Incorporation mechanism of titanium in Portland cement clinker and its effects on hydration properties

Shang, Dechen; Wang, Maoguo; Xia, Zhongsheng; Hu, Shuguang; Wang, Fazhou

doi:10.1016/j.conbuildmat.2017.03.129

Cited by 40 publications

(9 citation statements)

References 21 publications

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“…The amorphous phase is undetectable in the XRD patterns. , The amorphous content before carbonation probably indicates the phase exists among the crystalline grains, which has a similar Ca/Si ratio and is distinguishable from the BSE images . After carbonation, the amorphous content increases with the elapse of carbonation time.…”

Section: Resultsmentioning

confidence: 93%

“…7,11 The amorphous content before carbonation probably indicates the phase exists among the crystalline grains, which has a similar Ca/Si ratio and is distinguishable from the BSE images. 24 After carbonation, the amorphous content increases with the elapse of carbonation time. The amorphous calcium silicates are speculated to be carbonated along with the crystalline calcium silicates.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Comparative Study on the Carbonation-Activated Calcium Silicates as Sustainable Binders: Reactivity, Mechanical Performance, and Microstructure

Liu

Wang

2019

ACS Sustainable Chem. Eng.

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Calcium silicate minerals can react with CO2 to form calcium carbonate and have been proposed to be a sustainable binder as a potential CO2 sinker. In this study, the carbonation characteristics are comparatively assessed among calcium silicates having different calcium/silica (Ca/Si) ratios and polymorphs (CS, C3S2, γ-C2S, β-C2S, C3S). Calcium silicate compacts exposed to a 100% CO2 environment at a 0.4 MPa pressure were tested for carbonation temperature evolution, degree of carbonation (DOC), mechanical properties, and microstructural characterization. Results indicate γ-C2S is the most reactive, reaching a DOC of 50% in 24 h, followed by C3S2, CS, β-C2S, and C3S, which generally agrees with the pattern of the cumulative normalized temperature increase. Meanwhile, carbonated β-C2S compact attains the highest compressive strength of 80 MPa in 24 h, followed by γ-C2S, C3S2, and C3S, while CS only reaches 20 MPa. Calcite and aragonite are the preferable polymorphs of calcium carbonate in the carbonated C3S, γ-C2S, β-C2S, and C3S2, while only the carbonation of CS generates vaterite in addition to calcite and aragonite. The unreacted grains coated by a thin rim of calcium-modified silica gels are encapsulated by the continuous calcium carbonates, which composes the skeleton of the carbonated calcium silicates.

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Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 99%

Comparative Study on the Carbonation-Activated Calcium Silicates as Sustainable Binders: Reactivity, Mechanical Performance, and Microstructure

Liu

Wang

2019

ACS Sustainable Chem. Eng.

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“…The diffraction peak of C 4 A 3 $ is generally weakened and the characteristic peak of C 3 S are almost not observed with the increasing burning temperatures. It is probably related to the decomposition of C 4 A 3 $ at temperature higher than 1350°C [27,28] which provides an unfavorable condition for the formation of C 3 S. In general, the intensity of diffractive peak is related to the content and crystallinity of phase [29]. Therefore, this suggests that excessive the A/F molar ratio not facilitates the formation of C 3 S and the coexistence of C 4 A 3 $ and C 3 S. Thus, it can be drawn that the composition and content of liquid phase have the significantly effect on the formation of clinker mineral.…”

Section: Resultsmentioning

confidence: 99%

EFFECT OF FERRITE PHASE ON THE FORMATION AND COEXISTENCE OF 3CaO.3Al₂O₃.CaSO₄ AND 3CaO.SiO₂ MINERALS

Lu¹

2017

Ceramics - Silikaty

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“…No processo de fabricação do clínquer Portland, o dióxido de titânio (TiO2) atua como um mineralizante, reduzindo a temperatura de formação da fase líquida e aumentando a quantidade de material fundido, além de alterar a viscosidade e a tensão superficial dessa fase, de forma a aumentar a difusão de íons cálcio. Consequentemente, o TiO2 acelera a velocidade das reações, o que contribui para a formação da alita e para o consumo da cal livre (KATYAL et al, 1999;MA;WANG, 2009;SHANG et al, 2017).…”

Section: Introductionunclassified

Efeito da incorporação de resíduo de TiO2 (MNR) na formação das fases mineralógicas de clínquer Portland

et al. 2019

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Resumo O reaproveitamento de resíduos industriais para o setor da construção civil tem se mostrado uma alternativa ambiental e economicamente atrativa, principalmente para a indústria do cimento, que por muito tempo tem procurado procedimentos que efetivamente reduzam a alta energia e emissões de CO2 gerados durante a produção de clínquer. Nesse sentido, destaca-se a necessidade de utilização de materiais alternativos na produção de clínquer como substitutos parciais às matérias-primas. Dessa forma, o objetivo da presente pesquisa é avaliar a produção de clínquer Portland com baixa emissão de dióxido de carbono a partir da incorporação de minério não reagido (MNR), resíduo gerado durante a produção de dióxido de titânio (TiO2). As emissões de dióxido de carbono geradas durante a produção desse material foram verificadas através de análises térmicas (TG/DTG), e a influência do resíduo na formação de fases dos clínqueres foi verificada por análise mineralógica (DRX), por microscopia óptica (MO) e por microscopia eletrônica de varredura (MEV). A partir dos resultados obtidos, determinou-se o teor de incorporação ideal de TiO2 para produção de clínquer, sendo constatado que o MNR, até um teor limite de incorporação, atua como mineralizante, sendo, assim, benéfico para a formação de alita.

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Incorporation mechanism of titanium in Portland cement clinker and its effects on hydration properties

Cited by 40 publications

References 21 publications

Comparative Study on the Carbonation-Activated Calcium Silicates as Sustainable Binders: Reactivity, Mechanical Performance, and Microstructure

Comparative Study on the Carbonation-Activated Calcium Silicates as Sustainable Binders: Reactivity, Mechanical Performance, and Microstructure

EFFECT OF FERRITE PHASE ON THE FORMATION AND COEXISTENCE OF 3CaO.3Al₂O₃.CaSO₄ AND 3CaO.SiO₂ MINERALS

Efeito da incorporação de resíduo de TiO2 (MNR) na formação das fases mineralógicas de clínquer Portland

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