ASR pessimum behaviour of siliceous limestone aggregates

Garcia-Diaz, E.; Bulteel, D.; Monnin, Y.; Dégrugilliers, P.; Fasseu, P.

doi:10.1016/j.cemconres.2009.08.011

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…Engineers can essentially use the reaction against itself to prevent expansion with pessimum aggregates, and this is an accepted practice in several European countries [82]. However, not all aggregates displaying pessimum behavior will contain sufficient reactive silica to self-mitigate [83]. • Pessimum behavior may lead to false negatives in accelerated laboratory tests such as the AMBT [84].…”

Section: Reactive Aggregate Contentmentioning

confidence: 99%

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Rajabipour

Giannini

Dunant

et al. 2015

Cement and Concrete Research

439

197

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Section: Reactive Aggregate Contentmentioning

confidence: 99%

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Rajabipour

Giannini

Dunant

et al. 2015

Cement and Concrete Research

439

197

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“…0 is the volumetric fraction of new phases leading to little expansion during the reaction for mechanical reasons (migration in porosity [25], [27]- [29], formation in pores too 4 large to induce pressure [14], [22], [30]) or chemical reasons (composition of the phases [31]- [33] or non-expansive surface absorption [34]). It is taken to be proportional to the pressure:…”

Section: Pressure Due To the Formation Of New Phasesmentioning

confidence: 99%

Expansion modelling based on cracking induced by the formation of new phases in concrete

Multon

Sellier

2019

International Journal of Solids and Structures

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Unexpected expansion can be a cause of damage in quasi-brittle materials such as concrete, fired clays or rocks. Such expansions can be due to chemical reactions (alkalisilica reaction-ASR, sulfate attack) or physical phenomena (frost, transport of fluids). Expansion is caused by two main mechanisms: matrix deformation due to the pressure initiated by the formation of new phases in the porosity of the material, and matrix cracking, which increases the apparent swelling of the matrix. In this work, a poromechanical model is proposed to reproduce expansion in materials resulting from single or multiple pressures. In this model, plastic deformation is used to represent permanent strain due to diffuse cracking induced by the pressure. In the case of expansion in quasi-brittle materials, the permanent deformations induced by the pressure are anisotropic to take account of the impact of the initial material anisotropy and stress anisotropy on cracking. The model is then coupled with a damage model and used to evaluate the opening of localized cracks due to a pressure gradient in a laboratory specimen.

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“…This phenomenon can 326 also be described as a non-expansive surface absorption of alkali by reactive silica at 327 the beginning of the processes [54]. 328…”

Section: Pressure In Asr-gels 292mentioning

confidence: 99%

Multi-scale analysis of alkali–silica reaction (ASR): Impact of alkali leaching on scale effects affecting expansion tests

Multon

Sellier

2016

Cement and Concrete Research

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To cite this version:Stéphane Multon, Alain Sellier. Multi-scale analysis of alkali-silica reaction (ASR): Impact of alkali leaching on scale effects affecting expansion tests. Cement and Concrete Research, Elsevier, 2016, 81, pp.122 -133. 10 water and its dependence on temperature, etc.). An important consequence is the 13 difficulty of using the expansion test on specimens to analyse the behaviour of ASR-14 damaged structures. The paper focuses on the influence of leaching: alkali transport 15 and consumption are modelled using a multi-scale approach (aggregate and concrete 16 scales). The evaluation of the alkali concentration below which expansion stops is 17 needed to perform relevant analysis in various alkali conditions and this alkali 18 threshold is quantified according to calcium concentration and temperature. The 19 impact of the coupling between alkali transport in aggregate and silica reactivity is 20 also studied. Lastly, the consequences of leaching on ASR-expansion are analysed in 21 two case studies drawn from the literature. 22

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ASR pessimum behaviour of siliceous limestone aggregates

Cited by 20 publications

References 9 publications

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Alkali–silica reaction: Current understanding of the reaction mechanisms and the knowledge gaps

Expansion modelling based on cracking induced by the formation of new phases in concrete

Multi-scale analysis of alkali–silica reaction (ASR): Impact of alkali leaching on scale effects affecting expansion tests

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