Hydration mechanisms of ternary Portland cements containing limestone powder and fly ash

Weerdt, Klaartje De; Haha, Mohsen Ben; Saoût, Gwenn Le; Kjellsen, Knut O.; Justnes, Harald; Lothenbach, Barbara

doi:10.1016/j.cemconres.2010.11.014

Cited by 939 publications

(354 citation statements)

References 33 publications

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“…The presence of additional sulphate had no discernable effect. This effect of slag 196 on the individual clinker phases is in agreement with the literature 42,43 , and a similar effect has been 197 seen with ternary cement systems containing limestone powder and fly ash 44 . 198…”

supporting

confidence: 80%

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The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Whittaker

Zając

Haha

et al. 2014

Cement and Concrete Research

138

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract: The effects on composite cements of the aluminium content of slag plus that of additional sulphate, has been investigated. Samples containing cement or composites with 40% replacement by one of 2 different slags, differing in aluminium contents, were prepared. A further blended sample was prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed comparable strengths to the neat cement system at later ages. Adding slag changed the hydration kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and encouraged the presence of hemicarbonate over monocarbonate. The Ca/Si ratios of the C-S-H formed were comparable between the two blends, being marginally lower than that of the neat system. The addition of anhydrite resulted in the adsorption of sulphate onto the C-S-H, plus stabilisation of ettringite. Corresponding Author 8 9 The Role of the Alumina Content of Slag, plus the Presence of AdditionalAbstract 10 The effects on composite cements of the aluminium content of slag plus that of additional sulphate, 11 has been investigated. Samples containing cement or composites with 40% replacement by one of 2 12 different slags, differing in aluminium contents, were prepared. A further blended sample was 13 prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed 14 comparable strengths to the neat cement system at later ages. Adding slag changed the hydration 15 kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased 16 that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and 17 encouraged the presence of hemicarbonate over monocarbonate.

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confidence: 80%

“…The increased performance is dependent on both the phase assemblage and 43 microstructure. The hydration of slags in OPC blends can also be accompanied with some 44 consumption of CH 12 . 45 The present work focuses on the change in hydrate phase assemblages as cement is blended 46 with blast furnace slag, and relates this to mechanical performance.…”

mentioning

confidence: 99%

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Whittaker

Zając

Haha

et al. 2014

Cement and Concrete Research

138

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“…In any case, it is essential to control/understand the hydration process [14,22,23] without or with SCMs. The effect of the addition of by-products to OPC pastes has already been well described in literature [24,25]. However, for CSA cements, it is needed to understand all parameters involved in the CSA-SCMs hydration, and the key roles of water and SCMs contents.…”

Section: Introductionmentioning

confidence: 99%

Hydration studies of calcium sulfoaluminate cements blended with fly ash

García-Maté

Torre

León‐Reina

et al. 2013

Cement and Concrete Research

155

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The main objective of this work is to study the hydration and properties of calcium sulfoaluminate cement pastes blended with fly ash (FA) and the corresponding mortars at different hydration ages. Laboratory X-ray powder diffraction, rheological studies, thermal analysis, porosimetry and compressive strength measurements were performed. The analysis of the diffraction data by Rietveld method allowed quantifying crystalline phases and overall amorphous contents. The studied parameters were: i) FA content, 0, 15 and 30 wt.%; and ii) water addition, water-to-CSA mass ratio (w/CSA = 0.50 and 0.65), and water-to-binder mass ratio (w/b = 0.50). Finally, compressive strengths after 6 months of 0 and 15 wt.% FA [w/CSA = 0.50] mortars were similar: 73 ± 2 and 72 ± 3 MPa, respectively. This is justified by the filler effect of the FA as no strong evidences of reactivity of FA with CSA were observed. These results support the partial substitution of CSA cements with FA with the economic and environmental benefits.

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“…Varios estudios de la hidratación del cemento han sido realizados para bajas adiciones de calcario (BONAVETTI; RAHHAL; IRASSAR, 2001;TREZZA;LAVAT, 2001;DE WEERDT et al, 2011) mostrando que dicha adición participa de las reacciones de hidratación desde el inicio, favoreciendo la cristalización de carboaluminatos de calcio en lugar del monosulfoaluminato de calcio y consecuentemente estabilizando la formación de etringita.…”

Section: Efecto De La Adición De Filer Calcariounclassified

“…En ausencia de calcario, los aluminatos remanecientes reaccionan con la etringita para formar monosulfoaluminato de calcio (DE WEERDT et al, 2011).…”

Section: Cantidad De Portlandita Y Calcita Por Tgunclassified

Formación tardía de etringita en fibrocemento.

Davila¹

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Este exemplar foi revisado e corrigido em relação à versão original, sob responsabilidade única do autor e com a anuência de seu orientador. IIIDedicado a Carol, Antonia, Samuel, Alfonsina, Bolita y Oliver. IV AGRADECIMIENTOSEs con mucho sentimiento que quiero registrar mi más profundo agradecimiento a todas las personas que se solidarizaron conmigo a la hora de empezar con este proyecto para el mejoramiento de mi vida profesional.A mi familia la destaco por su infinito amor y paciencia que me sirvieron como apoyo y motivación constante.A mis profesores, que con su profesionalismo y experiencia me enseñaron a escoger el camino correcto para identificar la naturaleza de un trabajo decente vinculando la parte profesional con la humana y es aquí donde quiero destacar la excepcional labor como orientador y ser humano del profesor Vanderley John; de igual manera, la profesora María Alba Cincotto contribuyó como nadie podría haberlo hecho mejor y con quien aprendí a reconocer el valor de la excelencia, su carácter siempre será para mí una inspiración para trabajar en el mejoramiento continuo de mi vida académica; de manera muy especial hago mención a la profesora Silvia Selmo por su asesoría y bondad permanentes tan necesarias durante las primeras etapas de mi maestría con lo que me motivó a iniciar mi investigación; al profesor Paulo Helene do Lago haberme dado la oportunidad de trabajar en su empresa; al profesor Alejandro Salazar por haberme mostrado el camino hacia Brasil; finalmente quiero reconocer la participación de todo el cuerpo docente del departamento de Ingeniería civil quienes lograron enriquecer mis conocimientos con sus aulas y experiencias.Por otra parte y de igual importancia, quiero agradecer a todo el cuerpo administrativo y técnico que siempre me brindaron asistencia con competencia y con el valor agregado de la amistad.A mis amigos que me hicieron sentir en casa constantemente. Al soporte brindado por Imbralit e Infibra a manos de los señores Luiz Fernando MarchiJúnior y João Batista Cargnin quienes me transmitieron su experiencia siempre de manera cordial.Al profesor Holmer Savastano por su humildad única, donde radica su gran sabiduría que invita a integrar la ciencia con la vida diaria.A los miembros de la banca de defensa: profesora Ana Paula Kirchheim y profesor Sandro Marden Torres, por la contribución al mejoramiento de este trabajo.Por último, agradezco a cada uno de los brasileros, pues han contribuido con mi manutención y educación por medio de la CAPES y de la USP, y le han enseñado a un V extranjero como yo, que vale la pena invertir en todas las personas olvidando las nacionalidades y las fronteras. VI RESUMEN La temperatura de curado, utilizada por la industria de fibrocemento como catalizador en la hidratación del cemento para lograr alta resistencia inicial en sus productos, genera la hipótesis de expansión causada por formación tardía de etringita. Para el planteamiento de dicha hipótesis, el siguiente estudio contempló dos grupos de muestras con el objetivo de estudiar aisladam...

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Hydration mechanisms of ternary Portland cements containing limestone powder and fly ash

Cited by 939 publications

References 33 publications

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Hydration studies of calcium sulfoaluminate cements blended with fly ash

Formación tardía de etringita en fibrocemento.

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