Stability criterion for fresh cement foams

Feneuil, Blandine; Aimedieu, Patrick; Scheel, Mario; Perrin, Jonathan; Roussel, Nicolas; Pitois, Olivier

doi:10.1016/j.cemconres.2019.105865

Cited by 42 publications

(9 citation statements)

References 18 publications

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“…Therefore, numerous works are still devoted to elucidate the link between their microstructure and their macroscopic properties, such as thermal, acoustical, mechanical, and transport properties (Despois and Mortensen, 2005;Doutres et al, 2011;Gibson and Ashby, 1997;Jang et al, 2008;Kumar and Topin, 2014). Recently, mineral solid foams, made from cement or geopolymer or gypsum, have been studied for their applications as building materials, requiring a good compromise between mechanical strength, and sound and/or thermal insulation (Chevillotte et al, 2013;Feneuil et al, 2019;Hung et al, 2014;Kaddami and Pitois, 2019;Zhang et al, 2014). This kind of solid foam differs from polymeric foams, which are widely used for sound and/or thermal insulation by both their wide range of porosity (from 0.65 to 0.95) and their highly stiff porous frames.…”

Section: Introductionmentioning

confidence: 99%

Acoustics of monodisperse open-cell foam: An experimental and numerical parametric study

Langlois

Kaddami

Pitois

et al. 2020

The Journal of the Acoustical Society of America

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This article presents an experimental and numerical parametric study of the acoustical properties of monodisperse open-cell solid foam. Solid foam samples are produced with very good control of both the pore size (from 0.2 to 1.0 mm) and the solid volume fraction (from 6% to 35%). Acoustical measurements are performed by the threemicrophone impedance tube method. From these measurements, the visco-thermal parameters-namely, viscous permeability, tortuosity, viscous characteristic length, thermal permeability, and thermal characteristic length-are determined for an extensive number of foam samples. By combining Surface Evolver and finite-element method calculations, the visco-thermal parameters of body centered cubic (bcc) foam numerical samples are also calculated on the whole range of solid volume fraction (from 0.5% to 32%), compared to measured values and to theoretical model predictions [Langlois et al. (2019). Phys. Rev. E 100(1), 013115]. Numerical results are then used to find approximate formulas of visco-thermal parameters. A systematic comparison between measurements and predictions of the Johnson-Champoux-Allard-Lafarge (JCAL) model using measured visco-thermal parameters as input parameters, reveals a consistent agreement between them. From this first step, a calculation of the optimal microstructures maximizing the sound absorption coefficient is performed. V

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Section: Introductionmentioning

confidence: 99%

Acoustics of monodisperse open-cell foam: An experimental and numerical parametric study

Langlois

Kaddami

Pitois

et al. 2020

The Journal of the Acoustical Society of America

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“…Previous works have shown that the arrest of coarsening is controled by the ratio between the Laplace pressure γ/R 32 , which drives coarsening, and the resistance of the solid interstitial network, characterized either by its yield stress σ Y [14] or its shear modulus G [53]. The first Laplace term decreases with time, at most by a factor 3 (Fig.…”

Section: B Controlling Pore Size Through Setting Timementioning

confidence: 93%

“…The fresh foam is indeed an unstable fluid structure, which evolves through the combined effects of gravity-induced drainage, ripening due to gas transfer between bubbles, and bubble fusion called coalescence [13]. More precisely, for a given setting time, Feneuil et al have shown that the stability of a cement foam is governed by the ratio between the yield stress of the fresh material, and the Laplace pressure, given by γ/R, with γ the surface tension of the solution, and R the bubble radius [14]. However, we so far do not know how this criterion evolves as the setting time is changed among various materials.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Gypsum Plaster Setting in a Foam through Raman Spectroscopy

Trosseille

Panczer²,

Martinet³

et al. 2022

Phys. Rev. Applied

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We use Raman spectroscopy to probe in situ the hydration reaction of a foamed mineral binder, here gypsum plaster. We show the strong effect of the mixing process used for foaming on the hydration kinetics. On the contrary, we observe no effect of the cationic surfactant tetradecyltrimethylammonium bromide (TTAB) used as foaming agent, and of the foam structure. By tuning the hydration timescale with a setting retardant (citric acid) and measuring in parallel the characteristic bubble radius in the foam, we show that hydration kinetics control the arrest of the bubble size evolution in the fresh foam and the final pore size in the set gypsum.

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“…Bey et al worked with monodisperse bubbles to show that, indeed, if the elastic energy of the medium is higher than the surface energy coarsening is halted 9 . Lesov et al and Feneuil et al measured an arrest once the continuous phase yield stress was higher than Laplace pressure 10 , 11 .…”

Section: Introductionmentioning

confidence: 98%

Viscoelastic coarsening of quasi-2D foam

et al. 2023

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Foams are unstable jammed materials. They evolve over timescales comparable to their “time of use", which makes the study of their destabilisation mechanisms crucial for applications. In practice, many foams are made from viscoelastic fluids, which are observed to prolong their lifetimes. Despite their importance, we lack understanding of the coarsening mechanism in such systems. We probe the effect of continuous phase viscoelasticity on foam coarsening with foamed emulsions. We show that bubble size evolution is strongly slowed down and foam structure hugely impacted. The main mechanisms responsible are the absence of continuous phase redistribution and a non-trivial link between foam structure and mechanical properties. These combine to give spatially heterogeneous coarsening. Beyond their importance in the design of foamy materials, the results give a macroscopic vision of phase separation in a viscoelastic medium.

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Stability criterion for fresh cement foams

Cited by 42 publications

References 18 publications

Acoustics of monodisperse open-cell foam: An experimental and numerical parametric study

Acoustics of monodisperse open-cell foam: An experimental and numerical parametric study

Monitoring Gypsum Plaster Setting in a Foam through Raman Spectroscopy

Viscoelastic coarsening of quasi-2D foam

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