The current state of the accelerated concrete prism test

Ideker, Jason H.; East, B.; Folliard, Kevin J.; Thomas, M D; Fournier, Benoît

doi:10.1016/j.cemconres.2009.08.030

Cited by 60 publications

(42 citation statements)

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“…They further demonstrated that some of these alkalis were tied up in the alkali-silica reaction products. Work by Ideker and coworkers [98] also showed that alkali release from the so-called "nonreactive" natural granitic fine aggregate fraction of a concrete mixture in the concrete prism test (CPT) could contribute alkalis to the pore solution in the 38°C (standard) version of the test and in a nonstandard accelerated version run at 60°C. This granitic sand and seven other fine aggregates in the study, were classified as non-reactive based on a 14-day expansion of less than 0.10% in ASTM C1260 (AMBT) [60] testing.…”

Section: Alkali Contribution By Aggregatesmentioning

confidence: 96%

“…It has been suggested [98] that alkali release from non-reactive aggregates can be large enough to influence the concrete prism test (CPT, ASTM C1293 [61]) results. Field studies [94,99] of dams have found cases where the total concrete alkalis measured by hot-water extraction exceeded the estimated alkali contribution by portland cement, in many cases by more than 1.0 kg/m 3 of concrete (or approximately 0.25 to 0.30% Na 2 O eq by mass of cement, assuming concrete with a typical cement content).…”

Section: Alkali Contribution By Aggregatesmentioning

confidence: 99%

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

Rajabipour

Giannini

Dunant

et al. 2015

Cement and Concrete Research

Self Cite

437

197

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Section: Alkali Contribution By Aggregatesmentioning

confidence: 96%

Section: Alkali Contribution By Aggregatesmentioning

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

Self Cite

437

197

View full text Add to dashboard Cite

“…Findings on the influence of temperature on the extent of leaching differ. While some researchers report a clear effect [25], others did not find leaching of alkali to depend significantly on temperature [26]. However, temperature influences the composition of the pore solution, more precisely solubilities of the substances involved, which again affect the reaction mechanism.…”

Section: Influencing Factors During Testingmentioning

confidence: 99%

Continuous expansion measurement in accelerated concrete prism testing for verifying ASR-expansion models

et al. 2018

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The susceptibility of concrete structures due to alkali-silica reaction (ASR) can be assessed by means of ASR concrete prism testing at 60°C, according to RILEM AAR 4.1. There, expansion of concrete prisms indicates alkali-reactivity of the examined concrete mix. This work applies in situ expansion measurement to accelerated concrete prism testing. Automated measuring facilitates both storage without the usually necessary interruptions for manual measurement and acquisition of quasi-continuous expansion data. A comparative experimental programme showed that conventional testing resulted in stronger expansion and leaching of alkalis than automated testing. Experimental simulation of interruptions, typically associated with manual measurements in conventional testing, could prove the influence of these cooling-heating cycles. Two phenomenological approaches, frequently used for describing reaction kinetics of ASR by linking it to expansion results from ASR-testing, were validated with continuous expansion data of three types of aggregate. Experimental expansion depicted s-shaped curves similar to them of the modelling approaches. However, strong swelling recorded in the beginning of the test was not covered by the model curves. Auxiliary measurement of acoustic emissions and ultrasonic velocity helped characterising mechanisms such as hydration and cracking, which also influence prism expansion. The proposed modification of the measurement procedure provides an extended basis to analyse expansion mechanisms. Regarding data for validation of ASR-expansion models, continuous expansion results are preferable to conventional test results.

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“…Sadece agregayı test eden yöntemlere kıyasla beton karışımın teste tabi tutulması daha güvenilir olup numunelerin 38°C'de, kapalı kapların içinde ve su üzerinde saklanmasını öngören BPD sahada oluşabilecek genleşmeleri en iyi yansıtan yöntem olarak düşünülmektedir. Fakat BPD, agreganın reaktivitesini ölçmek için uygulandığında bir yıl ve mineral katkıların genleşmeyi önlemedeki etkinliğini ölçmek için uygulandığında iki yıl sürmektedir [10]. Hızlandırılmış beton prizma deneyi (HBPD) Ranc ve Debray tarafından 2002'de [11] geliştirilmiş olup sıcaklık seviyesi 38°C'den 60°C'ye çıkartılarak gerçek saha karışımlarının performansı incelenmiştir.…”

Section: Introductionunclassified

Bazalt ve Atık Cam Agregalı Betonlarda Alkali-Silis Reaksiyonu Genleşmeleri ve Alkali Sızıntısı Seviyeleri

Yüksel¹,

Mardani‐Aghabaglou²,

Beglarigale³

et al. 2017

Teknik Dergi

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Agregada bulunan amorf silis ve boşluk çözeltisindeki alkaliler arasında gerçekleşen alkalisilis reaksiyonu (ASR), hasarla sonuçlanan önemli durabilite sorunlarındandır. Bu çalışmada, çeşitli karışımların alkali-silis reaktiviteleri, RILEM komitesi tarafından geliştirilen AAR-3 ve AAR-4 deneyleriyle araştırılmıştır. Bu hızlandırılmış deneylerde numunelerde yer alan alkalilerin ne kadarının dışarıya sızdığını belirlemek için kapların alt kısmında yer alan sudan örnekler alınmış ve atomik absorpsiyon spektrometrisi ile sodyum ve potasyum iyonlarının konsantrasyonu belirlenmiştir. Sonuçlara göre alkalilerin önemli bir miktarının betonlardan dışarıya sızabildiği ve buna rağmen, özellikle atık cam agregası içeren karışımlarda halen çok yüksek miktarda genleşme ile karşılaşıldığı görülmüştür.

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The current state of the accelerated concrete prism test

Cited by 60 publications

References 1 publication

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

Continuous expansion measurement in accelerated concrete prism testing for verifying ASR-expansion models

Bazalt ve Atık Cam Agregalı Betonlarda Alkali-Silis Reaksiyonu Genleşmeleri ve Alkali Sızıntısı Seviyeleri

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