Effect of MHEC on evaporation and hydration characteristics of glue mortar

Faiyas, A.P.A.; Erich, Sjf Sebastiaan; Huinink, HP Henk; Adan, Ocg Olaf; Nijland, T.G.

doi:10.1016/j.cemconres.2016.01.010

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…Our aim is to understand the contribution of transport processes of MHEC on drying mortar, which is driven by water transport. In previous studies, we have studied transport processes in reactive media, [2] which make interpretation quite challenging. To only investigate the effect of transport process of MHEC on the distribution, a nonreactive model is needed.…”

Section: Introductionmentioning

confidence: 99%

Transport of a water-soluble polymer during drying of a model porous media

et al. 2017

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This article presents an experimental investigation on transport of methylhydroxyethylcellulose (MHEC) during drying of a model porous material. Nuclear magnetic resonance imaging and thermogravimetric analysis are used to measure water and MHEC transport, respectively. MHEC is added to glue mortars to increase open time, i.e., the time period during which tiles can be applied with sufficiently good adhesion. Previous work showed that MHEC promotes a receding front during drying and therefore leads to differences in the degree of hydration throughout the mortar sample, i.e., the top surface shows poor hydration and the bottom surface shows good hydration. In this study, we investigate the transport of MHEC during drying of a model porous material, consisting of packed glass beads saturated with an aqueous MHEC solution. At MHEC concentration less than 1.3 wt%, homogeneous drying is observed, enabling advective transport of MHEC toward the drying surface. In this case, accumulation of MHEC may form a skin at the top surface and below this skin layer, a gel zone may form, which allows migration of water toward the evaporation surface. When the MHEC concentration is above 1.3 wt%, front receding drying is observed, which prevents transport of MHEC, resulting in a more homogeneous distribution of MHEC. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Transport of a water-soluble polymer during drying of a model porous media

et al. 2017

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“…Bülichen et al [2] studied methyl hydroxyethyl cellulose (MHEC) water retaining ability and identified two effects: the water sorption and the formation of a hydrocolloidal associated 3D polymer network, which may be the barrier that is reducing the rate of skin formation. Results from Jenni et al [4], Bühler et al [5] and Faiyas et al [32] also indicated the formation of a polymer film at the granular structure. Jenni et al [4] observed polymer enrichment at mortar's surface due to water flow towards the surface with evaporation and skin formation, while Zurbriggen et al [6] concluded that the flow of water towards the evaporation front did not only transport organics, but also cementitious ions which did enrich the evaporation front and locally caused early precipitation of hydrates and carbonates.…”

Section: Figure 7 1d Mri Results -1 St Echo Map Signal Vs Time Of Adh...mentioning

confidence: 91%

“…Recent studies have been exploring the technique as Fourmentin et al [31] that evaluated the liquid transfer between a cement paste and a porous media with nuclear magnetic resonance (NMR). Faiyas et al [32] evaluated moisture distribution and hydration characteristics of adhesive mortars with MRI and NMR. Jarny et al [33] even combined rheological measurements and MRI technique simultaneously, hence following cement paste liquid to solid transition.…”

Section: Magnetic Resonance Imaging (Mri)mentioning

confidence: 99%

Skin formation in adhesive mortars evaluated by MRI and interfacial rheology

Yamagata

Cardoso

Sarou‐Kanian

et al. 2019

Cement and Concrete Composites

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“…To this end, a sufficient understanding of the impact of temperature gradients on drying kinetics in nonisothermal drying processes is critical. Also, in the drying processes encountered in many natural or engineering situations, the liquid phase contains dissolved species, i.e., dissolved salts [5], polymers [6], or particles such as in colloidal suspensions [7]. Control of the final distribution of these species after drying can be essential.…”

Section: Introductionmentioning

confidence: 99%

Temperature gradient induced double stabilization of the evaporation front within a drying porous medium

2018

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This is an author's version published in: http://oatao.univ-toulouse.fr/21468 To cite this version:Vorhauer, Nicole and Tsotsas, Evangelos and Prat, Marc Temperature gradient induced double stabilization of the evaporation front within a drying porous medium. (2018) Physical Review Fluids (3). 1-24. ISSN 2469-990X Official URL:https://doi.Drying of porous media very often occurs in the presence of significant temperature gradients because heat fluxes are imposed in many situations in order to decrease the drying time or to facilitate the moisture removal at a higher humidity of the surrounding gas phase. Here we consider the situation where the temperature increases with depth. We show from experiments with a micromodel that the temperature gradient induces the stabilization of the evaporation front within the model porous medium according to two different mechanisms occurring consecutively. The first mechanism occurs in the liquid phase and is explained by the dependence of surface tension upon temperature. This results in the preferential invasion of the warmer zones. The second mechanism occurs gas-sided due to the dependence of saturation vapor pressure upon temperature. We show that the time scales of both mechanisms are different leading to the temporary formation of distinctive phase patterns from which different periods of drying can be discriminated.

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Effect of MHEC on evaporation and hydration characteristics of glue mortar

Cited by 13 publications

References 17 publications

Transport of a water-soluble polymer during drying of a model porous media

Transport of a water-soluble polymer during drying of a model porous media

Skin formation in adhesive mortars evaluated by MRI and interfacial rheology

Temperature gradient induced double stabilization of the evaporation front within a drying porous medium

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