The influence of cellulose derivatives on water structure in gypsum

Czaderna, Anna; Kocemba, Aleksandra; Kozanecki, Marcin; Mucha, Maria; Mróz, Patrycja

doi:10.1016/j.conbuildmat.2017.11.062

Cited by 18 publications

(12 citation statements)

References 29 publications

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“…It has been noticed that the presence of polymer additives changes the gypsum crystalline structure (lower rate of nucleation and more narrow crystals of dihydrate). More data collected for various values of w/g using HEMC can be found elsewhere [2,3].…”

Section: Mechanical Resultsmentioning

confidence: 99%

“…4b). It seems that the polymer molecules are incorporated in spaces between single crystals of calcium dihydrate in the interconnected parts of gypsum, improving its mechanical properties [3].…”

Section: Discussionmentioning

confidence: 99%

“…The rest is removed as free water during drying, which results in the creation of pores. When a water-soluble polymer is used as an additive, its strong affinity to water helps to make swell structures, and in the ensuing drying process a thin layer of polymeric film is created inside the pores [1,3]. The presence of polymer inside the pores changes the microstructure of gypsum, and an increase in porosity can be observed after removing the excess water from the swollen polymer.…”

Section: Kinetics Of Gypsum Crystallization/hydrationmentioning

confidence: 99%

“…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%

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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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Section: Mechanical Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Kinetics Of Gypsum Crystallization/hydrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…At the same time, Mucha et al discussed the influence of HEMC on the thermal parameters of modified gypsums. They showed that the use of this polymer in gypsum composites delayed the hydration process [8,9]. Aerogels are currently considered to be one of the most promising high-performance thermal insulation materials for building applications.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Strength Properties and Phase Transition of Gypsum Modified with Microspheres, Aerogel and HEMC Polymer

et al. 2021

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The paper presents an assessment of the impact of using additives on the strength of a binding material, i.e., building gypsum, and also the phase transformation that takes place in it. Microspheres, aerogel and polymer (HEMC) additives were added to a building gypsum slurry with a water to gypsum ratio of 0.75. In order to investigate their influence on bending strength, compressive strength, and the effect of high temperatures, differential scanning calorimetry (DSC), as well as tests of the multicomponent binder, were carried out in accordance with the applicable PN-EN 13279-2:2005 standard. The obtained test results allowed to determine that the used additives influenced the strength parameters of the obtained composites. It was shown that the applied additives decreased the compressive and bending strength of the modified gypsum. Despite these properties, the obtained gypsum materials are environmentally friendly because they reuse wastes, such as microspheres. Out of all the applied additives, the use of microspheres in an amount of 10% caused a decrease in the bending strength by only 10%, and an increase in the compressive strength by 4%.

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Modification on the Performance of the Hemihydrate Gypsum with the Plant Source Polymer of Dry Matcha Powder

Huang

et al. 2018

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The influence of cellulose derivatives on water structure in gypsum

Cited by 18 publications

References 29 publications

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

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

Changes in the Strength Properties and Phase Transition of Gypsum Modified with Microspheres, Aerogel and HEMC Polymer

Modification on the Performance of the Hemihydrate Gypsum with the Plant Source Polymer of Dry Matcha Powder

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