Thermo-Chemo-Mechanics of ASR Expansion in Concrete Structures

Ulm, Franz‐Josef; Coussy, Olivier; Li, Kefei; Larive, Catherine

doi:10.1061/(asce)0733-9399(2000)126:3(233)

Cited by 256 publications

(212 citation statements)

References 6 publications

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“…The present work consists of the incorporation of AAR-stress coupling to the uncoupled model firstly proposed by Farage et al (2004) based on Ulm et al (1999), so as to extend its application to structures under more sophisticated loading and boundary conditions.…”

Section: Overview Of Structural Damages Related To Aarmentioning

confidence: 99%

“…The analogue model shown in Figure 1(a), which was adapted by Farage et al (2004) from Ulm et al (1999), represents the solid concrete skeleton and the expansive AAR-gel in parallel. The gel imposes an AAR-induced strain e ch to the system and is considered to behave linearly, as well as the concrete's solid skeleton, whose elasticity is limited by a cohesive joint element characterized by the tensile strength s i .…”

Section: Constitutive Model Of Affected Concretementioning

confidence: 99%

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Modelling of the mechanical behavior of concrete affected by alkali-aggregate reaction

Ferreira

Farage

Barbosa

2013

Rem: Rev. Esc. Minas

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A Reação Álcali-Agregado (RAA) é uma das principais causas de danos químicos em estruturas de concreto, especialmente aquelas expostas à umidade, levando à fissuração, às deformações excessivas e ao aparecimento de tensões. Esse trabalho apresenta os resultados de um estudo numérico através do qual o comportamento mecânico de estruturas atingidas pela RAA é simulado sob a hipótese do acoplamento entre as tensões de confinamento e a reação. Palavras

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Section: Overview Of Structural Damages Related To Aarmentioning

confidence: 99%

Section: Constitutive Model Of Affected Concretementioning

confidence: 99%

Modelling of the mechanical behavior of concrete affected by alkali-aggregate reaction

Ferreira

Farage

Barbosa

2013

Rem: Rev. Esc. Minas

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“…By meaning, in case free stress, the total strain e measurable in such an experiment and neglecting the thermal expansion (Temperature is constant) is thus related through a chemical dilatation coefficient b to the extent n of the ASR as follows (Ulm et al 2000):…”

Section: Discussionmentioning

confidence: 99%

Effect of Combined ASR and Cyclic Loading on Concrete Bridges

Alaud

Zijl

2017

Facing the Challenges in Structural Engineering

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Abstract. Reinforced concrete beams were subjected to the combination of mechanical loading and alkali-silica reaction (ASR) in order to investigate the durability of concrete under their combined action. This experiment used locally-sourced materials such as aggregates and admixtures in order to develop a concrete mix that will give the optimum resistance to such combined action. Half of the specimens were subjected to static, and cyclic loading and exposure to accelerated ASR-inducing environment and the other half were exposed only to an ASR-inducing environment. The test results indicate that the expansion due to the combined action was significantly different from that in specimens exposed only to a high-alkaline environment. The micro and macro cracks induced by cyclic loading form paths leading to an increased ASR rate, while the macro-mechanical cracks provide regions of relatively free expansion, as can be deduced from the decreasing crack widths.

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“…The quantity of water plays a significant role in the solvent for the silica dissolution and is a necessary compound for the formation of gels, precipitates, crystals, etc. (Ulm et al 2000). The dissolved silica may diffuse away from the reactive aggregate particles when elevated by the internal humidity and the subsequent reaction in solution forming amorphous gel or precipitates may then take place anywhere in the concrete (Steffens et al 2003).…”

Section: Time (Weeks)mentioning

confidence: 99%

Combined Action of Mechanical Pre-Cracks and ASR Strain in Concrete

Alaud

Zijl

2017

ACT

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An experimental study was undertaken to investigate aspects of durability of reinforced concrete elements subjected to the combined action of mechanical pre-cracking and alkali-silica reaction (ASR). Concrete beams with a high alkali content were pre-cracked in cyclic loading and subsequently submerged partially in water, or exposed to high humidity according to ASTM C1293-07 conditions (long-term method). Aggregates of relatively high, and aggregates of low reactivity were used. Reference beams with both reactive and less reactive aggregate were placed in the ASR chambers to compare the responses of specimens exposed to the combined action and specimens subjected to the ASR action only. The crack widths were monitored in pre-cracked specimens under both conditions (humidity, partially submerged). The test results indicate that the expansion due to the combined action at the middle of samples (mechanical crack zone) was significantly different in specimens exposed only to a high alkaline environment. The micro and macro cracks, induced by cyclic load, form ingress paths leading to increased ASR rate, while the macro-mechanical cracks provide regions of relatively free expansion, as deduced from decreasing crack widths.

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Thermo-Chemo-Mechanics of ASR Expansion in Concrete Structures

Cited by 256 publications

References 6 publications

Modelling of the mechanical behavior of concrete affected by alkali-aggregate reaction

Modelling of the mechanical behavior of concrete affected by alkali-aggregate reaction

Effect of Combined ASR and Cyclic Loading on Concrete Bridges

Combined Action of Mechanical Pre-Cracks and ASR Strain in Concrete

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