Future and emerging supplementary cementitious materials

Snellings, Ruben; Suraneni, Prannoy

doi:10.1016/j.cemconres.2023.107199

Cited by 87 publications

(18 citation statements)

References 198 publications

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“…From an environmental perspective, replacing clinker with minerals additions (i.e., supplementary cementitious materials (SCMs), and fillers) is one of the best approaches to reduce the CO 2 emissions from concrete and other cement-based materials, as it hardly affects clinker production (i.e., no new kilns are needed) . However, the hydrates formed in the presence of SCMs differ from the ones resulting from the exclusive hydration of PC (due to the lower calcium content of most SCMs), which influence the volume, porosity, and microstructure of the paste and ultimately affect the strength and durability of the material .…”

Section: Cement Hydrationmentioning

confidence: 99%

Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials

Ruiz-Agudo,

Cölfen

2024

Chem. Rev.

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Section: Cement Hydrationmentioning

confidence: 99%

Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials

Ruiz-Agudo,

Cölfen

2024

Chem. Rev.

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“…In addition, many phases do not have a fixed composition but are solid solutions. This heterogeneity is increased by the development of new ecoefficient cements, 16 both in terms of composition and particle morphology. The dissolution and precipitation mechanisms lead to a large range of grain and particle sizes from a few hundred nanometres to a few tens of micrometres.…”

Section: Sem-eds Limitations For Cementitious Materialsmentioning

confidence: 99%

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Georget,

Schmatz,

Wellmann

et al. 2023

Journal of Microscopy

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Many methods have been proposed to analyse SEM‐EDS hypermaps of hydrated cementitious materials but none can fit all purposes. In this presentation, we review existing methods for phase identification, stoichiometry quantification, and microstructure quantification in cementitious materials and related materials. We first discuss the unique contribution of SEM‐EDS with respect to the outstanding scientific challenges towards sustainable construction materials. We then compare the SEM‐EDS and image analysis techniques which contribute to answering these challenges. Convergence and divergence in current methods and workflows, and knowledge gaps are highlighted in terms of the specificities of the material (phase assemblage complexity, grain sizes, mixtures, etc.). The discussion is weighted by the required expert knowledge for the sample preparation, microscope operation, and data analysis. We conclude by discussing how microscopy and image analysis integrate into the overall experimental toolkit to investigate and improve cementitious materials.

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“…A widely adopted approach to reduce the greenhouse gas emissions associated with existing energy-intensive construction materials is their partial replacement with waste byproducts. , One potential waste byproduct that is currently landfilled but has the potential to be a partial substitute for energy-intensive construction materials is the waste-to-energy (WTE) fly ash (hereafter referred to as WTE ash)a byproduct of municipal solid waste incineration . Currently, ∼11% (∼222 million tons per year) of the municipal solid waste generated worldwide is incinerated at controlled WTE facilities, and our reliance on WTE facilities for managing waste will likely increase considering the projected rise in municipal solid waste generation worldwide from 1.9 Gt/yr in 2015 to 3.5 Gt/yr in 2050. − The increased dependence on WTE facilities will generate increased amounts of WTE ashes containing significant amounts of development minerals (calcite, portlandite, gypsum, and quartz)a resource that can meet the increasing demand for construction materials. , …”

Section: Introductionmentioning

confidence: 99%

Reducing Pb and Cl Mobility in Waste-to-Energy Fly Ashes via Chlorellestadite Formation

Kumar,

Baral,

Roesler

et al. 2024

ACS EST Eng.

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Sustainably sourced development minerals are vital to meeting the demand for low-carbon construction materials. A potential waste material that can be a low-carbon construction material for cementitious systems is waste-to-energy fly ash (WTE ash), a byproduct of waste incineration. WTE ash contains chloride-bearing species and heavy metals, which can promote steel reinforcement corrosion and present long-term leaching risks.Here, we present a new multistep ash treatment protocol involving dissolution and heating to transform the nonreadily removable chlorides in WTE ash to chlorellestadite [Ca 10 (SiO 4 ) 3 (SO 4 ) 3 Cl 2 ]. Our results suggest that this transformation significantly reduces chloride release from WTE ash in an alkaline cement-like environment by over 2 orders of magnitude, from 1500 mg/L to less than 10 mg/L. This transformation also significantly reduces Pb mobility after treatment (from >5 mg/L to <0.5 mg/L), likely caused by the crystallo-chemical incorporation of Pb in chlorellestadite. In contrast to the existing ash treatment methods, the proposed ash treatment protocol minimizes heavy metals volatilization while simultaneously reducing Pb mobility and chloride release through chlorellestadite formation. These findings overcome limitations preventing the commercial use of WTE ash and thus opening up pathways toward a circular economy.

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Future and emerging supplementary cementitious materials

Cited by 87 publications

References 198 publications

Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials

Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Reducing Pb and Cl Mobility in Waste-to-Energy Fly Ashes via Chlorellestadite Formation

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