Plaster Hydration at Different Plaster-to-Water Ratios: Acoustic Emission and 3-Dimensional Submicrometric Simulations

Lemarchand, A.; Boudoire, Florent; Boucard, Élodie; Chotard, Thierry; Smith, Agnès

doi:10.1021/jp210601a

Cited by 13 publications

(28 citation statements)

References 37 publications

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“…The hydration reaction can be described as the successive dissolution of hemihydrates (CaSO 4 , ½ H 2 O, initial water-to-powder ratio of 0.8) and precipitation of dihydrates (CaSO 4 , 2 H 2 O) in water [1][2][3][4]. Detailed information on these processes may be found in [5][6]. After this chemical reaction which lasts about 40 min without accelerators [7], a significant excess of water must be removed from the material, an operation which requires a lot of energy.…”

Section: Introductionmentioning

confidence: 99%

Subflorescence and plaster drying dynamics

Seck

Keita

Faure

et al. 2016

Chemical Engineering Science

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The dynamics of plaster drying and the impact of subflorescence on the process are described through Magnetic Resonance Imaging and X-Ray Microtomography measurements. It is shown that crystals deposit around the air-liquid interface the closest to the sample free surface, which induces a recession of this interface within the sample at a rate only depending on the current saturation (water to pore volume ratio). Thus the distribution of crystals deposited during evaporation essentially depends on the history of saturation. The drying dynamics then results from vapor diffusion through the less porous layers of crystal accumulation below the sample free surface. This in particular makes it possible to predict the dramatic decrease of the drying rate after successive imbibition-drying cycles.

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Section: Introductionmentioning

confidence: 99%

Subflorescence and plaster drying dynamics

Seck

Keita

Faure

et al. 2016

Chemical Engineering Science

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“…Hereafter, the cement stone is compacted due to the ongoing reactions of interaction between cement and water, partial dehydration and further crystallization. A detailed description of the process is available in [ 2 O. The hydroaluminate is bonding by the addition of natural gypsum, and the hydroferrite becomes a part of the cement gel.…”

Section: Resultsmentioning

confidence: 99%

“…Mechanism of the cementing substances setting and stiffening is based on exothermal processes of interaction with water. As a result the water-cement paste transform into a dense stony material [1][2]. Method for registration of the acoustic oscillations induced during the heterophase transitions holding in liquid medium was proposed for the considered processes investigation (method of acoustic emission (AE)).…”

Section: Introductionmentioning

confidence: 99%

“…Method for registration of the acoustic oscillations induced during the heterophase transitions holding in liquid medium was proposed for the considered processes investigation (method of acoustic emission (AE)). Various authors [2][3][4][5] pay attention to the efficiency of AE-method coupled with optical method and computer simulation of crystals forming during the gypsum CaSO 4 ·0,5Н 2 О and water interaction.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the ultrasonic sound signals during the cementing materials induration

et al. 2017

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Abstract. The paper is devoted to investigation mechanism of cement mixture setting and stiffening. Method for registration of the acoustic oscillations induced during the heterophase transitions executing in liquid medium was proposed (method of acoustic emission (AE)). Using of conical vessel serving as a resonator allows the amplification of registered acoustic signal and provides high sensitivity of the registration. The experimental results show that the using of AE-method allows remote monitoring of the dynamics of concrete mixtures condition during setting. Therefore, this method can be successfully applied in building as a nondestructive method for determining the start and end of the solidification of the cement solution.

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“…To this end, an astonishing variety of additives have been tried in order to control the kinetics of the reaction while improving the mechanical properties of the resulting product [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Electrical conductivity [2,18,19], calorimetry [20,21], acoustic emission [13,22] and Raman spectroscopy [23] have been used to follow the dynamics of the reaction. The nanoscale structure of the material has been characterized [24,25], including by nuclear magnetic resonance (NMR) [26] and cryogenic transmission electron microscopy [27].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of plaster hydration and structure of gypsum: Experiments and kinetic Monte Carlo simulations with added gypsum seeds

Morgado

Masurel

Rhodes

et al. 2019

Journal of Crystal Growth

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Experiments and simulation results are compared in order to make precise the conditions optimizing both the kinetics of plaster hydration and the structure of the resulting material. Calorimetry experiments performed for different amounts of added gypsum seeds are used to assign values to the simulation parameters controlling kinetics, e.g. time step, surface density of gypsum germs on plaster grains. Simulation provides a reliable quantity to follow the beginning of setting, the fraction of gypsum needles belonging to a percolating cluster, as proven by comparing its evolution with the one of the elastic modulus during shear experiments. The simulations reveal that the beginning of needle growth may be hindered by two many small plaster grains, whereas big plaster grains slow down the end of the reaction. We suggest to add gypsum germs with an m g /m p = 0.002 gypsum-to-plaster mass ratio in order to optimize homogeneity of the final material.

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Plaster Hydration at Different Plaster-to-Water Ratios: Acoustic Emission and 3-Dimensional Submicrometric Simulations

Abstract: International audienc

Cited by 13 publications

References 37 publications

Subflorescence and plaster drying dynamics

Subflorescence and plaster drying dynamics

Investigation of the ultrasonic sound signals during the cementing materials induration

Kinetics of plaster hydration and structure of gypsum: Experiments and kinetic Monte Carlo simulations with added gypsum seeds

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