Alkali carbonate reaction (ACR): Investigations on mechanism of dedolomitization of dolomite in dolostones

Li, Wei; Deng, Min; Mo, H. J.; Panesar, Daman K.; Mao, Zhongyang

doi:10.1016/j.conbuildmat.2022.128942

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…Conversely, in loess disintegration experiments under alkaline conditions, the alkali solutions used are primarily NaOH and Ca(OH) 2 . The main soil-water chemical interactions that occur are precipitation or crystallization, carbonation, pozzolanic reactions [35], dedolomitization [85,86], and the reaction of amphoteric oxides with alkali solution [87].…”

Section: Water-soil Chemical Interactionsmentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

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Loess disintegration is a significant physicochemical and mechanical dissolution process that occurs when loess comes into contact with water. This phenomenon contributes to geological disasters such as loess cave erosion, landslides, and debris flows. The disintegration of loess can be influenced by both internal and external factors. Research on internal factors of loess disintegration has been widely recorded, but the research progress on external environmental factors that affect loess disintegration is not well summarized. This review summarizes the impacts of external water environmental factors on loess disintegration and reveals that six external water environmental factors, namely the temperature of the aqueous solution, hydrodynamic conditions, solution pH, salt concentration and type in the solution, freeze–thaw cycles, and dry–wet cycles, can significantly impact loess disintegration. Furthermore, this review delves into three key research areas in loess disintegration under the influence of these water environmental factors: experimental research on loess disintegration, the disintegration parameters used in such research and their variations, and the water–soil chemical reactions and microstructural changes during loess disintegration. It concludes that current experimental research on loess disintegration suffers from inadequate studies, with existing research associated with poor comparability and weak representativeness, and a lack of comprehensive, systematic analysis of its regularities of influence and response mechanisms from both microscopic and macroscopic perspectives. This paper can provide valuable insights for the prevention of loess geological disasters and engineering safety construction.

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Section: Water-soil Chemical Interactionsmentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

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“…As an important constitute of AAR, ACR may lead to a deterioration for concrete structure, especially for dams, bridges, highways, and ports [15]. The rst report about ACR was in Canada in 1957 [16], and the concept of ACR was proposed rstly by Gillott in 1963 [17].…”

Section: Introductionmentioning

confidence: 99%

Research on alkali-carbonate reaction (ACR) and damage of freeze-thaw for pure dolomite as concrete coarse aggregate

Chen,

Xiong,

Wang

et al. 2024

Preprint

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Alkali-carbonate reaction (ACR) is one of the important components of alkali aggregate reaction (AAR) in concrete structures, which may lead to a serious damage for the concrete construction and effect on the durability of concrete projects adversely. Previous research has systematically investigated the possibility of ACR in dolomitic limestone. However, there is limited literature available for ACR in pure dolomite aggregate specifically. Therefore, this paper aims to investigates whether pure dolomite occur ACR and the freeze-thaw resistance of pure dolomite coarse aggregate concrete (PDCAC) due to the raw materials produced in the southwest of China, which is cold in winter. To determine the alkali activity of pure dolomite, three methods were employed: lithofacies method (LM), rock-cylinder method (RCM), and rapid preliminary screening test for carbonate aggregates (AAR-5). Lithofacies method confirmed that the dolomite used in this paper was pure almost, and no SiO2 content, ruling out the possibility of alkali-silica reaction (ASR). The rock-cylinder method indicated a reduction in length during the 84-day test period, which indicates the absence of ACR. Subsequently, the AAR-5 method was used to test ACR, and the samples exhibited a length expansion rate of far less than 0.1% within 28 days, which further confirmed the absence of alkali activity in pure dolomite. Finally, the freeze-thaw cycles test was carried out on the concrete with pure dolomite as concrete coarse aggregate. The results revealed no significant spalling on the concrete surface after 200 freeze-thaw cycles, and pure dolomite coarse aggregate concrete can withstand freeze-thaw damage to a certain extent.

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“…On the other hand, ASR occurs when the alkaline ions in the cement react with reactive silica minerals in the aggregates, producing a gel-like substance. This gel absorbs water, causing swelling, increased pressure, and similar detrimental effects on the structural integrity of the concrete [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of glass powder in the mitigation of the alkali-silica reaction (ASR)

Freitas,

Dias,

Borges

et al. 2024

Rev. IBRACON Estrut. Mater.

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The alkali-silica reaction (ASR) is one of the problems that can compromise concrete durability, as the chemical reactions between the reactive aggregate and concrete pore solution, specifically sodium (Na+), potassium (K+), calcium (Ca2+) and hydroxyl (OH-) in the presence of moisture, trigger expansion and cracking of concrete elements. The use of pozzolanic materials, such as finely ground glass powder (particles smaller than 75μm), to partially replace cement has been widely studied and has demonstrated beneficial results. However, because the behavior of pozzolans towards ASR is not completely understood yet, this work evaluates the effect of incorporating ground glass powder into cementitious composites against ASR. To this end, 8% silica fume was used as a control admixture, and four levels of glass powder (10, 20, 30, and 50%) were incorporated into the cementitious mixture to partially replace cement. Expansion tests were carried out in accordance with NBR15577-4 (ABNT, 2018) on mortar bars using the accelerated test method to assess the mitigation of expansions. The results show that the expansions caused by ASR decreased with the increasing content of glass powder in the cement mixtures. Furthermore, only the 50% level reduced the expansions to a safe value according to the Brazilian standard.

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Alkali carbonate reaction (ACR): Investigations on mechanism of dedolomitization of dolomite in dolostones

Cited by 8 publications

References 40 publications

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Research on alkali-carbonate reaction (ACR) and damage of freeze-thaw for pure dolomite as concrete coarse aggregate

Evaluation of glass powder in the mitigation of the alkali-silica reaction (ASR)

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