Early hydration and microstructure formation of Portland cement paste studied by oscillation rheology, isothermal calorimetry, 1H NMR relaxometry, conductance and SAXS

Bogner, Andreas; Link, Julian; Baum, Mathias; Mahlbacher, Markus; Gil-Díaz, Teba; Lützenkirchen, Johannes; Sowoidnich, T.; Heberling, Frank; Schäfer, Thorsten; Ludwig, Horst‐Michael; Dehn, Frank; Müller, Harald; Haist, Michael

doi:10.1016/j.cemconres.2020.105977

Cited by 59 publications

(19 citation statements)

References 32 publications

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“…Within this context it is suggested that ettringite formation might play a role in the stiffening of the paste, while the main contributions are likely caused by alite hydration (CH and C-S-H formation), in line with previous results [13,18]. This linearity is in line with previous research by the authors [13].…”

Section: Anhydritesupporting

confidence: 91%

“…Roussel and coworkers, for example, reasoned that thixotropy cannot be explained by a DLVO-driven particle agglomeration on its own but rather depends on the deposition of nano-scale calcium-silicate-hydrate (C-S-H) precipitates on the particles surfaces, leading to a mechanical bridging effect [11,12]. Own results show that, especially for later ages (i.e., beyond approximately 2 to 3 h after water addition) and higher temperatures (>30 • C), the formation of C-S-H significantly contributes to the stiffening of cement suspensions [13], supporting earlier findings on the role of alite (C 3 S) hydration on stiffening of fresh cement pastes [14,15]. Additionally, the hydration of tricalcium aluminate (C 3 A) is known to significantly influence the rheology of fresh concrete [16].…”

Section: Introductionmentioning

confidence: 99%

“…When looking at the results, close attention must be paid to the fact that rheological properties are measured and compared. Whereas in the work by Roussel [11,12] and by the authors of [3,13], the change in paste yield stress or stiffness was considered, the work of Rößler et al and that of Jakob et al addressed the change in the viscosity of the paste at somewhat higher shear rates [17,19]. Currently, it is not known how the mineralogical changes occurring during hydration influence the rheology, especially the thixotropy of the paste at low shear.…”

Section: Introductionmentioning

confidence: 99%

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The Influences of Cement Hydration and Temperature on the Thixotropy of Cement Paste

et al. 2020

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The rheological properties of fresh cement paste are highly influenced by a large number of parameters, among which the most important factors are the applied shear stress, and the shear history, the age of the sample and the temperature. The effects of these parameters on the yield stress (designated as structural limit stress in this work), the viscosity and the structural recovery rate (i.e., the change in dynamic viscosity with time at rest) were studied. In parallel, the changes in ion composition of the carrier liquid, mineral phase content and granulometry were investigated. The results reveal that all investigated rheological parameters exhibit an approximated bi-linear trend with respect to the degree of hydration, with a period of quasi-constant properties until a degree of hydration of approximately 0.07, followed by a non-linear increase. This increase could be attributed to the formation of calcium hydroxide (CH) and calcium-silicate-hydrate (C-S-H) via calorimetry results. With regard to the effect of the shear history of the sample on the rheological properties, the structural limit stress showed a minor dependency on the shear history immediately after the end of shearing, which, however, vanished within the first minute at rest. The same is true for the structural recovery rate. The presented results give detailed insights into the influences of hydration and shear on the rheological properties-especially the thixotropy-of fresh cement pastes.

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Section: Anhydritesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influences of Cement Hydration and Temperature on the Thixotropy of Cement Paste

et al. 2020

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“…The microstructure formation process of fresh paste at rest has been investigated by many advanced techniques-the focused beam reflectance measurement, [25][26][27][28][29] ultrasound technique, [30][31][32][33] scanning electron microscopy, 34,35 and small-angle neutron scattering. 36 Most published researches showed that the number and size of floc in cement paste increase with time while the porosity of paste decreases with time during setting. The cryo-scanning electronic microscopy (SEM) image 33 found that a cohesive structure of cement particles is completely formed in a fresh cement paste within 120 minutes.…”

Section: Introductionmentioning

confidence: 99%

“…The elasticity development of cement paste during setting reflects a microstructure build‐up process in paste. The microstructure formation process of fresh paste at rest has been investigated by many advanced techniques—the focused beam reflectance measurement, 25‐29 ultrasound technique, 30‐33 scanning electron microscopy, 34,35 and small‐angle neutron scattering 36 . Most published researches showed that the number and size of floc in cement paste increase with time while the porosity of paste decreases with time during setting.…”

Section: Introductionmentioning

confidence: 99%

Evolution of elastic behavior of alite paste at early hydration stages

et al. 2020

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Elastic behavior is an important aspect of fresh cement‐based materials. In this paper, the elasticity development of fresh pure alite paste within 5 hours was monitored in situ by small amplitude oscillation shear. Isothermal microcalorimetry, X‐ray diffraction, scanning electronic microscopy, 1H nuclear magnetic resonance, zeta potential measurements were used to investigate the underlying mechanisms. It was found that the evolution of storage modulus can be characterized by three different stages. The first stage stems from the compression of electrical double layer and the slight increase of solid volume fraction; the second stage is only controlled by the colloidal interaction; and the third stage is associated to the significant growth of solid volume fraction, the enhancement of short‐range attraction and the rigidification of calcium silicate hydrate (CSH) network. Moreover, the relationship between the formation of CSH and the growth of elasticity was also quantified.

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Einfluss erhöhter Frischbeton‐ und Umgebungstemperaturen auf die Betoneigenschaften

Beyer,

Neumann,

Schack

et al. 2024

Beton und Stahlbetonbau

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Der Einfluss des Klimawandels äußert sich in einer stetigen Zunahme an sommerlichen Hitzetagen, wodurch die Wahrscheinlichkeit für das Auftreten erhöhter Frischbetontemperaturen (>30 °C) während der Herstellung und des Einbaus von Beton erheblich zunimmt. Derartige klimatische Randbedingungen stellen für den Betonbau eine Herausforderung dar, da ohne energie‐ und CO2‐intensive Gegenmaßnahmen, wie z. B. Kühlung der Ausgangsstoffe, ein ungewollt hoher Anstieg der Temperatur des Betons bei der Verarbeitung und Erhärtung unausweichlich ist. Dies führt zu einer Beeinflussung der Hydratation, was sich für gewöhnlich in einem beschleunigten Abfall der Verarbeitbarkeit und einer Reduktion der mechanischen Eigenschaften und der Dauerhaftigkeit äußert. Zielsetzung des vorliegenden Beitrags ist es, ein besseres Verständnis des Einflusses erhöhter Frischbetontemperaturen auf die zuvor genannten Eigenschaften zu gewinnen. Weiterhin wurde der Einfluss der Umgebungstemperatur bis zum Betonalter von drei Tagen auf die Betoneigenschaften untersucht. Hierbei wurden Temperaturen bis zu 40 °C betrachtet.

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Early hydration and microstructure formation of Portland cement paste studied by oscillation rheology, isothermal calorimetry, 1H NMR relaxometry, conductance and SAXS

Cited by 59 publications

References 32 publications

The Influences of Cement Hydration and Temperature on the Thixotropy of Cement Paste

The Influences of Cement Hydration and Temperature on the Thixotropy of Cement Paste

Evolution of elastic behavior of alite paste at early hydration stages

Einfluss erhöhter Frischbeton‐ und Umgebungstemperaturen auf die Betoneigenschaften

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