Alkali‐silica reaction performance testing of concrete considering external alkalis and preexisting microcracks

Giebson, Colin; Voland, Katja; Ludwig, Horst‐Michael; Meng, Birgit

doi:10.1002/suco.201600173

Cited by 17 publications

(18 citation statements)

References 12 publications

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“…Alkali silica reaction (ASR) is an important durability issue of concrete produced using reactive aggregates. The reaction of reactive siliceous aggregate with the alkali present in binder leads to formation of an expansive gel and imparts swelling pressure that may cause cracking and strength loss of concrete structures . Stanton first identified this deleterious expansion in concrete.…”

Section: Introductionmentioning

confidence: 99%

Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Saha

Sarker

2018

Structural Concrete

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This study investigates the potential alkali silica reaction (ASR) of ferronickel slag (FNS) aggregate, which is a by‐product of nickel production. A class F fly ash was used as a possible ASR mitigation in accelerated mortar bar test (AMBT) specimens containing 50% FNS. There were visible surface cracks on the specimens using no fly ash or 10% fly ash. Use of 20% fly ash reduced expansion by 45% as compared to that with 10% fly ash. In accordance with the expansion limits of Australian Standard, the mixtures using 20 and 30% fly ash were categorized as slowly reactive and nonreactive, respectively. Thermogravimetric analysis (TGA) and microstructural observations confirmed the effectiveness of fly ash in reducing Portlandite content that reduced the ASR expansion. Therefore, the use of 20–30% fly ash as cement replacement is considered as an adequate ASR mitigating measure of FNS fine aggregate.

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Section: Introductionmentioning

confidence: 99%

Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Saha

Sarker

2018

Structural Concrete

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“…A possible explanation for this phenomenon is given by the increased sodium penetration in the pre‐damaged specimens. It is shown more in detail in Reference .…”

Section: Resultsmentioning

confidence: 99%

“…Results of climate simulation concrete prism test (CS‐CPT). (a) Expansion of extracted specimen from beams with and without predamae (C1‐3‐I and C1‐4‐I) according to Reference . (b) Measuring arrangement…”

Section: Resultsmentioning

confidence: 99%

“…In addition, sand (0/2) from the Rhine region was used as fine aggregate. A more detailed petrographic and mineralogical characterization of the chosen aggregates and additional test results on their alkali reactivity are given in Reference , which also gives the chemical composition and physical properties of the road cement used (CEM I 42.5 N (sd), Na 2 O equ. 0.73 wt.‐%).…”

Section: Concretes and Description Of The Investigationsmentioning

confidence: 99%

“…If the expansion exceeds a threshold of 0.5 mm/m or 0.4 mm/m (NaCl solution or water application) after 12 cycles, ASR damage potential is high. A detailed description of the test method is shown in References .…”

Section: Concretes and Description Of The Investigationsmentioning

confidence: 99%

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Effects of fatigue loading and alkali–silica reaction on the mechanical behavior of pavement concrete

Wiedmann

Weise

Kotan

et al. 2017

Structural Concrete

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The primary aim of this paper is to analyze the impact of mechanical pre‐damage and alkali–silica reaction (ASR) on the fracture mechanical properties of pavement concrete. For this purpose, a four point bending test was applied to large format beams to produce a defined level of cyclic pre‐damage. The fatigue‐induced concrete degradation process was simultaneously recorded using a testing procedure specifically developed for the purpose. In addition, fatigue‐induced cracks on extracted drilling cores were spatially visualized and quantified using micro X‐ray 3D‐computed tomography (3D‐CT). The storage of the small‐format test specimens, with and without cyclic pre‐damage, in an ASR‐conducive environment showed that pre‐damage leads to an increase in ASR damage processes. Subsequent structural mechanical investigations on small format specimens with and without pre‐damage show that fatigue loading and ASR significantly influence fracture mechanical parameters of the concrete.

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Zur kolloidalen Natur von AKR‐Produkten

Giebson,

Ludwig

2023

ce papers

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KurzfassungVon den Produkten einer Alkali‐Kieselsäure‐Reaktion (AKR) wird angenommen, dass sie Wasser aufnehmen und sich infolgedessen ein Quelldruck in Gesteinskörnern und im Zementstein aufbaut, der Dehnungen verursacht und schließlich zur Rissbildung im Beton führt. Neuere Untersuchungen haben jedoch gezeigt, dass AKR‐Produkte oft eine kristalline Struktur haben und weniger Wasser aufnehmen als erwartet. Darüber hinaus sind gemessene Quelldrücke oft überraschend gering. Offensichtlich ist die Natur der AKR‐Produkte noch nicht in ausreichendem Umfang verstanden worden.Ergebnisse eigener Untersuchungen zeigten, dass AKR‐Produkte als kolloidale Systeme betrachtet werden können. Um zu klären, ob und inwieweit AKR‐Produkte kolloidale Eigenschaften aufweisen, wurden 10 AKR‐Produkte mit unterschiedlicher Zusammensetzung und unterschiedlichem Wassergehalt bei zwei Temperaturen (40 und 60 °C) synthetisiert. Die AKR‐Produkte wurden über einen Zeitraum von 1,5 Jahren unter anderem mittels der Rasterelektronenmikroskopie, der Nanopartikelanalyse sowie mittels eines Osmosezellenversuchs untersucht. Die Ergebnisse zeigen insbesondere, dass AKR‐Produkte Partikel kolloidaler Größe (50‐600 nm) enthalten. Dadurch kann es im Beton zum DONNAN‐Effekt kommen, der zur Osmose führt und damit eine Erklärung für den AKR‐Quellvorgang liefert.

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Alkali‐silica reaction performance testing of concrete considering external alkalis and preexisting microcracks

Cited by 17 publications

References 12 publications

Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Effects of fatigue loading and alkali–silica reaction on the mechanical behavior of pavement concrete

Zur kolloidalen Natur von AKR‐Produkten

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