Towards a prediction of superplasticized concrete rheology

Flatt, Robert J.

doi:10.1007/bf02481674

Cited by 127 publications

(40 citation statements)

References 21 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several types of non-contact interactions occurred within a cementitious suspension [21]. The mechanism for PCE in a cement-water system mainly included electrostatic repulsion, steric hindrance and lubrication [22,23,24].…”

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

Liu

Wang

Zheng³

et al. 2014

Materials

View full text Add to dashboard Cite

A polycarboxylate superplasticizer (PCE) was synthesized in a non-solvent system with bulk polymerization and then was pulverized into powdered form to achieve a rapid transportation and convenient preparation. PCE synthesized by using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as a macromonomer exhibited the best fluidities and retaining properties at 80 °C and 75 °C, respectively. Besides, azobisisobutyronitrile (AIBN) was suitable as an initiator, and the fumaric acid was suitable as the third monomer. The test results of 1H nuclear magnetic resonance (1H NMR) confirmed the occurrences of polymerization, and the measurement results of molecular weight and distribution showed that PCE molecular weight characteristics were in accordance with their fluidity properties in cement paste. The application performances in cement showed that PCEs with the best paste fluidity retentions had the longest final setting time and the shortest setting time interval, and the PCEs with good fluidity properties can obviously delay the hydration process and lower the hydration heat. Accordingly, this is a novel, energy-saving and economical method to prepare powdered PCE in the field of concrete admixtures.

show abstract

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

Liu

Wang

Zheng³

et al. 2014

Materials

View full text Add to dashboard Cite

show abstract

“…For such materials, some authors have linked the yield stress to the material solid volume fraction (Flatt,[26]; Legrand [27]; Chateau [28]; Ildefonce et al [29]). Due to liquid filtration during extrusion, the material solid volume fraction is expected to evolve in the extruder.…”

Section: Rheological Behaviourmentioning

confidence: 99%

“…Other quoted models can be used [26][27][28][29]. The Legrand model has been used in this case for its simplicity.…”

Section: Rheological Behaviourmentioning

confidence: 99%

Extrusion Criterion for Firm Cement-Based Materials

Perrot¹,

Mélinge²,

Rangeard³

et al. 2008

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract:The stability of the flow induced by the extrusion forming process of a cement based material is largely influenced by the relative migration between the lubricating liquid phase and the granular skeleton. In the present work, we propose linking rheological concepts and soil mechanics (consolidation theory, Darcy's law) to reach a simple criterion which predicts the extrusion ability of a mortar. Extrusion tests on studied mortar are performed at different ram velocities for criterion validation. Résumé :La stabilité de l'écoulement du procédé de mise en forme par extrusion de matériaux à base cimentaire est largement influencée par la migration relative entre la phase liquide et le squelette granulaire. Dans ce travail, nous proposons de lier les concepts de rhéologie et de mécanique des sols (théorie de la consolidation, loi de Darcy) pour définir un critère simple qui prédit l'aptitude à l'extrusion d'un mortier. Des essais d'extrusion à différentes vitesses de piston sont ensuite réalisés pour valider le critère. Zusammenfassung :Die Stabilität des durch Ausstoßungsformen-Prozeß eines Zements veranlassten Flusses stützte Material ist in hohem Maße unter Einfluß der Verhältnismigration zwischen Schmieren der flüssigen Phase und granulierten Skelettes. In der gegenwärtigen Arbeit haben wir vor, rheology und Boden-Mechanik-Begriffe (Verdichtungstheorie, Gesetz von Darcy) zu verbinden, um ein einfaches Kriterium zu reichen(erreichen), das die Ausstoßungsfähigkeit des Mörsers(Mörtels) voraussagt. Ausstoßungstests auf an verschiedenem Widder durchgeführten Zementteigen.

show abstract

“…The addition of HRWRA for mix C11, C12, and C13 resulted in decreases in the yield values measured by both the ICAR rheometer and the truck. Many authors [18,19,20] have shown that concrete slump is inversely correlated to yield stress, because a high slump indicates a reduced resistance to flow as does a low yield stress. Indeed, the slump increased as the truck measurements and ICAR rheometer indicated a reduction in yield stress due to the addition of HRWRA.…”

Section: Resultsmentioning

confidence: 99%

Measurement of workability of fresh concrete using a mixing truck

Amziane

Ferraris

Koehler

2005

J. Res. Natl. Inst. Stand. Technol.

View full text Add to dashboard Cite

The main objective of this study is to evaluate the workability of fresh portland cement concrete while it is still in the mixing truck by determining fundamental rheological parameters (plastic viscosity and yield stress). Nine concrete mixtures with different values of yield stress and plastic viscosity were tested in a concrete truck. The measurements made with the truck were based on the typical method of determining the flow behavior in a traditional fluid rheometer; that is, the shear rate in the mixing truck was swept from high to low by varying the rotation speed of the drum. The results of these experiments are discussed and compared with data provided by the ICAR rheometer, a portable rheometer designed for measuring concrete rheology. The test results indicate that the mixing truck equipment is sufficiently sensitive to detect differences in yield stress, slump, and plastic viscosity. However, the plastic viscosity determined by the truck measurement did not correlate with plastic viscosity as measured by the ICAR rheometer, while the yield stress determined by the truck measurement did correlate well with the measured slump and the ICAR rheometer resultsSuggestions are given on how to improve the mixing truck for better use as a rheometer.

show abstract

Towards a prediction of superplasticized concrete rheology

Cited by 127 publications

References 21 publications

Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

Extrusion Criterion for Firm Cement-Based Materials

Measurement of workability of fresh concrete using a mixing truck

Contact Info

Product

Resources

About