Ambient cured high calcium fly ash geopolymer concrete with dolomite powder

Prabha, V. C.; Revathi, V.; Reddy, Sekhar

doi:10.1080/19648189.2021.2012262

Cited by 10 publications

(1 citation statement)

References 47 publications

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“…In fact, there are limited studies regarding the utilization of HCFA, which is a more problematic energetic waste. For this reason, there are works considering the small addition of HCFA (about 20%) to geopolymer synthesis with other raw materials, and high compressive strength values (>40 MPa) were reported [ 68 ]. A novel approach is the concept of so-called “intelligent buildings”, where materials used in the building industry can remove CO 2 from the air [ 69 , 70 ].…”

Section: Resultsmentioning

confidence: 99%

Decarbonatization of Energy Sector by CO2 Sequestration in Waste Incineration Fly Ash and Its Utilization as Raw Material for Alkali Activation

Mokrzycki,

Baran,

Gazda-Grzywacz

et al. 2023

Materials

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In this study, municipal solid waste incineration (MSWI) fly ash was subjected to mineral carbonation with the aim of investigating CO2 sequestration in waste material. The conducted study follows the trend of searching for alternatives to natural mineral materials with the ability to sequestrate CO2. The mineral carbonation of MSWI fly ash allowed for the storage of up to 0.25 mmol CO2 g−1. Next, both carbonated and uncarbonated MSWI fly ashes were activated using an alkaline activation method by means of two different activation agents, namely potassium hydroxide and potassium silicate or sodium hydroxide and sodium silicate. Mineral carbonation caused a drop in the compressive strength of alkali-activated materials, probably due to the formation of sodium and/or potassium carbonates. The maximum compressive strength obtained was 3.93 MPa after 28 days for uncarbonated fly ash activated using 8 mol dm−3 KOH and potassium hydroxide (ratio 3:1). The relative ratio of hydroxide:silicate also influenced the mechanical properties of the materials. Both carbonated and uncarbonated fly ashes, as well as their alkali-activated derivatives, were characterized in detail by means of XRD, XRF, and FTIR. Both uncarbonated and carbonated fly ashes were subjected to TG analysis. The obtained results have proved the importance of further research in terms of high-calcium fly ash (HCFA) utilization.

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Section: Resultsmentioning

confidence: 99%