Hydroxyethyl methyl cellulose as a modifier of gypsum properties

Mróz, Patrycja; Mucha, Maria

doi:10.1007/s10973-018-7238-3

Cited by 16 publications

(13 citation statements)

References 18 publications

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“…The main goal of using polymers in gypsum slurry is the modification of setting process, which involves gypsum hydration/crystallization and final structure of gypsum matrix [4]. Based on the application in cements, Pouches revealed that polymers had the considerable influence on hydration delay [5].…”

Section: Introductionmentioning

confidence: 99%

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Powała

Heim

2019

Latvian Journal of Physics and Technical Sciences

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The paper presents an experimental study of five different gypsum composites taking into account paraffin permeability. The composites consist of synthetic gypsum, paraffin and polymers. The samples were produced from gypsum slurry of mixing ingredients, all in the liquid state. After 7 days of maturing, the condition of the samples was assessed as well as drying time was determined. In the second part, the paraffin tightness of different samples was analysed. The results showed that after three weeks of tests the tightness sample was A4. Other polymers were characterised by lower tightness. The content of polymer had also the effect on the final results, but the direct relation between polymer content and paraffin tightness was not observed.

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Section: Introductionmentioning

confidence: 99%

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Powała

Heim

2019

Latvian Journal of Physics and Technical Sciences

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“…Certain information is available on the effect of water-soluble polymers on the microstructural formation of cementitious materials [1][2][3]. During the hydration of calcium sulfate hemihydrate, calcium sulfate dihydrate (gypsum plaster) is formed.…”

Section: Introductionmentioning

confidence: 99%

“…Previous results also proved the influence of other watersoluble polymers on the setting induction time, the rate of hydration as well as certain mechanical and thermal properties of the final product. The cellulose derivatives are found to be suitable retardant additives for the modification of gypsum setting [2,8].…”

Section: Introductionmentioning

confidence: 99%

Microstructural formation of gypsum by setting in the presence of hydroxypropyl methylcellulose (HPMC)

Mucha

Mróz

Wrona

et al. 2020

J Therm Anal Calorim

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The role of a polymer as a retarder additive is to enhance workability of the gypsum paste by modifying its setting process and to improve its properties. The study focuses on the influence of water-soluble cellulose derivative hydroxypropyl methylcellulose (HPMC) on the setting kinetics as well as on the properties and the microstructure of gypsum. The influence of HPMC (used in mass fractions of up to 1.5%) on the kinetics of crystallization/hydration of hemihydrate calcium sulfate was investigated by heat flow measurements using differential scanning calorimetry (DSC). To describe the experimental results, the Avrami equation was used and its parameters n and K were determined. The hydration/crystallization process was modified by the presence of the polymer. As a result, the K value decreased, but n ≈ 2.5 pointed to the three-dimensional diffusion-controlled mechanism. The morphology studies involved porosity measurements. Mechanical properties of the gypsum plaster composites were examined using the bending strength test and correlated with the sample microstructure.

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“…Gypsum has low plastic resistance and may suffer fractures when subjected to the tractive effort because of its covalent and ionic bonds, which give greater force and proximity to the molecules. Many studies [1][2][3][4][5] have been made using gypsum-based composite materials (GBCM) with polymers with the goal of enhancing its performance. The polymeric materials have extensive chains composed of repetitions of units that are joined by weak Van der Waals bonds 6,7 , giving greater flexibility than the ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

et al. 2019

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Studies on gypsum modified by polymers have been conducted to assess the potential of improvement in the mechanical performance, water resistance and increasing the setting time, facilitating its handling. Gypsum-based compounds made with different additions of redispersible polymers were studied, such as: ethylene-vinyl acetate (EVA), vinyl acetate terpolymer, vinyl laurate and vinyl chloride (VA/VL/VC), and vinyl acetate and vinyl versatate (VA/VeoVA). The influence on setting time, microstructural formation and on the bending performance was assessed, as well as and compression of the hardened gypsum. The composites were prepared using a polymer concentration of 5% and 10%, and water/gypsum ratio of 0.6. The addition of the polymer decreased the structural robustness and change in the microstructure. We concluded that the reduction in the amount of water through additives may allow a more complete and robust training of gypsum crystals and compounds with better mechanical performance.

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Hydroxyethyl methyl cellulose as a modifier of gypsum properties

Cited by 16 publications

References 18 publications

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Microstructural formation of gypsum by setting in the presence of hydroxypropyl methylcellulose (HPMC)

Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

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