Study on the activation of ternesite in CaO·Al2O3 and 12CaO·7Al2O3 blends with gypsum for the development of low-CO2 binders

Carmona-Quiroga, Paula María; Montes, Myriam; Pato, Esther; Fernández-Jiménez, Ana; Blanco-Varela, María Teresa

doi:10.1016/j.jclepro.2020.125726

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…The ML in these ranges are as follow (Table 5) I st range-1.00-1.53%, II nd range-0.46-0.91%, III rd range-2.65-7.23%, and IV th range-2.46-31.04%. The distribution of ML in the ranges is related to: -I st range, Dehydratation (40-250 °С) [13,19,[42][43][44][45][46][47][48] Figure 7b shows the thermal behavior of Portland cement, characterized by total ML of just over 5% due to: (i) dehydration of crystal bonded water molecules (up to 220 • C); (ii) Ca(OH) 2 and C-S-H gel dehydroxylation of structural OH-anions; and (iii) dolomite decabonation (most of the mass losses (ML)).…”

Section: Thermal Analysismentioning

confidence: 99%

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

et al. 2021

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The advanced tendencies in building materials development are related to the design of cement composites with a reduced amount of Portland cement, contributing to reduced CO2 emissions, sustainable development of used non-renewal raw materials, and decreased energy consumption. This work deals with water cured for 28 and 120 days cement composites: Sample A—reference (white Portland cement + sand + water); Sample B—white Portland cement + marble powder + water; and Sample C white Portland cement + marble powder + polycarboxylate-based water reducer + water. By powder X-ray diffraction and FTIR spectroscopy, the redistribution of CO32−, SO42−, SiO44−, AlO45−, and OH− (as O-H bond in structural OH− anions and O-H bond belonging to crystal bonded water molecules) from raw minerals to newly formed minerals have been studied, and the scheme of samples hydration has been defined. By thermal analysis, the ranges of the sample’s decomposition mechanisms were distinct: dehydration, dehydroxylation, decarbonation, and desulphuration. Using mass spectroscopic analysis of evolving gases during thermal analysis, the reaction mechanism of samples thermal decomposition has been determined. These results have both practical (architecture and construction) and fundamental (study of archaeological artifacts as ancient mortars) applications.

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Section: Thermal Analysismentioning

confidence: 99%

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

et al. 2021

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“…Initially, C 5 S 2 S − was regarded as an inert mineral with a negligible technological significance when encountered as an intermediate phase during the calcination of calcium sulfoaluminate (CSA) cement clinker [8][9][10][11][12][13]. However, recent research has unveiled that C 5 S 2 S − exhibits hydration activity in aluminum-containing environments, positioning it as an intermediary between ye'elimite (C 4 A 3 S − ) and belite (C 2 S) [6,[14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Particle Sizes of SiO2 in Sintering on the Formation of Ternesite

Song,

Huo,

Wang

et al. 2023

Coatings

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Ternesite is synthesized through sintering a mixture of CaCO3, SiO2, and CaSO4 in a molar ratio of 4:2:1. Ternesite has a hydration rate between ye’elimite and belite in an aluminum-containing environment, and is considered to be a new material that can be used to enhance the performance of calcium sulphoaluminate cements. This experiment investigated the influence of different particle sizes of SiO2 on ternesite formation. Controlled partial pressure sintering was employed within the temperature range from 1100 °C to 1200 °C, with a 72 h incubation period. The highest purity of ternesite in the samples reached 99.47% (500 nm SiO2 sample). The analysis results from scanning electron microscopy and an energy dispersive spectrometer indicated that the particle size of SiO2 exerted a significant influence on the formation of ternesite. In the preparation of ternesite from 10 μm particle size SiO2, traces of calcium silicate were found in the product. The results of a thermal analysis further demonstrated significant distinctions in the thermal stability of ternesite prepared with SiO2 of different particle sizes. Additionally, the crystallinity of ternesite was influenced by the particle size of SiO2, consequently impacting the hydration performance of ternesite–calcium sulphoaluminate cement.

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“…Alkali activated cements (AAC) are one of the alternative materials to traditional Portland cement that have attracted more attention in recent years [6][7][8]. The most relevant advantage of this type of material is its heavy incorporation of industrial wastes or byproducts in its composition, which are used as base raw materials.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

et al. 2021

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The development of alternative materials for the construction industry, based on different types of waste, is gaining significant importance in recent years. This is mostly due to the need to increase sustainability of this heavily polluting activity, thus mitigating the dependence on, for instance, Portland cement. The present paper is related to the development of an alkaline activated cement (AAC) exclusively fabricated from industrial by-products (both precursor and activator). Coal combustion fly ash, a common residue from thermoelectric powerplants, and glass waste, from the manufacture of ophthalmic lenses, were used as precursors. These precursors were activated with a recycled alkaline solution, resulting from the cleaning of aluminium extrusion dies, instead of the more common commercial reagents usually applied for this type of binder. Several pastes were studied, combining the precursor and alkaline solution in different proportions. When the most-performing cements were defined, they were used to stabilise a cohesive soil. The experimental procedure and subsequent analysis were designed based on a Response Surface Methodology model, considering the Activator/Solids and Soil/Precursor ratios as the most relevant variables of the stabilisation process. It was observed that, depending on the type of alkaline cement used, there was an optimum precursor and activator contents to optimise the mechanical properties of the stabilised soil. The reliability of this prediction was especially dependent on the type of precursors and, also, on their respective dissolution process right before the homogenization with the soil, under the working conditions available.

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Study on the activation of ternesite in CaO·Al2O3 and 12CaO·7Al2O3 blends with gypsum for the development of low-CO2 binders

Cited by 12 publications

References 34 publications

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

The Effect of Different Particle Sizes of SiO2 in Sintering on the Formation of Ternesite

Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

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