Numerical Modelling of ASR Expansions in Concrete

Liaudat, Joaquín; Martínez, Ana María Romero; López, Carlos M.; Carol, Ignacio

doi:10.1061/9780784479346.054

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Kawabata et al 2013;Kawabata and Yamada 2015;Sannoh and Torii 2014;Costa et al 2014). Its modeling has been also studied by leading researchers (Saouma 2014;Saouma et al 2015;Multon et al 2009;Bažant and Steffens 2000;Bangert et al 2004;Liaudat et al 2015;Charpin and Ehrlacher 2014). Multon et al (2006Multon et al ( , 2009 conducted an experiment to detect anisotropic expansion under three-dimensional non-uniform confinement and are also developing an analytical model to consider such an anisotropic expansion of complexity with ASR.…”

Section: Introductionmentioning

confidence: 99%

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Takahashi

Ogawa

Tanaka

et al. 2016

ACT

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This study set out to investigate the effect of gel migration through micro-pores and cracks on concrete expansion caused by alkali-silica reaction (ASR). First, sensitivity analyses with permeation of produced silica gel were conducted by using a computational scheme of multi-scale poro-mechanics. Then, silica gel movements were found to substantially affect the ASR expansion of concrete with the possibility of its scale effect being rooted in the drugging force when the silica gel is in motion. With accelerated ASR tests of mortar, the predicted scale effects were experimentally verified and the permeation of gel was inversely identified in terms of multi-scale mechanics. Here, the effect of alkali ion leaching on the scale-dependency was also discussed in view of chemo-physics as well as mechanics of produced gel migration. The measured characteristic scale-dependency in the experiment can be also simulated by nonlinear analysis of smeared cracks coupled with gel generation, migration and alkali ion leaching.

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Section: Introductionmentioning

confidence: 99%

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Takahashi

Ogawa

Tanaka

et al. 2016

ACT

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“…Bažant and Steffens 2000;Multon and Toutlemonde 2006;Multon et al 2009;Grimal et al 2010;Saouma 2014;Saouma et al 2015;Bangert et al 2004;Liaudat et al 2015). The anisotropic ASR expansion under three dimensional confinement is also investigated (Multon et al 2009) and some models have being applied to structural scale problems (Saouma 2014).…”

Section: Introductionmentioning

confidence: 99%

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

Takahashi

Tanaka

Maekawa

2018

ACT

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To estimate the remaining life of existing RC bridge decks damaged by alkali silica reaction (ASR), multi-scale numerical analysis with chemo-hygral model is integrated with visual inspection data at site. First, the applicability of the poro-mechanical models for ASR expansion in the multi-scale frame are examined with the experiments of the real scale RC slabs and the model is validated to bring about fair prediction of the 3D anisotropic expansion and the fatigue life of the slabs. Second, visually inspected cracks on bottom surfaces of RC decks are converted to space-averaged strains, and the magnitude of ASR is estimated from the vertical deformation, based on which the internal pre-stress and the damage fields are re-produced by numerical predictor-corrector cycles, and the remaining life of ASR damaged RC bridge decks is fairly estimated. By conducting sensitivity analyses in terms of ASR-gel volumes and cracks, allowable error range of site inspection data is clarified to meet the requirement of asset management.

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“…In particular, a set of tests performed with specimens provided with a complete lateral sealing in order to prevent mass exchange (described in detail in Ref. [6]) can be adequately simulated by means 1D models. In this section, preliminary simulation results of these tests obtained with the proposed ASR model are presented.…”

Section: Preliminary Resultsmentioning

confidence: 99%

“…As a result of ASR, local expansions over time are calculated and written in an external file that is later read by a second FE code (DRAC) for the mechanical analysis which interpret them as local pseudothermal expansions, returning the stress-strain state of the material. Previous versions of this model can be found in [4][5][6].…”

Section: Numerical Modelling Of Asrmentioning

confidence: 99%

Numerical and experimental study of ASR in concrete at the meso-level

Liaudat¹,

Garello²,

Carol³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:In this paper, an ongoing research project on the mechanisms of concrete deterioration due to Alkali-Silica Reaction (ASR) is presented, together with some preliminary results. The research program includes both experimental and numerical modelling work.The first part includes the development of two new experimental setups, one devoted to study the ASR expansion mechanisms at the level of a single matrix-aggregate interface and the other to the study of ASR expansions of cubic concrete specimens under triaxial confinement.The second part includes the formulation and numerical implementation of a chemo-mechanical model for ASR expansions in concrete at the meso-level. The model considers three main diffusion/reaction field equations for the concentrations of silicates, calcium and alkalis in concrete pore solution, complemented by a number of chemical kinetics and chemical equilibrium equations. The volume fraction distribution of the solid constituents of the hardened cement paste and the reaction products evolve with the progress of the reaction, determining the diffusivity properties of the material and, eventually, inducing expansions.

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Numerical Modelling of ASR Expansions in Concrete

Cited by 6 publications

References 4 publications

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

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

Numerical and experimental study of ASR in concrete at the meso-level

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