钢纤维再生混凝土劈裂拉伸力学性能与破坏机理  

Splitting Tensile Mechanical Properties and Failure Mechanism of Steel Fiber Recycled Aggregate Concrete

作　　者：孙小飞[1] 吴天乾 余振鹏 潘丽君[1] SUN Xiaofei;WU Tianqian;YU Zhenpeng;PAN Lijun(Nanchang Business College of Jiangxi Agricultural University,Jiujiang 332020,China;School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]江西农业大学南昌商学院,九江332020 [2]上海大学力学与工程科学学院,上海200444

出　　处：《硅酸盐通报》2025年第3期883-891,共9页Bulletin of the Chinese Ceramic Society

基　　金：江西省教育厅科学技术研究项目(209101)。

摘　　要：再生骨料相较于普通骨料具有较低的力学性能、较高的吸水率和孔隙率等特征,由其制成的再生混凝土力学性能较差。本文通过掺入钢纤维和强化再生骨料联合方式,结合数字图像相关技术,应用电液伺服试验机对钢纤维再生混凝土劈裂拉伸力学性能展开试验研究。同时应用细微观测试技术,从界面形态和界面尺度角度揭示钢纤维掺量和强化再生骨料对钢纤维再生混凝土受拉力学性能影响机理。结果表明,当钢纤维掺量较高时,混凝土破坏形态受骨料类型的影响不再显著,含有钢纤维的混凝土劈裂拉伸破坏形态呈现多裂缝和韧性特征。强化再生骨料混凝土抗拉强度相比普通混凝土提高了2.56%~3.50%。强化再生骨料混凝土抗拉强度受钢纤维掺量影响最为显著,最大提高幅度为40.50%;强化再生骨料混凝土和再生混凝土抗裂性能受钢纤维掺量影响显著高于普通混凝土。研究成果可为再生混凝土强化研究与工程应用提供重要理论基础。Compared to normal aggregates,recycled aggregates have lower mechanical properties,higher water absorption and porosity,which result in poorer mechanical properties of recycled aggregate concrete made from recycled aggregates.This article conducted experimental researches on the splitting tensile mechanical properties of steel fiber recycled aggregate concrete by combining steel fiber and consolidate recycled aggregate,combined with digital image correlation technology and electro-hydraulic servo testing machine.Simultaneously,applying microscopic testing techniques,the influence mechanisms of steel fiber content and consolidate recycled aggregate on the tensile properties of steel fiber recycled aggregate concrete were revealed from the perspectives of interface morphology and interface scale.The results indicate that when the content of steel fiber is high,the influence of aggregate type on the failure mode of concrete is no longer significant.The splitting tensile failure mode of concrete containing steel fiber shows multiple cracks and toughness characteristics.The tensile strength of consolidate recycled aggregate concrete increases by 2.56%to 3.50%compared to normal concrete.The tensile strength of consolidate recycled aggregate concrete is most significantly affected by the steel fiber content,with a maximum increase of 40.50%.The crack resistance of both consolidate recycled aggregate concrete and recycled aggregate concrete are more significantly affected by the content of steel fiber than that of normal concrete.The research results can provide important theoretical basis for the strengthening research and engineering application of recycled aggregate concrete.

关 键 词：钢纤维 再生混凝土 强化再生骨料 抗拉强度 微观特征 

分 类 号：TU528.01[建筑科学—建筑技术科学]