Reliable quantification of AAR damage through assessment of the Damage Rating Index (DRI)

Sanchez, Leandro; Fournier, Benoît; Jolin, Marc; Duchesne, Josée

doi:10.1016/j.cemconres.2014.08.002

Cited by 120 publications

(46 citation statements)

References 15 publications

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“…expansion level) Tools for assessing damage in concrete affected by AAR coming from fine and coarse aggregates of AAR, whatever is the reactive aggregate type (fine vs. coarse) and concrete strength (25, 35 and 45 MPa), as illustrated in Figure 6. Overall, two interesting distress patterns can be seen as a function of ASR expansion: 1) all the mixtures showed the presence of Closed cracks within the aggregate particles (CCA -blue sections), which is likely due to weathering of the aggregates and crushing procedures as proposed by Sanchez et al [4]. This feature was even more evident in Tx mixtures, mainly in the non-reactive HP coarse aggregate particles, since HP is a limestone and presents both lower stiffness and hardness compared to NM aggregate.…”

Section: Dri Damage Assessmentmentioning

confidence: 99%

“…According to [4], the DRI is able to evaluate either the distress characteristics or the distress development (i.e. expansion level) Tools for assessing damage in concrete affected by AAR coming from fine and coarse aggregates of AAR, whatever is the reactive aggregate type (fine vs. coarse) and concrete strength (25, 35 and 45 MPa), as illustrated in Figure 6.…”

Section: Dri Damage Assessmentmentioning

confidence: 99%

“…A) DRI stereomicroscope; B) 1 cm² grid drawn on a polished concrete specimen;C) DRI weighing factors proposed as by [11]; D) ≠ petrographic features to be noted through a DRI evaluation [4] Cracks with reaction product in cement paste CCPG 3…”

Section: Figurementioning

confidence: 99%

“…Counts of cracking in the aggregate particles were made in particles down to 1 mm in size, instead of 2 mm normally used in the original method [4]. The latest weighing factors proposed by Villeneuve et al [11] were used for the calculation of the DRI output values ( Figure 4C).…”

Section: Damage Rating Index (Dri)mentioning

confidence: 99%

“…The number of counts corresponding to each type of petrographic features ( Figure 4C) is then multiplied by weighing factors, whose purpose is to balance their relative importance towards the mechanism of distress (for instance ASR) ( Figure 4D) [4]. It is important to mention that the factors used in the method were chosen on a logical basis, but relatively arbitrarily [11].…”

Section: Damage Rating Index (Dri)mentioning

confidence: 99%

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Tools for assessing damage in concrete affected by AAR coming from fine and coarse aggregates

Sanchez

Fournier

Jolin

et al. 2017

Rev. IBRACON Estrut. Mater.

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Tools for assessing damage in concrete affected by AAR coming from fine and coarse aggregatesTécnicas para a avaliação da deterioração proveniente da reação álcali-agregado (RAA) gerada pela presença de agregados reativos graúdos e miúdos Abstract ResumoOver the last few years, comprehensive management programs for the diagnosis and prognosis of alkali-aggregate reaction (AAR) in aging concrete structures were developed in North America, based on a series of laboratory test procedures. Although promising, these lab-procedures presented several parameters whose impacts were not completely understood, which significantly reduced their applicability for the appraisal of deteriorated concrete structures in service. In this context, it has been suggested that two lab-tools, the Stiff ness Damage Test (SDT) and the Damage Rating Index (DRI) could reliably assess the condition of concrete affected by AAR. This paper presents the condition assessment of 25, 35 and 45 MPa AAR affected concrete specimens incorporating fi ne and coarse reactive aggregates and presenting different distress degrees (i.e. expansion levels from 0.05 to 0.30%) through the use of an innovative multi-level approach. Results show that both SDT and DRI are suitable for assessing damage in AAR affected concrete through their output parameters. Yet, they present a complementary character, which illustrates the need for a multi-level approach.Keywords: stiff ness damage test, damage rating index, condition assessment, multi-level approach, alkali-aggregate reaction (AAR).Nos últimos anos, diversos programas de gestão para o diagnóstico e prognóstico da reação álcali-agregado (RAA) em estruturas de concreto foram desenvolvidos na América do Norte, com base em uma série de procedimentos experimentais em laboratório. Apesar de promissores, esses procedimentos apresentaram uma série de parâmetros cujo impacto não foi amplamente avaliado e discutido, o que reduziu significativamente a utilização destas técnicas na avaliação de estruturas de concreto deterioradas em serviço. Neste contexto, sugere-se que duas técnicas laboratoriais, o ensaio de Deterioração de Rigidez (SDT) assim como a avaliação microscópica do Índice de Deterioração (DRI) destacam-se como ensaios capazes de avaliar de maneira confiável e precisa o estado de deterioração do concreto afetado pela RAA. Este trabalho apresenta a utilização dos métodos descritos acima na avaliação da deterioração de differentes concretos (25, 35 e 45 MPa) afetados pela RAA, incorporando agregados reativos graúdos e miúdos e apresentando diferentes níveis de expansão (0,05 à 0,30%). Os resultados demonstram que tanto o SDT como o DRI são adequados para avaliar o nível de deterioração do concreto afetado pela RAA. Entretanto, estes apresentam um caráter complementar, o que ilustra a necessidade de uma abordagem "multinível" quando da utilização dos mesmos na avaliação de estruturas em serviço.Palavras-chave: Deterioração de Rigidez (SDT), Índice de Deterioração (DRI), avaliação do estado de deterioração, avaliaç...

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Section: Dri Damage Assessmentmentioning

confidence: 99%

Section: Dri Damage Assessmentmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Damage Rating Index (Dri)mentioning

confidence: 99%

Section: Damage Rating Index (Dri)mentioning

confidence: 99%

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