Pozzolanic activity of stockpile ash: Comparison of test methods

Šídlová, Martina; Šulc, Rostislav; Škvára, František; Pulcova, Klara; Formáček, Petr; Snop, Roman

doi:10.1016/j.cscm.2023.e02396

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…The pozzolanic activity of both zeolites types (FCC and NZ) was determined via Chapelle test 25 . This test determines the binding of Ca(OH) 2 in zeolite in an aqueous suspension: 1 g of zeolites reacts with 1 g Ca(OH) 2 in 200 mL of water at 90 °C for 16 h.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Vaičiukynienė,

Nizevičienė,

Kantautas

et al. 2024

Sci Rep

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The production of ordinary Portland cement (OPC) is one of the main global causes of CO2 release to the atmosphere. However, its availability and unique characteristics as a binding material make it difficult to be substituted by eco-friendlier materials. However, OPC partial replacement with pozzolanic materials is one of the best solutions to this problem. Hence, in this study, various types of high-volume zeolite were employed as supplementary cementitious materials (SCM), substituting the OPC by up to 50 wt.% in the composition of the created mortars. Besides, quicklime and inorganic accelerators were included in some of the mortar mixtures to improve the hydration reaction and enhance its speed. The mechanical, durability and durability in sea water properties were investigated. Although the usage of SCM caused a decrease in the mechanical and durability properties of the specimens, the addition of 10 wt.% quicklime palliated this degradation by enhancing by 40% the 28-days compressive strength of the specimens and by significantly improving their durability (porosity, freeze–thaw resistance and carbonation resistance). Moreover, the mixtures were proved to be resistance to aggressive ionic environments, since their compressive strength even increased after 28-day immersion in seawater, due to the additional formation of hydration compounds.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Vaičiukynienė,

Nizevičienė,

Kantautas

et al. 2024

Sci Rep

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show abstract

“…A strong correlation between any two methods would indicate that they are consistently in measuring the pozzolanicity, thereby adding validation to the results. Contrarily, a weak correlation may indicate difference in aspects of pozzolanic activity, making them unreliable [50][51][52]. Also, this relation allows the selection of suitable methods, depending on the time and resource availability alongside improving the intended test methods [23,50,53].…”

Section: Introductionmentioning

confidence: 99%

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Subramanian,

Davis,

Thomas

2024

Eng. Res. Express

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Confirming the pozzolanic activity is crucial to ensure their compatibility and performance in geopolymer composite (GC) applications, as it improves the geopolymerization process and optimizes the strength characteristics of GCs. This work evaluates the pozzolanic properties of Fly ash (FA), Basic Oxygen Furnace (BOF) slag, and Iron Ore Tailings (IOT) for their potential use in the development of Engineered Geopolymer Composites (EGC). IOT partially substitutes fine aggregate, while FA and BOF slag are the major precursors. Pozzolanic properties of the aforementioned materials were assessed through the Frattini, saturated lime test (SLT), and strength activity index (SAI). The Frattini test values recorded were 90, 47, and 30 % of CaO removal, denoting their degree of pozzolanicity respectively for BOF Slag, FA, and IOT. In the SLT, the formation of stable calcium silicate hydrates and aluminates are verified by the reaction of the test pozzolans with lime, thereby conforming their pozzolanicity. The results from the Frattini and SAI tests showed a significant correlation, indicating an effective pozzolanicity measure of the test materials. However, the results from the SLT did not align with the outcomes from the Frattini and SAI tests. This contradiction suggests that the SLT is ineffective compared to the other two test methods in measuring the pozzolanic activity of the test materials. The research findings provide valuable insights into the potential usage of these materials (pozzolans) as sustainable building materials in the construction industry.

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Performance of different fibre types in alkaline-activated concrete produced with industrial wastes: volcanic rock powder and blast furnace slag

Aksüt,

Külekçi,

Çullu

et al. 2024

European Journal of Environmental and Civil Engineering

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Pozzolanic activity of stockpile ash: Comparison of test methods

Cited by 4 publications

References 35 publications

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Performance of different fibre types in alkaline-activated concrete produced with industrial wastes: volcanic rock powder and blast furnace slag

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