Viscosity and water demand of limestone- and fly ash-blended cement pastes in the presence of superplasticisers

Burgos-Montes, Olga; Alonso, M.M.; Puertas, Francisca

doi:10.1016/j.conbuildmat.2013.07.008

Cited by 46 publications

(18 citation statements)

References 26 publications

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“…As the particle contents increases, the value of dynamic viscosity,

, also increases [ 1 ]. If these systems are considered homogenous suspensions, the Krieger–Dougherty equation [ 1 , 2 ] gives the dynamic viscosity from the volume fraction of cement particles, which may be obtained from the water/cementitious materials relationship,

[ 3 ]. The interest and application of the Krieger–Dougherty equation in these suspensions are due, from a theoretical point of view, to its robustness and the fact that its parameters have a physical significance [ 1 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Much research has been performed on the rheology of the various types of cement suspensions in which the suitability of this equation for the calculation of dynamic viscosity has been verified [ 2 , 4 , 5 , 7 , 8 ]. In addition, a comparison has been made of the values calculated with the experimental measures performed with rheometers, thereby obtaining good results with cement pastes with and without superplasticizer admixtures [ 1 , 3 ]. The Krieger–Dougherty equation [ 1 , 2 , 6 ] depends on two parameters: the maximum packing fraction,

, and the intrinsic viscosity,

.…”

Section: Introductionmentioning

confidence: 99%

“…The first is a measurement of the maximum packing that may be reached in a particle system, i.e., the maximum concentration of particles that can be added while maintaining some flowability. It depends on the dispersion conditions, on the shape of the particles and, especially, on their distribution and size [ 3 , 6 ]. The second measures the individual effect of the particles on the viscosity and is secondary to their form [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calculation of Dynamic Viscosity in Concentrated Cementitious Suspensions: Probabilistic Approximation and Bayesian Analysis

et al. 2021

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We present a new focus for the Krieger–Dougherty equation from a probabilistic point of view. This equation allows the calculation of dynamic viscosity in suspensions of various types, like cement paste and self-compacting mortar/concrete. The physical meaning of the parameters that intervene in the equation (maximum packing fraction of particles and intrinsic viscosity), together with the random nature associated with these systems, make the application of the Bayesian analysis desirable. This analysis permits the transformation of parametric-deterministic models into parametric-probabilistic models, which improves and enriches their results. The initial limitations of the Bayesian methods, due to their complexity, have been overcome by numerical methods (Markov Chain Monte Carlo and Gibbs Sampling) and the development of specific software (OpenBUGS). Here we use it to compute the probability density functions that intervene in the Krieger–Dougherty equation applied to the calculation of viscosity in several cement pastes, self-compacting mortars, and self-compacting concretes. The dynamic viscosity calculations made with the Bayesian distributions are significantly better than those made with the theoretical values.

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“…As the particle contents increases, the value of dynamic viscosity,

Section: Introductionmentioning

confidence: 99%

, and the intrinsic viscosity,

.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calculation of Dynamic Viscosity in Concentrated Cementitious Suspensions: Probabilistic Approximation and Bayesian Analysis

et al. 2021

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“…Not all mineral additions can be used to this end. For example, this can be achieved using fly ash but not limestone [38] or nano-CaCO 3 [39].…”

Section: Mineral Additions Influencementioning

confidence: 99%

Rheological Behavior of Fresh Cement Pastes

Rubio-Hernández

2018

Fluids

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Rheology of a concrete is mainly controlled by the rheological behavior of its cement paste. This is the main practical reason for the extensive research activity observed during 70 years in this research subfield. In this brief review, some areas of the research on the rheological behavior of fresh cement pastes (mixture method influence, microstructure analysis, mineral additions influence, chemical additives influence, blended cements behavior, viscoelastic behavior, flow models, and flow behavior analysis with alternative methods) are examined.

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“…The highest strength values were observed for NBS1 samples which revealed the lowest porosities and its changes were compatible with porosity variations. The strength activity index (SAI) was found [41] with Equation (1) …”

Section: Compressive Strengthmentioning

confidence: 99%

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Saraya¹,

Bakr²

2015

MSCE

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The aim of the present work is to study the effect of Nano-barium sulfate additions on the physicomechanical properties of hardened cement pastes. Nano-barium sulfate was prepared by the precipitation method. Eight mixes of filled cement pastes containing 0.5 wt%, 1.0 wt%, 1.5 wt% and 2.0 wt% of both nano-barium sulfate and micro-limestone were prepared and compared to the base OPC. The hydration characteristics were evaluated by the measure of combined water content, bulk density, total porosity and compressive strength for samples hydrated up to 90 days. The progress of hydration reactions was followed up by XRD analysis. The morphology and microstructure were studied by SEM. Nano-size barium sulfate acted as a nucleating agent and enhanced the hydration of cement pastes up to 2.0% mass content. Also, the microstructure was improved considerably. Accordingly, nano-size barium sulfate can be used successfully in the preparation of filled cement.

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Viscosity and water demand of limestone- and fly ash-blended cement pastes in the presence of superplasticisers

Cited by 46 publications

References 26 publications

Calculation of Dynamic Viscosity in Concentrated Cementitious Suspensions: Probabilistic Approximation and Bayesian Analysis

Calculation of Dynamic Viscosity in Concentrated Cementitious Suspensions: Probabilistic Approximation and Bayesian Analysis

Rheological Behavior of Fresh Cement Pastes

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

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