Effect of Multi-directional Restraint Induced by Reinforced Steel Bars on ASR Expansion and Bond Performance

Li, Pengfei; Tan, Ni; An, Xuehui; Maekawa, Koichi; Ren, Mingqian

doi:10.3151/jact.20.342

Cited by 8 publications

(6 citation statements)

References 32 publications

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“…The final expansion along the transverse direction for the specimens with stirrups was 0.6 to 0.8%, which was higher than that observed in the specimens without stirrups. Therefore, the threshold for bond performance deterioration due to expansion would be higher in the presence of stirrups, depending on the stirrup ratio, as suggested by Li et al (2022). The reduction of expansion would also contribute to a smaller reduction of concrete strength.…”

Section: Internal Restraint Due To Bonding and Its Degradation By Int...mentioning

confidence: 95%

“…In the presence of stirrups, the DEF expansion is restrained, leading to a reduction in transverse expansion. According to Li et al (2022), the threshold of expansion beyond which bond performance deteriorates is higher in the presence of stirrups and de-pends on the stirrup ratio. The combination of longitudinal steel bars with stirrups induces three-dimensional confinement stresses that help to mitigate both longitudinal and transverse DEF expansions (Fig.…”

Section: Internal Restraint Due To Bonding and Its Degradation By Int...mentioning

confidence: 99%

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Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete

Kawabata,

Miura,

Fujishima

et al. 2023

ACT

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This paper explores the effects of rebar as an internal restraint on the expansion of delayed ettringite formation (DEF) in concrete. Concrete specimens embedded with steel bars without end plates are subjected to heat treatment followed by immersion in water. The effect of stirrups on expansion is also investigated. The results show that the longitudinal expansion of specimens without stirrups differs depending on the longitudinal position, owing to the different degrees of restraint resulting from stress in the steel bar. The final transverse expansions of the specimens without stirrups are close to those measured for stress-free specimens. Conversely, longitudinal and transverse expansions are significantly reduced in the specimens with stirrups. This indicates that the combination of a longitudinal steel bar and stirrups induces threedimensional confinement stresses that help to limit DEF expansion in both the longitudinal and transverse directions. Furthermore, possible debonding along the longitudinal bar is observed in specimens without stirrups when the transverse expansion of the prismatic specimens is 0.4 to 0.6%. This behavior is not observed in the specimens with stirrups, which demonstrates the effectiveness of three-dimensional restraints in significantly mitigating the risk of debonding, as well as DEF expansion.

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Section: Internal Restraint Due To Bonding and Its Degradation By Int...mentioning

confidence: 95%

Section: Internal Restraint Due To Bonding and Its Degradation By Int...mentioning

confidence: 99%

Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete

Kawabata,

Miura,

Fujishima

et al. 2023

ACT

View full text Add to dashboard Cite

show abstract

“…Such time-dependent phenomena can play a dominant role in the prediction of the long-term deformation or displacement changes of structures. Recently, bond behavior has also been discussed (Li et al 2020(Li et al , 2022, which is yet another additional factor to be considered in the structural assessment. Further study on modeling the bond behavior is necessary.…”

Section: What Is Important To Model For the Evaluation Of The Displac...mentioning

confidence: 99%

A Review of Numerical Models for the Performance Assessment of Concrete Structures Affected by Alkali-Silica Reaction

Takahashi,

Miura,

Ueda

et al. 2023

ACT

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This paper reviews numerical studies on the effect of expansion and damage due to alkali-silica reaction (ASR) on the mechanical performance of concrete and reinforced concrete at the structural scale level. Previous research on model development that has focused on the performance of RC members or structures is collected and summarized based on how they operationalize expansion progress. The models can be divided into three categories: models that receive the target expansion amount as an input value, models that use expansion curves, and models that calculate the increase in free expansion by considering the kinetic process of ASR. The aim of the model development can be related to either the deformation of the member or the load capacity for static or dynamic load actions. Expansion transfer under confined conditions is characteristic of the ASR problem, and the methods to model expansion transfer are accordingly summarized. Various considerations concerning the effect of ASR expansion and associated damage on the concrete constitutive laws are also studied. Expansion transfer under multi-axial stress states can be accurately reproduced by the modeling of expansion redistribution and volumetric expansion reduction under stress conditions. There are diverse methods to model the resultant deterioration of mechanical properties, but the primary method is by reducing the strength and elastic modulus according to empirically determined relationships. The ideal modeling approach is still under discussion because the effect of the anisotropic cracking state on the anisotropic mechanical response still requires further study. Finally, current problems of assessment of ASR-damaged concrete structures were discussed, and the significance of the causal correlation between macroscopic expansion behavior and microscale factors was suggested.

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“…This enables the simultaneous calculation of mechanical and environmental loads. Following years of development and application, the finite element program has been extensively studied in the context of load-bearing capacity analysis and durability analysis of RC structures, among other areas [28][29][30][31][32]. Takahashi et al [33] investigated the impact of gel migration on concrete alkali-silica reaction (ASR) expansion using a multiscale pore mechanics calculation method.…”

Section: Introductionmentioning

confidence: 99%

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

Li¹,

Wang²,

Nie³

et al. 2023

Journal of Intelligent Construction

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Keywordsunderground structures reinforced concrete (RC) coupling calculation sensitivity analysis top plate deflection durabilityThe coupling effect of mechanical and environmental loads is the main cause of deterioration in the performance of reinforced concrete (RC) structures. However, most studies on the durability of RC structures have focused only on mechanical or environmental loads. As a result, it is difficult to fully capture the effects of dry shrinkage and creep caused by temperature and humidity changes within the structure, as well as their impact on the overall deformation of the structure. To address this gap, this paper presents a numerical simulation of underground culvert projects using the durability concrete model-complex three-dimensional (DuCOM-COM3D) analysis software. The results of the simulation demonstrate that this approach offers a more precise characterization of the porosity, temperature, and humidity inside the concrete, resulting in improved accuracy in predicting the longterm deflection, crack width, and other macro-mechanical indices of the structure. Despite these advantages, some discrepancies were observed between the calculated and measured long-term deflection values. Additionally, a limit analysis was conducted to investigate the potential causes of the large deformation observed in the measurements. Overall, the results contribute to a better understanding of the complex mechanical and environmental loads affecting RC structures and provide a methodology for accurately simulating their long-term behavior.

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Effect of Multi-directional Restraint Induced by Reinforced Steel Bars on ASR Expansion and Bond Performance

Cited by 8 publications

References 32 publications

Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete

Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete

A Review of Numerical Models for the Performance Assessment of Concrete Structures Affected by Alkali-Silica Reaction

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

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