Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on concrete porosity, moisture state and transport properties

Lindgård, Jan; Sellevold, Erik J.; Pedersen, Bård; Justnes, Harald; Rønning, Terje F.

doi:10.1016/j.cemconres.2013.05.020

Cited by 64 publications

(42 citation statements)

References 16 publications

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“…A separate paper [8] presents and evaluates the results from measurements of concrete porosity, moisture state and transport properties. In addition to the rate and amount of alkali leaching (Section 2.4 and 3.2) and prism expansion (Section 3.3), this paper includes results from visual inspections and microstructural analysis of prisms after the ASR exposure (Section 2.5.2 and 3.4).…”

Section: Overviewmentioning

confidence: 99%

“…A non-reactive natural gneiss/granitic sand from Årdal and an alkali-silica reactive crushed coarse aggregate, a cataclasite with crypto-to microcrystalline quartz from Ottersbo, were used in all mixtures, blended to produce a 60:40 coarse:fine ratio (by mass) -more details are given in [8]. The 14-day expansion of the sand and the coarse aggregate in the RILEM AAR-2 80°C accelerated mortar bar test [24] was measured to be 0.03 % (non-reactive) and 0.30 % (reactive), respectively (prism size 40x40x160 mm).…”

Section: Parameters Focused On In the Phd Studymentioning

confidence: 99%

“…The alkali content in the cotton wrappings was likewise measured after four weeks of exposure (on the "extra prism" made of each test series -see [8]). The linings and the cotton wrappings were cut in smaller pieces, submerged in 1500 ml of de-ionised water in plastic bottles that was shaken once a day for one week before 20-ml samples were extracted after stirring the solution.…”

Section: Alkali Leaching Measurementsmentioning

confidence: 99%

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Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion

Lindgård

Sellevold

Pedersen

et al. 2013

Cement and Concrete Research

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117

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Section: Overviewmentioning

confidence: 99%

Section: Parameters Focused On In the Phd Studymentioning

confidence: 99%

Section: Alkali Leaching Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion

Lindgård

Sellevold

Pedersen

et al. 2013

Cement and Concrete Research

Self Cite

117

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“…This difference is due to, for example, alkali consumption of the reaction products of ASR [5], different storage conditions (e.g. prestorage sealed or over water, leaching effects, prism sizes, [29,30]), amount of water in contact with solids (solution to solid ratio) etc.…”

Section: Hydrated Cement Paste Powdermentioning

confidence: 99%

Ingress of NaCl in concrete with alkali reactive aggregate: effect on silicon solubility

et al. 2016

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Enhanced damage due to the alkali-silica reaction (ASR) in concrete exposed to deicing salt (NaCl) is usually attributed to binding of chloride ions in the hydration products of cement. To balance charge, OH -ions are released into the concrete pore solution which increases alkalinity. However, during NaCl ingress a decrease in the OH -concentration of the concrete pore solution due to potassium leaching would reduce SiO 2 solubility and therefore ASR damage. The present work combines expansion measurements with pore solution analysis by ICP-OES and XRD measurements on concretes and hydrated cement pastes. Solubility equilibria calculations were performed with the hydrogeochemical simulation program PHREEQC. The investigations show that the OH -concentration of the pore solution is mainly lowered by potassium leaching during NaCl ingress. The OH -concentration also decreases owing to the formation of Friedel's salt from ettringite which is associated with the release of sulphate. Although the OH -concentration with NaCl is lower, ASR damage is intensified and the silicon concentration in the pore solution is higher. Higher silicon solubility is explained by the higher total alkali concentration which increases surface silicate solubility, the formation of an aqueous complex NaHSiO 3 0 and a higher ionic strength. These effects promote the sensitivity of silicate minerals to ASR, the formation of alkali silica gel and finally ASR damage.

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“…Yakın zamanda gerçekleştirilen bir çalışmada [23], bazı beton prizma deneylerinde başvurulan bir yöntem olan numunelerin ıslak kumaşlara sarılması işleminin, özellikle erken yaşlarda betondan dışarıya alkali sızıntısını hızlandırabildiği fark edilmiştir. Dolayısıyla deneysel çalışmada bu tip bir sargılama uygulanmamıştır.…”

Section: Deney Yöntemleri (Rilem Aar-3 Ve Aar-4)unclassified

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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Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on concrete porosity, moisture state and transport properties

Cited by 64 publications

References 16 publications

Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion

Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion

Ingress of NaCl in concrete with alkali reactive aggregate: effect on silicon solubility

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

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