document

Toward identifying the ASR-induced stresses from displacement measurements and crack observations—Demonstration on a beam bridge in Norway

Kongshaug, Simen Sørgaard (author), Hendriks, M.A.N. (author), Kanstad, Terje (author), Markeset, Gro (author)

Alkali–silica reaction (ASR) in concrete causes expansion and degradation of the material, which might give adverse structural consequences. From the structural engineer point view, the greatest concern is if ASR leads to loss of structural integrity. Two natural questions arise when assessing existing concrete structures affected by ASR: (1)...

journal article 2022

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Synthesis of alkali-silica reaction (ASR) products and the role of Al and Li in mitigating ASR

Shi, Zhenguo (author), Lothenbach, Barbara (author)

Using Al-rich supplementary cementitious materials to partially replace Portland cement is a well-established empirical approach to mitigate expansion of concrete caused by alkali-silica reaction (ASR). However, the mechanisms behind it are still not completely understood. Synthesis of ASR products in the laboratory provides a unique opportunity...

conference paper 2021

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Analysis of the porosity of alkali-sensitive aggregates for the assessment of microstructure dependent solubility in the context of ASR

Oesch, Tyler (author), Weise, Frank (author), Marx, Heidi (author), Kositz, Mario (author), Huenger, Klaus-Juergen (author)

Intensified Alkali-Silica Reaction (ASR) damage has occurred on German roadways in recent years, leading to requirements for compulsory pre-construction investigation of aggregate alkali sensitivity using concrete tests with external alkali supply. However, since these tests are time-consuming and cost-intensive, there is interest in replacing...

conference paper 2021

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Multi-phase modelling of multi-species transport in concrete: In case of electrochemical protection for both ASR and chloride attack

Liu, Qing-feng (author), Mao, Li-xuan (author), Hu, Zhi (author)

Existing reinforced concrete structures experience severe durability degradation when subjected to alkali–silica reaction (ASR) and chloride attack. A special electrochemical rehabilitation treatment, containing lithium compound anolyte, has been developed to drive lithium ions into concrete as well as remove chlorides simultaneously, for...

conference paper 2021

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Analytical study about the expansion progress of concrete exposed to combined alkali silica reactions and freezing thawing cycles

Takahashi, Yuya (author), Gong, Fuyuan (author), Maekawa, Koichi (author)

Using numerical simulations, this study investigated the concrete expansion damage caused by the coupled action of freeze-thaw cycles (FTC) and alkali silica reactions (ASR). In the authors’ previous experiments, it was shown that a preceding ASR definitely accelerated the succeeding expansion by FTC. Further, even if the specimens have...

conference paper 2021

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Load effects in reinforced concrete beam bridges affected by alkali–silica reaction—Constitutive modelling including expansion, cracking, creep and crushing

Kongshaug, Simen Sørgaard (author), Larssen, Rolf Magne (author), Hendriks, M.A.N. (author), Kanstad, Terje (author), Markeset, Gro (author)

Material modelling, from the micro to the macro level, of concrete affected by alkali–silica reaction (ASR) has been devoted a lot of research. However, the application of the material models in structural analyses of reinforced concrete (RC) structures, showing the structural implications/consequences of ASR, has got little attention in the...

journal article 2021

document

Effect of reactive aggregate on the early age reaction of water-glass activated slag/fly ash mortars

Wang, Wei (author), Zhang, Shizhe (author), Ye, G. (author), Noguchi, Takafumi (author)

Alkali activated materials (AAMs) have received worldwide attention due to its lower embodied energy and environmental impact than that of traditional cementitious materials. However, the activators with high alkalinity may raise the risk of alkali silica reaction (ASR) induced deterioration when reactive aggregates are used, which thereby...

conference paper 2021

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Experimental investigation of ASR-affected concrete – The influence of uniaxial loading on the evolution of mechanical properties, expansion and damage indices

Kongshaug, Simen Sørgaard (author), Oseland, Oddbjørn (author), Kanstad, Terje (author), Hendriks, M.A.N. (author), Rodum, Eva (author), Markeset, Gro (author)

The alkali silica reaction (ASR) in concrete causes internal localized swelling and micro cracking, which result in expansion and correlated deterioration of the concrete material. The stress state of the concrete is known to affect expansion due to ASR, with an anisotropic stress state giving rise to anisotropic expansion. Similarly, the...

journal article 2020

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The influence of the anolyte solution type and concentration on lithium migration in mortar specimens

Silva de Souza, L.M. (author), Polder, R.B. (author), Copuroglu, Oguzhan (author)

Electrochemical lithium migration has been suggested as repair technique for alkali-silica reaction affected concrete structure. In this method, an electric field is used to transport lithium into the material. Current studies have used anolyte solutions with various lithium salts at different concentrations. However, little has been said on...

journal article 2018

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Alkali silica reaction in the afsluitdijk: Assessment of concrete damage and remaining service life using experimental and modelling research

Kamat, Ameya (author)

Alkali Silica Reaction (ASR) is one of the degradation mechanisms in concrete that poses a threat to the service life of existing structures. This physio-chemical process is progressive and can affect the the strength, stiffness and stability of concrete structures. A lot of mitigation measures are available to prevent the deleterious effects of...

master thesis 2017

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Literature review of modelling approaches for ASR in concrete: a new perspective

Esposito, R. (author), Hendriks, M.A.N. (author)

The assessment of concrete structures affected by alkali–silica reaction (ASR) is a complex problem due to the multiscale nature of this long-term phenomenon. The reaction starts within the concrete constituents and developed at aggregate level by inducing swelling and deterioration of concrete material, which eventually affect the capacity of...

journal article 2017

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The effect of an embedded cathode on lithium migration in mortar specimens

Souza, Lourdes M.S. (author), Polder, R.B. (author), Copuroglu, Oguzhan (author)

The currently available treatment techniques for concrete structures affected by alkali-silica reaction (ASR) are limited and electrochemical lithium migration has been proposed as an alternative. Lithium compounds have shown to have beneficial effects on ASR expansion when used as admixtures to fresh concrete. During the electrochemical...

journal article 2017

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Electrochemical lithium migration to mitigate alkali-silica reaction in existing concrete structures

Silva de Souza, L.M. (author)

Alkali-silica reaction (ASR) is a deterioration process that affects the durability of concrete structures worldwide. During the reaction, hydroxyl and alkali ions present in the pore solution react with reactive silica from the aggregate, forming a hygroscopic ASR gel. Alternatively, the silica structure is attacked by hydroxyl ions and the...

doctoral thesis 2016

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Elastic modulus of the alkali-silica reaction rim in a simplified calcium-alkali-silicate system determined by nano-indentation

Zheng, Kunpeng (author), Lukovic, M. (author), de Schutter, Geert (author), Ye, G. (author), Taerwe, Luc (author)

This work aims at providing a better understanding of the mechanical properties of the reaction rim in the alkali-silica reaction. The elastic modulus of the calcium alkali silicate constituting the reaction rim, which is formed at the interface between alkali silicate and Ca(OH)2 in a chemically-idealized system of the alkali-silica reaction...

journal article 2016

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Studies on the alkali-silica reaction rim in a simplified calcium-alkali-silicate system

Zheng, Kunpeng (author), Adriaensens, Peter (author), De Schutter, Geert (author), Ye, G. (author), Taerwe, Luc (author)

This work is intended to provide a better understanding about the properties and roles of the reaction rim in an alkali-silica reaction. A simplified calcium-alkali-silicate system was created to simulate the multiple interactions among reactive silica, alkaline solution and portlandite near the aggregate surface during the formation and...

journal article 2016

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A multiscale micromechanical approach to model the deteriorating impact of alkali-silica reaction on concrete

Esposito, R. (author), Hendriks, M.A.N. (author)

The alkali-silica reaction (ASR) in concrete is one of the most harmful deterioration processes, which leads to expansion and cracking of the material. To understand the evolution of ASR in concrete and its deteriorating impact on the material, a multiscale material model, from aggregate to concrete level, is proposed. The concrete, which at...

journal article 2016

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The Deteriorating Impact of Alkali-Silica Reaction on Concrete: Expansion and Mechanical Properties

Esposito, R. (author)

The assessment of concrete structures affected by alkali-silica reaction (ASR) is a complex problem due to the multiscale nature of this long-term phenomenon. The reaction starts within the concrete constituents with the formation of an expansive alkali-silica gel at reaction products level. Being the expansive gel confined within the concrete...

doctoral thesis 2016

document

Influence of the alkali-silica reaction on the mechanical degradation of concrete

Esposito, R. (author), Anac, C. (author), Hendriks, M.A.N. (author), Copuroglu, Oguzhan (author)

The alkali-silica reaction (ASR) is an important problem that has yet to be completely understood. Owing to the complexity of this<br/>phenomenon, a number of studies have been conducted to characterize its kinetics, its impact on the material, and its structural consequences.<br/>This paper focuses on the deteriorating impact of ASR on concrete...

journal article 2016

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Ageing effects of alkali-silica reaction in concrete structures

Esposito, R. (author), Hendriks, M.A.N. (author)

The alkali-silica reaction (ASR) is a long-term deterioration process, which produces a hydrophilic and expansive gel causing damage. The ASR acts on concrete as an ageing phenomenon, modifying the material on the basis of its stress state. Focussing on the mechanical degradation of concrete, estimated trends for the mechanical properties in...

conference paper 2016

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Measuring and modelling the deteriorating impact of Alkali-Silica Reaction in concrete on the mechanical characteristics

Esposito, R. (author), Hendriks, M.A.N. (author)

Unaffected and ASR-affected concrete, experimentally, appear as substantially different materials. Since the material characterization is one of the main points of attention within a structural assessment, the deteriorating impact of ASR on concrete in terms of both expansion and degradation of the mechanical properties is studied. Both...

book chapter 2015