Assessment of the potential alkali-reactivity of slow-reacting aggregates from the province of Buenos Aires, Argentina

Marfil, Paula Mariana Perez; Locati, Francisco; Marfil, Silvina Andrea; Falcone, Darío Daniel

doi:10.1007/s10064-019-01551-w

Cited by 4 publications

(2 citation statements)

References 39 publications

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“…Sound understanding of mineralogical and geochemical factors on the development of alkali-silica reaction is one of the most effective approaches on how to mitigate its occurrence Laboratory testing of the aggregate's alkali-silica reactivity by various accelerated methods became the most popular approach on the evaluation of rock susceptibility to this deleterious chemical reaction. Recently, rapid to ultrarapid test methods by using mortar bars subjected to high temperatures of about 80 °C are replaced by a slower concrete prism test at lower temperatures of 38 or 60 °C (Marfil et al 2019). Mutual correlation of likelihood of alkali-silica reactivity obtained by these methods is rather controversial; however, a slower concrete prism test at lower temperature proves better results and sound correlation to the content of microcrystalline silica (Marfil et al 2019).…”

Section: Extending Knowledge On Alkali-silica Reactivitymentioning

confidence: 99%

“…Recently, rapid to ultrarapid test methods by using mortar bars subjected to high temperatures of about 80 °C are replaced by a slower concrete prism test at lower temperatures of 38 or 60 °C (Marfil et al 2019). Mutual correlation of likelihood of alkali-silica reactivity obtained by these methods is rather controversial; however, a slower concrete prism test at lower temperature proves better results and sound correlation to the content of microcrystalline silica (Marfil et al 2019).…”

Section: Extending Knowledge On Alkali-silica Reactivitymentioning

confidence: 99%

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Special issue on construction aggregates

Přikryl

2021

Bull Eng Geol Environ

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Section: Extending Knowledge On Alkali-silica Reactivitymentioning

confidence: 99%

Section: Extending Knowledge On Alkali-silica Reactivitymentioning

confidence: 99%

Special issue on construction aggregates

Přikryl

2021

Bull Eng Geol Environ

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Validation of a New Limit in Mortar Bars for Spanish Granitic Aggregates

Velasco-Torres,

Lanza Fernández,

Alaejos Gutiérrez

et al. 2024

RILEM Bookseries

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Evolution of Alkali Release by an Illitic Rock for Use as Supplementary Cementitious Material

Lemma

Marfil

Rahhal

2022

Clays and clay miner.

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The levels of CO2 emissions generated by the cement industry and the growth in demand for its products have led to a search for ways to reduce these emissions. The use of supplementary cementitious materials has become one of the solutions proposed for this problem. Illite, which is found all over the world, is a possible supplementary cementitious material. Before illite can be used, it must be milled and treated thermally in order to activate it, so that the alkalis (Na+ and K+) are free and available to react. Alkalis in cement participate in deleterious reactions (alkali-silica reaction) or have a beneficial effect (alkaline activation). The alkalis present in the rocks can play an active role in these phenomena, however. In addition, the material could be influenced by the alkaline environment produced by the cement. The current study was aimed at analyzing whether an alkali release occurs and if so, how it is affected when a milled and thermally treated illitic rock is in contact with water or an alkaline solution. The material was characterized by X-ray fluorescence, polarizing microscopy, and X-ray diffraction (XRD). The sample was treated thermally at 300, 600, and 900°C, and the thermal activation was evaluated through XRD, density, and Atterberg limits. The evolution of alkali release was studied by determining the sodium and potassium concentration of contact water obtained by mixing the samples with different pH solutions for various lengths of time. In addition, the calcium concentration was determined. The concentrations of sodium and potassium in the contact water were determined by flame photometry, and of calcium by EDTA (ethylenediaminetetraacetic acid) titration. The results showed that with increasing age, increasing solution pH, and higher treatment temperatures, alkali release occurred and increased, whereas Ca2+ concentration decreased.

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Assessment of the potential alkali-reactivity of slow-reacting aggregates from the province of Buenos Aires, Argentina

Cited by 4 publications

References 39 publications

Special issue on construction aggregates

Special issue on construction aggregates

Validation of a New Limit in Mortar Bars for Spanish Granitic Aggregates

Evolution of Alkali Release by an Illitic Rock for Use as Supplementary Cementitious Material

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