Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part II: Bond Performance of Reinforced Concrete Affected by DEF Expansion

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2023-11-18 DOI:10.3151/jact.21.869
Taito Miura, Misato Fujishima, Yuichiro Kawabata, Stéphane Multon, Renaud-Pierre Martin, Naoshi Ueda, Yuya Takahashi, Shingo Asamoto, Jean-Francois Seignol
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Abstract

The purpose of this study is to clarify the bond behavior between rebar and concrete during DEF expansion and pullout testing. The details of the expansion test and the influence of reinforcing bar on DEF expansion have been precisely described in Part I. In Part II, the data related to the bond test is described. The change in bond behavior due to DEF expansion is investigated via the one-end pullout test and the influence of DEF expansion on the bond behavior is discussed. The local bond behavior (slip and bond stress) during the pullout test of the specimens without stirrups is observed to be dramatically changed by DEF expansion. Regarding the specimens with stirrups, failure did not occur during the pullout test and the local bond behavior slightly changed as in the case without stirrups. From the experimental results, a conceptual diagram is proposed to explain the bond behavior during DEF expansion and the pullout test based on the general conceptual understanding of the bond. It can be considered that the direction of local slip and local bond stress during the pullout test is opposite to that during the expansion process. This results in the observed complex local bond behavior during DEF expansion and the pullout test and the effect of stirrups on DEF expansion.

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延后钙矾石沿粘结长度形成对钢筋膨胀的影响——第二部分:DEF膨胀对钢筋混凝土粘结性能的影响
本研究的目的是澄清钢筋与混凝土在DEF膨胀和拉拔试验中的粘结行为。膨胀试验的细节和钢筋对DEF膨胀的影响已经在第一部分中进行了详细的描述。在第二部分中,描述了粘结试验的相关数据。通过一端拉拔试验研究了DEF膨胀对键行为的影响,并讨论了DEF膨胀对键行为的影响。无马镫试件拉拔过程中的局部粘结行为(滑移和粘结应力)因DEF膨胀而发生显著变化。对于有马镫的试件,在拉拔试验中没有发生破坏,局部粘结行为与没有马镫的情况略有变化。根据实验结果,在对键的一般概念理解的基础上,提出了一个概念图来解释DEF展开和拔出试验过程中的键行为。可以认为拉拔试验时的局部滑移和局部粘结应力方向与膨胀过程相反。这导致在DEF膨胀和拉拔试验中观察到复杂的局部键行为,以及马镫对DEF膨胀的影响。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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