粗骨料对超高性能混凝土中钢筋黏结性能的影响

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中文摘要：含粗骨料的超高性能混凝土(ultra-high performance concrete-coarse aggregate,UHPC-CA)拥有低成本、低收缩的优势,且适用于常温养护的现浇工程,因而具有广阔的应用前景.基于此,聚焦于UHPC-CA中的钢筋拉拔性能,开展了钢筋拉拔试验研究,分析了试件的黏结应力-滑移曲线,并系统性地探讨了粗骨料粒径、掺量以及钢纤维掺量三者如何协同作用于UHPC-CA中的钢筋黏结性能.研究发现:所有钢筋拉拔试件均呈现劈裂破坏的特征,揭示了UHPC-CA在特定条件下的力学行为特性.值得注意的是,粗骨料粒径、掺量以及钢纤维掺量对钢筋黏结性能的影响并非简单线性递增,而是存在一个最优区间,使得UHPC-CA的钢筋黏结性能达到最大化;当粗骨料粒径为5～8 mm、掺量为20%,且钢纤维掺量为2%时能够配制出具有最佳钢筋黏结性能的UHPC-CA,这一发现为实际工程应用提供了重要的参考依据.

外文标题：Influence of coarse aggregates on bonding performance of steel reinforcements in ultra-high performance concrete

外文摘要：Ultra-high performance concrete-coarse aggregate(UHPC-CA)has broad application prospects due to its low cost and low shrinkage characteristics,and it can be used in cast-in-place engineering for room-temperature maintenance.On this basis,the tensile performance of steel reinforcements in UHPC-CA was analyzed,and tensile tests were conducted.The bond stress-slip curves of the specimens were analyzed,and the synergistic effects of particle size and content of coarse aggregates and steel fiber content on the bonding performance of steel reinforcements in UHPC-CA were systematically discussed.The results show that all tensile specimens exhibit splitting failure,revealing the mechanical behavior of UHPC-CA under certain conditions.It is worth noting that the influence of particle size and content of coarse aggregates and steel fiber content on the bonding performance of steel reinforcements is not linearly increasing,but there is an optimal interval,which can maximize the bonding performance of steel reinforcements in UHPC-CA.When the particle size and content of coarse aggregates are 5-8 mm and 20%,and the steel fiber content is 2%,UHPC-CA with optimal bonding performance of steel reinforcements can be prepared,providing an important reference for practical engineering applications.

外文关键词：

ultra-high performance concretecoarse aggregatesteel fibercompressive strengthbond stress-slip curvebonding strength

作者：

杨洋、肖博文、李洪舟、张靖航、邹有宝、黄敦文、彭晖

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作者单位：

达濠市政建设有限公司,广东汕头 515041

长沙理工大学土木工程学院,湖南长沙 410114

关键词：

超高性能混凝土粗骨料钢纤维抗压强度黏结应力-滑移曲线黏结强度

基金：

国家自然科学基金项目国家自然科学基金项目湖南省自然科学基金项目湖南省教育厅科研项目交通基础设施安全风险管理交通运输行业重点实验室(长沙)开放基金资助项目

项目编号：

52178186520080362021JJ4058122B034422KF02

出版年：

2024

DOI：

10.16544/j.cnki.cn43-1494/u.202405272024101990

交通科学与工程

长沙理工大学

交通科学与工程

影响因子：0.444

ISSN：1674-599X

年,卷(期)：2024.40(5)

参考文献量5