循环荷载下用高性能水泥基砂浆修复的受腐蚀钢筋混凝土梁的挠曲行为

IF 3 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Structural Concrete Pub Date : 2024-08-28 DOI:10.1002/suco.202400375
Antonio Mudadu, Andrea Prota, Costantino Menna
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引用次数: 0

摘要

了解钢筋混凝土(RC)构件的循环性能对建筑物和基础设施的使用寿命至关重要。钢筋锈蚀在这方面起着重要作用,因为它会严重影响整体结构的完整性,尤其是在循环荷载下,导致结构元件的刚度和承载能力降低。循环条件有可能加速腐蚀引起的开裂和剥落、钢筋和混凝土之间粘结强度的有效性,以及结构的延展性和耗能特性。本研究的主要目的是通过多尺度实验方法,研究高性能触变性修补水泥基砂浆在改善 RC 构件疲劳行为方面的有效性。首先,在混凝土试件的材料尺度上,在增量循环条件下测试了两种不同等级的混凝土以及单组分预混合触变性修补水泥基砂浆。根据从材料尺度获得的结果,四根钢筋混凝土梁暴露在不同程度的加速腐蚀下,采用冲击电流技术,然后通过在拉力侧粘结一层触变性高性能砂浆进行修复。最后,对梁进行了增量循环四点弯曲试验,以研究其在裂纹产生、扩展和能量耗散方面的疲劳行为。由此得出的结构元素的循环特性和开裂行为与加速试验达到的腐蚀水平相关,并证明了结构修复砂浆的有效性。在规范合规性方面,修复砂浆能够满足频繁和准永久组合荷载的要求,保持低于意大利 NTC2018 和欧洲规范规定的所有阈值。
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Flexural behavior of corroded RC beams repaired with high performance cementitious mortar under cyclic loading
The understanding of the cyclic performance of reinforced concrete (RC) elements is of vital importance in relation to the extent of the service life of buildings and infrastructures. Steel rebar corrosion plays a major role in this regard because it significantly affects the overall structural integrity, especially under cyclic loads, leading to reduced stiffness and load‐bearing capacity of structural elements. Cyclic condition has the potential to accelerate the corrosion‐induced cracking and spalling, the effectiveness of the bond strength between rebar and concrete, and also the ductility and energy dissipation characteristics of the structure. The primary objective of this study is to investigate the effectiveness of a high‐performance thixotropic repairing cementitious mortar in improving the fatigue behavior of RC elements through a multiscale experimental approach. First, at the material scale of concrete specimens, two different concrete classes together with the repairing one‐component, pre‐blended, thixotropic cementitious mortar, were tested under incremental cyclic condition. Based on the results obtained from material scale, four reinforced concrete beams were exposed to different levels of accelerated corrosion by means of the impressed current technique and, subsequently, repaired by bonding a layer of the thixotropic high‐performance mortar onto the tension side. Finally, beams were tested under incremental cyclic four‐point bending test to investigate the fatigue behavior in terms of crack onset, propagation and energy dissipation. The resulting cyclic properties and cracking behavior of the structural elements were related to the level of corrosion achieved through the accelerated test and the effectiveness of the structural repair mortar was proven. In terms of code compliance, the repairing mortar was able to fulfill the requirements of frequent and quasi‐permanent combination of loads, remaining below all the threshold values provided by the Italian NTC2018 and Eurocode.
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来源期刊
Structural Concrete
Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
5.60
自引率
15.60%
发文量
284
审稿时长
3 months
期刊介绍: Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.
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