基体流变特性对工程水泥基复合材料性能的影响
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中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）04-0019-06
DOI：10.19860/j.cnki.issn1005- 8249.2025.04.004
CHU Shaohui¹，GU Yu2 ，YU Haiyang²，³，CAO Ming4 （1. Hebei Construction Engineering Quality Inspection Center Co.，Ltd.，， Xiong'an O718O0，China; 2.Hebei Academy of Building Research， Shijiazhuang O50227， China； 3. Hebei Province Science and Technology Key Laboratory of Solid Waste for Building Materials， Shijiazhuang O50227，China; 4. Cangzhou Huanghua Port Shipping Engineering Co.， Ltd.， Cangzhou O61113， China）
Abstract：Thetensilestrain-hardeningbehaviorof EngineeredCementitiousComposites（ECC）ishighlydependentonthe uniformdispersionoffibers，with therheological propertiesof thematrix serving asakeyfactor goveming fiberdistribution.By adjusting the water-to-binderratio，superplasticizer dosage，andthickener content，andcombining rheological testing， flowabilitymeasurements，andunaxialtensiletests，thisstudysystematicallyinvestigatesthecorelationmechanismbetwenthe rheological propertiesof theECCmatrixanditsmacroscopicmechanicalperformance.Theresultsindicatethatthematrix
rheologicalbehaviorconforms totheModifiedBingham（M-B）model，anditsshear-thinnngcharacteristicsefectivelyinhibit fiberaglomeration.Asignificantlnearnegativecorelation existsbetweenflowabilityindicatorsand plasticviscosity，validating thefeasibilityof usingflowabilitytests toevaluaterheologicalparameters.Optimaltensilestrain-hardening performance was achieved at a plastic viscosity of 2.5Pas ，yielding an ultimate strain of 3.08% ，with first-crack strength and ultimate strength reaching 3.50 MPa and 4.76MPa ， respectively. Regulating matrix rheological parameters enables uniform fiber dispersion and effective interfacial stress transfer，providing a quantitative design basis for optimizing ECC material performance.
Key words：engineered cementitious composites；plastic viscosity；flow indicators；tensile strain hardening
0 引言
工程水泥基复合材料（EngineeredCementitiousComposites，ECC）因其独特的拉伸应变硬化特性与多缝开裂行为，在土木工程抗震加固与耐久性修复领域具有重要应用价值[1-3]。（剩余5315字）
