride resistant concrete and provide reference for the engineering application of waste mineral materials.

Key words：ultra fine composite mineral powder;；concrete；strength；chloride environment；corrosion resistance

0 引言

我国国土面积幅员辽阔，不同自然环境条件下对混凝土结构的耐久性要求不同，其中，抗氯盐腐蚀性能是混凝土结构耐久性能的重要指标之一。（剩余6949字）