Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Takahashi, Yuya; Tanaka, Yasushi; Maekawa, Koichi

doi:10.3151/jact.16.46

Cited by 20 publications

(12 citation statements)

References 30 publications

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“…Then, the ASR has multiple functions as both self-breaking of concrete and self-curing agents. Figure 18 shows the experiment of RC slab with ASR-induced damage under high cycle fatigue loads [36]. It is found that the life of ASR damaged slabs is prolonged compared to the reference with no initial cracking.…”

Section: Asr and Fatiguementioning

confidence: 99%

Multi-scale and multi-chemo–physics lifecycle evaluation of structural concrete under environmental and mechanical impacts

Wang¹,

Gong²,

Maekawa³

2023

Journal of Intelligent Construction

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Keywordslifecycle evaluation reinforced concrete structures multi-scale modeling multi-chemo-physical analysis coupled deteriorationThis paper presents a multi-scale and multi-chemo-physics platform to evaluate the lifecycle of structural concrete under environmental and mechanical impacts. Following the scheme from nanometer scale of cement hydrated with water molecule to meter scale of reinforced concrete (RC) members, the platform covers characteristic upscaling based on causality and behavioral response toward both environmental and mechanical impacts. During the process, multi-chemo-physics is incorporated to tackle the local equilibrium and global movement, where the associating impact is also considered with mesoscale cracks. With this platform, long-term structural performances are captured while the coupled durability issue is also investigated.

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Section: Asr and Fatiguementioning

confidence: 99%

Multi-scale and multi-chemo–physics lifecycle evaluation of structural concrete under environmental and mechanical impacts

Wang¹,

Gong²,

Maekawa³

2023

Journal of Intelligent Construction

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“…The silica gel generation, migration and the scale-dependent expansion could be simulated by the ASR model. The model has been verified by experiments and used to predict the fatigue life of ASR damaged RC decks (Takahashi et al 2018).…”

Section: Introductionmentioning

confidence: 98%

Restraint Effect of Reinforcing Bar on ASR Expansion and Deterioration Characteristic of the Bond Behavior

Tan

et al. 2020

ACT

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To investigate the restraint effect of reinforcing bar on the expansion induced by alkali-silica reaction (ASR), and assess the mechanical behavior of reinforced concrete (RC) structure damaged by ASR, pullout tests of specimens with different ASR expansion were conducted. Accelerated ASR tests of specimens with diameters of 12 mm, 16 mm, and 20mm were conducted to qualify the restraint effect of reinforcing bar. Pullout tests were used to investigate the relationship between nominal bond strength and ASR expansion. Test results show that ASR expansion decreases with the increase of the rebar diameter. Nominal bond strength of specimens increased initially to attain their peak at 14 days, approximately with the expansion of 0.035%. After that, the nominal bond strength decreased near-linearly with the increment of the expansion. A simplified ASR expansion model integrated with the poro-mechanical model was adopted to analyze the restraint effect. The verification of the proposed method was conducted by comparing the analytically predicted results with the test data. The results show that the proposed method could accurately predict both the ASR expansion and bond strength.

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“…An alkali-aggregate reaction (AAR) is a pathology of degraded concrete. It is a common issue in the concrete structures of nuclear facilities as well as in general civil infrastructure (Hayes et al 2018;Kawabata et al 2018aKawabata et al , 2018bTakahashi et al 2018;Pourbehi and van Zijl 2019;Li et al 2020). In Japan, the reinforced-concrete (RC) turbine generator foundation of the Ikata nuclear power plant (NPP) Unit 1 of Shikoku Electric Power exhibits expansion as a result of AAR, as reported by Manabe et al (2016).…”

Section: Introductionmentioning

confidence: 99%

Benchmark Finite Element Calculations for ASCET Phase III on a Reinforced-Concrete Shear Wall Affected by Alkali-Aggregate Reaction

Kojima¹,

Kodama²,

Jin³

et al. 2021

ACT

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In this study, finite element (FE) analyses were conducted on a reinforced-concrete (RC) shear wall that is affected by an alkali-aggregate reaction (AAR), which were then applied for a benchmark studies in OECD/NEA/CNSI/ASCET (Organization for Economic Co-operation and Development/Nuclear Energy Agency/Committee on Safety of Nuclear Installations/Assessment of Structures subjected to Concrete Pathologies) Phases II and III assessments. A commercial software has been modified to account for this AAR expansion, which is affected by the stress field and change in physical properties of the concrete. The impacts of boundary conditions, modeling in two and three dimensions, and material properties on the load-displacement curve and crack patterns were carefully evaluated. Finally, although similar load-displacement curves and crack patterns were obtained, the peak load due to brittle failure of an RC shear wall affected by AAR could not be reproduced.Consequently, it was found that the rotation of the loading stub and anchoring procedure of the base stub were critical conditions for load-displacement relationship of RC shear wall, and meshing capturing the arrangement of reinforcement bars is crucial for FE analysis with two-dimensional (2D) condition, and finally, the occurrence of initial cracks and the loading capacity could not be clearly reproduced. This suggests that consideration of the placement of rebars and covering concrete in the mash setting in three-dimensional (3D) model affected the failure mode of the concrete. It is necessary to consider the possible failure mechanism and to reflect such features in numerical modeling.

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Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Cited by 20 publications

References 30 publications

Multi-scale and multi-chemo–physics lifecycle evaluation of structural concrete under environmental and mechanical impacts

Multi-scale and multi-chemo–physics lifecycle evaluation of structural concrete under environmental and mechanical impacts

Restraint Effect of Reinforcing Bar on ASR Expansion and Deterioration Characteristic of the Bond Behavior

Benchmark Finite Element Calculations for ASCET Phase III on a Reinforced-Concrete Shear Wall Affected by Alkali-Aggregate Reaction

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