Influence of hydration on the fluidity of normal Portland cement pastes

Rößler, Christiane; Eberhardt, A.B.; Kučerová, Hana Přikrylová; Möser, B.

doi:10.1016/j.cemconres.2008.03.003

Cited by 67 publications

(29 citation statements)

References 15 publications

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“…Sample name Temperature the mixing intensity increased that the plastic viscosity and yield stress would decrease, and this has often been reported in the literature [2][3][4]7]. However, much of the reported results were based on mixtures that were examined using shearing conditions that were lower than those examined in this work.…”

Section: Mixing Methodsmentioning

confidence: 67%

“…Numerous studies have been published regarding the influence of mixing intensity on the rheological properties of cement-based mixes [2][3][4][5]; generally as the mixing intensity increases, the viscosity and yield stress of concrete decreases. In addition, the shear forces generated during mixing also influence the agglomeration strength amongst cement particles [6] and the morphology of the hydration products on the surface of cement particles [7]. Mixing intensity is affected by many factors, including, but not limited to the type of mixer, mixing speed, and mixing time.…”

Section: Introductionmentioning

confidence: 99%

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Effect of mixing method on microstructure and rheology of cement paste

Han

Ferron

2015

Construction and Building Materials

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h i g h l i g h t sInfluence of mixing intensity on rheological behaviors of cement paste was assessed. High mixing intensity can result in increasing the rheological properties. Plasticized pastes were more sensitive to effect of mixing intensity than non-plasticized pastes. Cement pastes prepared using high mixing intensity can be more agglomerated than pastes prepared using low mixing intensity. Effects of the mixing intensity also affected hydration. a b s t r a c tMixing is one of the most important processes for producing concrete. The influence of different mixing methods on the rheological properties and fresh state microstructure of cement pastes were evaluated. In this work, the mixing process of cement paste was based on two different sample preparation methods: ASTM C305 and ASTM C1738. ASTM C1738 uses a high shear mixer, whereas ASTM C305 uses a planetary mixer to homogenize cement paste. A considerable increase in the rheological properties was seen in pastes prepared using the ASTM C1738 protocol versus those prepared according to ASTM C305, especially when a superplasticizer was incorporated. Not only were the rheological properties affected, but differences in hydration kinetics and fresh state microstructure were also observed, with mixtures prepared with ASTM C1738 generally displaying more flocculated microstructural features and accelerated hydration kinetics than mixtures prepared with ASTM C305.

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Section: Mixing Methodsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effect of mixing method on microstructure and rheology of cement paste

Han

Ferron

2015

Construction and Building Materials

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“…This finding is in line with results by Uchikawa et al [18], who stated that the rheological properties of fresh cement pastes are governed in the early hydration stages by the formation of ettringite and later by C-S-H formation. Additionally, the formation of syngenite impacts the shear behavior of fresh cement pastes [19].…”

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%

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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“…Polycarboxylate superplasticizers (PCs), a wide variety of polyfunctional polyelectrolytes, play an important and irreplaceable part in modern concrete [1,2]. Normally, PCs can be prepared by copolymerization of monomers with different functional groups which include carboxylic acid group, sulfonic acid group and long side-chain [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

RP-LC Determination of Residual Monomers in Polycarboxylate Superplasticizers

Lei

Zhang

et al. 2011

Chromatographia

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A procedure was developed for the determination of residual monomers in polycarboxylate superplasticizer by reversed-phase high performance liquid chromatography. Seven kinds of residual monomers were quantitatively determined on a SinoChrom ODS-BP (C18) column and UV detector at 205 nm. The mobile phases which were used to determine micromolecular monomers were composed of acetonitrile and phosphate buffer solution (0.05 mol L -1 , pH = 3) in the ratio of 8:92 (v/v). While the mobile phases for long side-chain monomers testing were composed of acetonitrile and phosphate buffer solution (0.05 mol L -1 , pH = 6.5) in the ratio of 40:60 (v/v). The linear response ranged from 4.0 9 10 -6 -2.0 9 10 -3 mol L -1 . The detection limit was 0.12 9 10 -5 -0.8 9 10 -5 mol L -1 . Determination of real samples showed that relative standard deviation of high conversion rate samples was 3.1-8.7% and standard addition recovery ratio was 91.5-102.8%. While the relative standard deviation of low conversion rate samples was less than or close to 1% and the standard addition recovery ratio was 96.3-103.1%.

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Influence of hydration on the fluidity of normal Portland cement pastes

Cited by 67 publications

References 15 publications

Effect of mixing method on microstructure and rheology of cement paste

Effect of mixing method on microstructure and rheology of cement paste

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

RP-LC Determination of Residual Monomers in Polycarboxylate Superplasticizers

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