Active low-energy belite cement

Staněk, Theodor; Sulovský, Petr

doi:10.1016/j.cemconres.2014.11.004

Cited by 105 publications

(42 citation statements)

References 18 publications

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“…Nonetheless, industrial applications of these methods are limited. High reactive forms of C 2 S can also be stabilized by adding controlled amounts of NaF [8], SO 3 , and B 2 O 3 [9][10][11][12][13]. While the industrial benefits of these later methods are undeniable [14], the availability of raw materials for the necessary impurities can be a concern.…”

Section: Introductionmentioning

confidence: 98%

Carbonation behavior of hydraulic and non-hydraulic calcium silicates: potential of utilizing low-lime calcium silicates in cement-based materials

2016

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This paper presents a study on the carbonation behaviors of hydraulic and nonhydraulic calcium silicate phases, including tricalcium silicate (3CaOÁSiO 2 or C 3 S), c-dicalcium silicate (c-2CaOÁSiO 2 or c-C 2 S), b-dicalcium silicate (b2CaOÁSiO 2 or b-C 2 S), rankinite (3CaOÁ2SiO 2 or C 3 S 2 ), and wollastonite (CaOÁSiO 2 or CS). These calcium silicate phases were subjected to carbonation reaction at different CO 2 concentration and temperatures. Thermogravimetric analysis (TGA) tests were performed to quantify the amounts of carbonates formed during the carbonation reactions, which were eventually used to monitor the degree of reactions of the calcium silicate phases. Both hydraulic and non-hydraulic calcium silicates demonstrated higher reaction rate in case of carbonation reaction than that of the hydration reaction. Under specific carbonation scenario, non-hydraulic low-lime calcium silicates such as c-C 2 S, C 3 S 2 and CS were found to achieve a reaction rate close to that of C 3 S. Fourier transformed infrared (FTIR) spectroscopy and scanning electron microscope (SEM) tests were performed to characterize the carbonation reaction products of the calcium silicate phases. The FTIR spectra during the early stage of carbonation reaction showed formation of calcium silicate hydrate (C-S-H) from C 3 S, c-C 2 S, b-C 2 S, and C 3 S 2 phases with a similar degree of polymerization as that of the C-S-H that forms during the hydration reaction of C 3 S. However, upon further exposure to CO 2 , these C-S-H phases decompose and eventually converted to calcium-modified (Ca-modified) silica gel phase with higher degree of silicate polymerization. Contradictorily, CS phase started forming Ca-modified silica gel phase even at the early stage of carbonation reaction. This paper also revealed the stoichiometry of the Ca-modified silica gel that formed during the carbonation reaction of the calcium silicate phases using the SEM/energy dispersive spectroscopy (EDS) and TGA results.

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Section: Introductionmentioning

confidence: 98%

Carbonation behavior of hydraulic and non-hydraulic calcium silicates: potential of utilizing low-lime calcium silicates in cement-based materials

2016

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“…The use of alternative fuel, the addition of minerals to Portland cement, the inclusion of mineralizers and fluxes in the raw mix, along with the development of alternative binders, are some of the sustainable solutions envisaged today by the cement industry and the scientific community (Lothenbach et al, 2011;Zhang et al, 2012). Belite (Chatterjee, 1996;García-Díaz et al, 2011;Staněk and Sulovský, 2015), alkaline and hybrid alkaline cements (Deschner et al, 2012;García Lodeiro et al, 2013 are among the binders studied as alternatives to the traditional Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

2019

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The mechanical performance of a hybrid cement containing 48% fly ash, 48% mineralized belite clinker, 1. 5% gypsum and 2.5% Na 2 SO 4 was analyzed and the hydration products were identified. The findings showed that the newly designed cement met European standard EN 197-1 compositional, mechanical and setting time requirements (cement type IVB). The hydration products forming in this blended "alkaline-belite" cement (as it was determined through XRD, 29 Si and 27 Al MAS NMR and electron microscopy) consisted in a mix of cementitious gels: C-(A)-S-H and N-(C)-AS -H, which interacted and over time evolved toward the latter with no detriment to the mechanical strength developed by the cement.

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“…Actualmente, se ha encontrado que dicha estabilización es posible a través de la incorporación de aditivos adecuados, complementado con un enfriamiento rápido. Nuevos métodos también han sido estudiados como "reacción de refusión" o el "método sol-gel", pero su escalamiento industrial resulta un reto (Staněk & Sulovský, 2015). Popescu et al (2002) estudiaron las propiedades mecánicas de cementos belíticos con adiciones de hierro e iones de sulfato y fueron comparadas con el cemento Portland (OPC).…”

Section: Cementos Belíticosunclassified

Cementos Belíticos: Alternativa Ambiental e Industrial

Corona¹,

Teixeira²,

Balza³

2018

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La industria del cemento afronta enormes retos: la alta dependencia de combustibles fósiles para sus procesos de producción, la reducción de las fuentes naturales de materia prima, el aumento exponencial de la demanda y la creciente preocupación por aspectos ambientales. Reportes de la Agencia Internacional de Energía (AIE) resaltan que por cada tonelada de cemento Portland producido se libera a la atmósfera una cantidad similar de CO2, lo que equivale aproximadamente al 6% de las emisiones antropogénicas. En respuesta a estas problemáticas, se han realizado modificaciones en los esquemas de fabricación del cemento en cuanto al mayor aprovechamiento energético en las plantas de producción y en la búsqueda de soluciones más duraderas y eficientes, se apunta a la incorporación de nanoaditivos para la obtención de cementos belíticos de bajo costo energético con alto desempeño. Sus amplias ventajas son el resultado de la convergencia de múltiples aspectos, basados en la modificación de la química y microestructura de los materiales compuestos.

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Active low-energy belite cement

Cited by 105 publications

References 18 publications

Carbonation behavior of hydraulic and non-hydraulic calcium silicates: potential of utilizing low-lime calcium silicates in cement-based materials

Carbonation behavior of hydraulic and non-hydraulic calcium silicates: potential of utilizing low-lime calcium silicates in cement-based materials

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

Cementos Belíticos: Alternativa Ambiental e Industrial

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