Experimental study and empirical modeling of lithium nitrate for alkali-silica reactivity

Islam, Mohammad S.; Ghafoori, Nader

doi:10.1016/j.conbuildmat.2016.06.026

Cited by 13 publications

(5 citation statements)

References 20 publications

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“…Of course, the statistical part of the model allow to find back the experimental results, but the practical part here is to link it with a chemo-mechanical model that allows a quantitative determination of mitigating lithium dosage for real cases. Some researchers such as Islam & Ghafoori [7] [24] also did regression to determine critical [Li]/[Na+K] but used only mathematical models with no link with mechanics such as the model of Larive has.…”

Section: Critical [Li]/[na+k] Model Construction and Final Resultsmentioning

confidence: 99%

Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity

Vacher

Jacobsen

2022

Nordic Concrete Research

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The Alkali-Silica Reaction (ASR) is a deleterious concrete chemical reaction that has been studied a lot since its discovery in 1940. The reaction produces a highly hygroscopic silica gel that swells into the pores of concrete, resulting in the critical decrease of the mechanical performances of the affected structures. Some methods have been investigated to limit expansion under a certain limit, among them lithium mitigation. However, the mechanisms are not really understood yet and determining the right amount of lithium is still arduous. An attempt for a method in coherence with experience is presented in this study, using the chemo-mechanical model of Larive and curve-fitting. The results provide accuracy to experimental measurements from several protocols, and call for further research.

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Section: Critical [Li]/[na+k] Model Construction and Final Resultsmentioning

confidence: 99%

Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity

Vacher

Jacobsen

2022

Nordic Concrete Research

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“…Regardless of the above-mentioned factors, it is generally accepted that a dosage of Li/(Na + K) of >0.6 is required to inhibit ASR (Collins et al, 2004b;Leemann et al, 2014;Islam and Ghafoori, 2016) as illustrated in Figure 5 reproduced based on the data from literature (Qinghan et al, 1995;Thomas et al, 2000;Collins et al, 2004b;Mo et al, 2005;Folliard et al, 2006;Kobayashi and Takagi, 2020) and in Table 1.…”

Section: Li/(k + Na) Ratio and Its Influencing Factorsmentioning

confidence: 99%

Role of Aluminum and Lithium in Mitigating Alkali-Silica Reaction—A Review

Shi

Lothenbach

2022

Front. Mater.

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Effective mitigation of alkali-silica reaction (ASR) is critical for producing durable concrete. The use of alumina-rich supplementary cementitious materials (SCMs) and chemical admixtures such as lithium salts to prevent expansion caused by ASR was first reported 70 years ago, shortly after the discovery of ASR in 1940s. Despite numerous investigations, the understanding of the mechanisms of Al and Li for mitigating ASR remain partially inexplicit in the case of Al, and hardly understood in the case of Li. This paper reviews the available information on the effect of Al and Li on ASR expansion, the influencing factors, possible mechanisms and limitations. The role of Al in mitigating ASR is likely related to the reduction of dissolution rate of reactive silica. Moreover, the presence of Al may alter the structure of crystalline ASR products to zeolite or its precursor, but such effect seems to be not that significant at ambient conditions due to the slow kinetics of zeolite formation. Several mechanisms for the lithium salts in mitigating ASR have been proposed, but most of them are not conclusive primarily due to the lack of knowledge about the formed reaction products. Combination of Al-rich SCMs and lithium salts may be used as an economic solution for ASR mitigation, although systematic studies are necessary prior to the applications.

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“…Following the discovery of the beneficial effects of lithium ions on ASR-related expansion in 1951, the effects of lithium compounds on ASR have been extensively studied [1]. However, the exact role of Li+ ions in controlling ASR is still unclear [2,3,4,5]. Several mechanisms have been proposed, including (i) enhance chemical stability of reactive silica exposed to pore solution [6,7,8], (ii) formation of less expansive Si–Li reaction products [9,10,11,12], (iii) formation of physical barrier by insoluble Si–Li reaction products [11,13,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of LiNO3 on Expansion of Alkali–Silica Reaction in Rock Prisms and Concrete Microbars Prepared by Sandstone

Liu

Deng

2019

Materials

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The aim of this research is to investigate the effect of LiNO3 on the alkali–silica reaction (ASR) expansion of reactive sandstone and the mechanism through which this occurs. This paper presents the results from tests carried out on rock prisms and concrete microbars prepared by sandstone and LiNO3. The findings show that LiNO3 does not decrease the expansion of these samples unless the molar ratio of [Li]/[Na + K] exceeds 1.66, and the expansion is greatly increased when its concentration is below this critical concentration. The expansion stress test proves that Li2SiO3 is obviously expansive. X-ray diffraction (XRD) and scanning electron microscope (SEM) results indicate that LiNO3 reacts with the microcrystalline quartz inside sandstone, inhibiting the formation of ASR gel, and the formation of Li2SiO3 causes larger expansion. A high concentration of LiNO3 might inhibit the ASR reaction in the early stages, and the formation of Li2SiO3 causes expansion and cracks in concrete after a long period of time.

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Experimental study and empirical modeling of lithium nitrate for alkali-silica reactivity

Cited by 13 publications

References 20 publications

Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity

Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity

Role of Aluminum and Lithium in Mitigating Alkali-Silica Reaction—A Review

Effect of LiNO3 on Expansion of Alkali–Silica Reaction in Rock Prisms and Concrete Microbars Prepared by Sandstone

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