Preliminary study of effect of LiNO2 on expansion of mortars subjected to alkali-silica reaction

Qinghan, Bian; Nishibayashi, Shinzo; Wu, Xiaofu; Yoshino, Akira; Hong, Zhu; Wang, Tiecheng; Ming-shu, Tang

doi:10.1016/0008-8846(95)00161-1

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…Later, Stark (Stark, 1992) confirmed the effectiveness of LiF and Li 2 CO 3 in inhibiting ASR expansion, and reported that also LiOH seemed to be effective. Several other studies further reported that also LiBr (Qinghan et al, 1995;Bian et al, 1996;Demir and Arslan, 2013;Demir et al, 2018) and LiH 2 PO 4 (Bian et al, 1996) are effective in reducing ASR expansion. Bian et al (Bian et al, 1996) reported LiCl, LiBr, LiNO 2 , LiNO 3 , Li 2 SO 4 , and LiH 2 PO 4 actually produced similar suppressive effects on ASR expansion, whereas Li 2 CO 3 , LiOH, and LiF only exhibited certain effects at a [Li]/[Na + K] molar ratio of 0.8.…”

Section: Types Of LI Saltsmentioning

confidence: 94%

“…In contrast to SCMs, which can only be introduced during concrete production, lithium salt solutions can be applied to an expanding concrete structure in addition to being used as an admixture during production. So far, eleven different types of lithium salts have been studied to mitigate ASR including LiCl, Li 2 CO 3 , LiF, Li 2 SiO 3 , LiNO 3 , Li 2 SO 4 , LiOH, LiNO 2 , LiBr, LiOH•H 2 O, LiH 2 PO 4 (McCoy and Caldwell, 1951;Qinghan et al, 1995;Lumley, 1997;Demir and Arslan, 2013). Some difficulties of using these lithium salts are encountered because the dosage of different types of lithium salts varies significantly depending on several factors such as the type of lithium salts, the mineralogy of reactive aggregates, and the alkali content of the concrete.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Types Of LI Saltsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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

Shi

Lothenbach

2022

Front. Mater.

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“…The expansion reduction may also be attained by chemical additions to the concrete, like lithium compounds. Qinghan et al [7] and Lumley [8] indicate that lithium compounds are effective to inhibit ASR expansion, because it replaces sodium and potassium alkaline ions in ASR gel, densifying it. Notice that, if insufficient lithium is used, the expansion may increase, because lithium compounds may combine with calcium hydroxide as well, producing calcium salts and lithium hydroxide, and increasing hydroxyl ions concentration in the pore solution [9].…”

Section: Introductionmentioning

confidence: 99%

Study of effect of electric arc furnace slag on expansion of mortars subjected to alkali-aggregate reaction

Souza

Zolett

Carrazedo

2016

Rev. IBRACON Estrut. Mater.

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Alkali-aggregate reaction is a chemical reaction between cement alkalis and some reactive mineral present in some aggregates, leading to concrete expansion and cracking. One kind usually observed and studied in Brazil is the alkali-silica reaction, due to its fast development. There are several methods that are effective to control and mitigate this reaction, and one of them is the partial replacement of cement by mineral additions such as pozzolans like fly-ash, silica fume and slag. In this study, we propose the use of electrical steel slag as a partial replacement of cement, evaluating its effectiveness by NBR 15577:2008, employing different proportions as replacement. It seems that the electrical steel slag, despite its expansive behavior, has been effective in the control of the ASR.

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“…[Li]/[Na] = 0.67-1 (Sakaguchi, 1989) [Li]/[Na+K] > 0.7 (Thomas & Stokes, 1999) [Li]/[Na+K] ≥ 0.92 Stark, 1993) [Li]/[Na+K] > 0.72 (Durand 2000) [Li]/[Na+K] ≥ 0.8 (Collins et al 2004) [Li]/[Na+K] = 0.74 to 0.93 (Fournier et al, 2003) [Li]/[Na+K] ≥ 0.8 (Qinghan et al 1995) [Li]/[Na+K] = 0.56 to 1.11 (Tremblay et al, 2004) Li2CO3 (Note 1): more effective to decrease ASR expansion than LiOH and LiNO3 (Vivian, 1947;Sakaguchi, 1989) [Li]/[Na] = 0.67-1 (Sakaguchi 1989) Li2CO3 = 1.0% by wt. of cement (Ohama et al,.…”

Section: Use Of Chemicals To Prevent Asrmentioning

confidence: 99%

Chemical approaches to prevent alkali-silica reaction in concrete – A review

Liu¹,

Mukhopadhyay²,

Hsu³

2018

10.5267/j.esm

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This study synthesizes the use of chemicals to prevent one of common concrete durability problems, alkali-silica reaction (ASR), and can help researchers (i) identify widely used potential chemicals and evaluate these chemical solutions to prevent ASR with proper understanding of mechanisms, and (ii) to identify the research gaps in order to develop guidelines and implementation plan on the use of these chemicals for future research.

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Preliminary study of effect of LiNO2 on expansion of mortars subjected to alkali-silica reaction

Cited by 11 publications

References 2 publications

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

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

Study of effect of electric arc furnace slag on expansion of mortars subjected to alkali-aggregate reaction

Chemical approaches to prevent alkali-silica reaction in concrete – A review

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