Evaluation of accelerated degradation test methods for cementitious composites subject to sulfuric acid attack; application to conventional and alkali-activated concretes

Gu, Lei; Visintin, Phillip; Bennett, Terry

doi:10.1016/j.cemconcomp.2017.12.015

Cited by 78 publications

(33 citation statements)

References 25 publications

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“…Therefore, mass loss alone is not a suitable indicator of resistance to sulfuric acid attack for different binder materials. Similar findings have recently been observed by Gu et al [113].…”

Section: Effect Of Increasing Slag Contentsupporting

confidence: 92%

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Aiken

Kwasny

Sha

et al. 2018

Cement and Concrete Research

232

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Geopolymer (GP) binders are an appealing alternative to Portland cement (PC) binders as they have the potential to reduce the CO 2 emissions associated with the cement and concrete industry. However, their durability in aggressive environments needs thorough examination if they are to become a viable alternative to traditional Portland cement (PC) materials. This study investigated the effect of increasing slag content and activator dosage on the sulfuric acid resistance of fly ash GP binders. Their performance was also compared with that of neat PC mixes using various physical and microstructural techniques. The results show that increasing the slag content of fly ash GPs decreases porosity, but makes the reaction products more susceptible to sulfuric acid attack. It was also found that increasing the alkaline activator dosage of fly ash GPs has little impact on sulfuric acid resistance. Finally, GP binders displayed superior sulfuric acid resistance than their PC counterparts.

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Section: Effect Of Increasing Slag Contentsupporting

confidence: 92%

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Aiken

Kwasny

Sha

et al. 2018

Cement and Concrete Research

232

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show abstract

“…However, the fundamental mechanism of Portland cement sulfate attack, with expansive processes involving the monosulfate-AFm phase, is not possible in most AAMs as this phase is absent from the hydrate products. Sulfuric acid attack on AAMs is, however, a relevant mechanism related to use in sewer infrastructure and other highly aggressive environments [240,241], and the performance of AAMs (particularly those with low Ca content [242,243]) under such conditions has been observed to significantly exceed that of most other cementitious binders [242,244]. Organic acid resistance has also been reported to be a strength of low-calcium AAMs, as small organic acids damage calcium-rich binders through complexation and removal of Ca 2+ ions, but this mechanism is much less significant for AAMs that do not rely on calcium as a key binder constituent [245,246].…”

Section: Durabilitymentioning

confidence: 99%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

493

131

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The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key developments of alkali-activated binders/materials since the last keynote paper was published in 2015. Recent progress on carbonate and belite-ye'elimite-based binders are also reviewed and discussed, as they are attracting more and more attention as essential alternative low-carbon cementitious materials. These classes of binders have a clear role to play in providing a sustainable future for global construction, as part of the available toolkit of cements.

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“…Factually, hydrated cement compounds are stable only in solutions with high concentrations of Ca 2+ and OH − . Hence, the acidic attack of concrete is essential an acidic-alkaline reaction between hydrated cement products and acidic ion [51][52][53]. Firstly, calcium hydroxide is attacked by H + or other acidic ion.…”

Section: Mechanism Analysismentioning

confidence: 99%

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

Long

Luo

et al. 2020

J Infrastruct Preserv Resil

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In order to investigate the deterioration mechanism of steam-cured concrete under severe environmental actions such as acid rain corrosion, salt corrosion, and cyclic thermal loading, accelerated corrosion tests were conducted in this study. Surface damage as well as deteriorative kinetics of steam-cured concrete and cement paste suffering from coupled acid-thermal actions was investigated by soaking-drying cycle experiments. The effects of mineral admixture, curing regime and corrosion condition on the durability were all comparatively studied, and the X-ray diffractograms and nanoindentation were applied to analyse the mechanism of corrosion deterioration. The results revealed that compared with the cementitious materials under standard curing, larger depth and faster corrosion were observed for steam-cured concrete and cement paste, which might be partly attributed to the lower content of hydrated production presented in steam-cured specimens. Besides, under acid solution soaking-drying cycle regime, there was significant higher corrosion depth compared to only soaking in acid solution. The corrosion depth under steam curing and soaking-drying condition increased by 156.68% and 44.17%, respectively, compared with those under standard curing and only soaking treatment. In addition, fly ash effectively decreased the corrosion depth of steam-cured cement paste and concrete by 64.98% and 16.33%, respectively.

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Evaluation of accelerated degradation test methods for cementitious composites subject to sulfuric acid attack; application to conventional and alkali-activated concretes

Cited by 78 publications

References 25 publications

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Recent progress in low-carbon binders

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

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