Efficiency of natural pozzolans, ground glasses and coal bottom ashes in mitigating sulfate attack and alkali-silica reaction

Kasaniya, Mahipal; Moffatt, Edward G.

doi:10.1016/j.cemconres.2021.106551

Cited by 47 publications

(19 citation statements)

References 30 publications

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“…A number of publications have used reactivity test outputs to predict the properties of cement paste, mortar, and concrete, or have discussed the potential of doing so [8][9][10][12][13][14][16][17][18][19][20][32][33][34][35]. We do not attempt to cover all publications or their results in detail, but present important findings and their implications.…”

Section: Prediction Of Cement Paste Mortar and Concrete Propertiesmentioning

confidence: 99%

“…In such cases, factors other than reactivity could dominate expansion. Because free alkali, calcium, and alumina contents can strongly influence ASR expansion, developed relationships require corrections based on SCM composition [34,36].…”

Section: The Modified R 3 Testmentioning

confidence: 99%

“…Kasaniya et al performed detailed investigations into the links between concrete strength and durability and the mortar lime strength for a number of SCMs [18,34]. The 7-day lime strength provided a reasonable, although not strong indication of 91-day concrete strength (R 2 = 0.56).…”

Section: The Lime Strength Testmentioning

confidence: 99%

“…The scatter is explained by different reaction kinetics, and secondary factors such as chloride binding and pore solution compositional alterations that affect durability apart from microstructural refinement [18]. Sulfate attack and ASR expansion were studied by the authors on the same set of SCMs [34]. No relationship was found between sulfate attack expansion and the lime strength, in part because of two major outliers (Class C fly ash and metakaolin).…”

Section: The Lime Strength Testmentioning

confidence: 99%

“…As the lime strength increased, ASR expansion reduced. However, mortars high in alkali or CaO were outliers and had greater expansion than would be expected from their lime strength [34]. The authors emphasized that sulfate attack and ASR expansion depend on reactivity, but also on SCM chemical composition and replacement level in a complex manner.…”

Section: The Lime Strength Testmentioning

confidence: 99%

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Recent developments in reactivity testing of supplementary cementitious materials

Suraneni

2021

RILEM Tech Lett

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Identification and rapid characterization of novel supplementary cementitious materials (SCMs) is a critical need, driven by shortfalls in conventional SCMs. In this study, we present a discussion of recently developed reactivity tests – the R3 test, the modified R3 test, the lime strength test, and the bulk resistivity index test. These tests measure reactivity parameters such as heat release, bound water, calcium hydroxide consumption, strength, and bulk resistivity. All tests can screen inert from reactive materials. To additionally differentiate pozzolanic and latent hydraulic materials, two parameters, for example, calcium hydroxide consumption and heat release, are needed. The influences of SCM bulk chemistry, amorphous content, and fineness on measured reactivity are outlined. Reactivity test outputs can predict strength and durability of cement paste/mortar/concrete; however, caution must be exercised as these properties are influenced by a variety of other factors independent of reactivity. Thoughts are provided on using reactivity tests to screen materials for concrete durability.

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Section: Prediction Of Cement Paste Mortar and Concrete Propertiesmentioning

confidence: 99%

Section: The Modified R 3 Testmentioning

confidence: 99%

Section: The Lime Strength Testmentioning

confidence: 99%

Section: The Lime Strength Testmentioning

confidence: 99%

Section: The Lime Strength Testmentioning

confidence: 99%

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Recent developments in reactivity testing of supplementary cementitious materials

Suraneni

2021

RILEM Tech Lett

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Studying the effectiveness of sewage sludge ash and its combination with natural pozzolans in controlling alkali–silica reaction

Amirjani,

Maleki,

Ramezanianpour

2024

Structural Concrete

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Sewage sludge ash (SSA), obtained by the incineration of sewage sludge, which is a byproduct of water treatment, could be used as a cement replacement material (CSR) to promote sustainability. SSA characteristics differ due to its different sources, compositions, and incineration methods. On the other hand, extensive investigations have highlighted the CSRs' ability to control alkali–silica reaction (ASR) as a destructive phenomenon, threatening durability. Hence, this study was conducted in order to study the ability of SSA with two finenesses, three replacement levels, and also its ternaries with trass or pumice, as natural pozzolans, to control ASR. The utilized SSA did not meet the requirements of a pozzolan at either finenesses. The results revealed that despite the fact that SSA generally reduced ASR expansion significantly, it only managed to control ASR at 50% replacement level. This was true for both finenesses. Furthermore, ternaries improved resistance against ASR expansion significantly, providing the ability to control ASR at lower replacement levels of SSA. The Si/Ca ratio was the key reason of SSA's ability to control ASR as it contained 1.5 and 2.5 times more SiO2 and Al2O3 than Portland cement respectively, and about one third of its CaO. Scanning electron microscopey (SEM), energy dispersive spectroscopy (EDS), and mapping confirmed that the relative amounts of Si, Al, and Ca in the SSA was crucial.

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Investigating Supplementary Cementing Materials for Alkalis and Pore Fluid Properties

Kasaniya

2023

RILEM Bookseries

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Efficiency of natural pozzolans, ground glasses and coal bottom ashes in mitigating sulfate attack and alkali-silica reaction

Cited by 47 publications

References 30 publications

Recent developments in reactivity testing of supplementary cementitious materials

Recent developments in reactivity testing of supplementary cementitious materials

Studying the effectiveness of sewage sludge ash and its combination with natural pozzolans in controlling alkali–silica reaction

Investigating Supplementary Cementing Materials for Alkalis and Pore Fluid Properties

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