Influence of modified calcium sulfate hemihydrate whisker on the physical, mechanical, and microscopic properties of gypsum matrix composites

Wang, Duoming; Chen, Chang; Wang, Yanlei; Jiu, Shaowu; Chen, Yanxin

doi:10.1016/j.conbuildmat.2023.132280

Cited by 9 publications

(1 citation statement)

References 54 publications

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“…inert and non-toxic, and are quite cheap. This allows them to be used as promising reinforcing filler in various structural and building composites, based on polymer matrices, plastics and building concretes [7][8][9][10][11][12][13][14][15][16]. According to [7], embedding of needle-shaped CaSO 4 crystals into PVC polymer leads to an increase in mechanical bending strength up to 113.2 MPa (the initial value is 86.3 MPa), i.e.…”

Section: Introductionmentioning

confidence: 99%

Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Nikulin,

Ivanov,

Nikulicheva

et al. 2024

Meas. Sci. Technol.

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A simple method for direct measurement of the mechanical strength of needle-shaped microcrystals of calcium sulfate, CaSO4, is proposed. The microcrystals with a length from 30 to 50 µm and transverse dimensions from 1 to 3 µm can act as reinforcing filler in various structural and building composites to improve their mechanical properties. The method is based on three-point bend test, adapted to microscopic objects. CaSO4 microcrystals were placed on a substrate, which was a twill weave filter mesh consisting of intertwined steel fibers with diameter of ~25 µm. Due to the twill weave, the mesh surface is characterized by a periodic distribution of protrusions and depressions. The protrusions act as supports for placing microcrystals, and the depressions provide the possibility of deformation and destruction of microcrystals under the action of increasing vertically acting force, which is applied to the microcrystal through the indenter of the dynamic ultra-micro hardness tester. The moment of destruction of microcrystals is observed in dependence of the force on the displacement of the indenter. Measured values of the mechanical strength of CaSO4 microcrystals varied in a range from ~3.5 to ~6.0 GPa. The experimental strength values are in good agreement with the values obtained from the results of numerical analysis of the stressed state formed in the volume of CaSO4 microcrystals during a three-point bend test.

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Section: Introductionmentioning

confidence: 99%

Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Nikulin,

Ivanov,

Nikulicheva

et al. 2024

Meas. Sci. Technol.

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Controllable synthesis of snowflake‐like α‐calcium sulfate hemihydrate microstructures using Na₂EDTA as morphology modifier

Lv,

Gao,

Guo

et al. 2024

Asia-Pacific J Chem Eng

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In this work, snowflake‐like α‐CaSO4·0.5H2O (α‐CSH) hierarchical architectures were successfully synthesized by a facile one‐pot method in an ethylene glycol‐water system using Na2EDTA as a crystal morphology modifier. Characterization techniques including X‐ray diffraction (XRD), thermogravimetric (TG) analysis, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) confirmed the progressive morphological evolution of α‐CSH from rods to snowflake‐like structures ultimately to hexagonal plates with increased Na2EDTA concentrations. The results revealed that Na2EDTA concentration played a critical role in directing the crystallization and self‐assembly of α‐CSH, and a mechanism is proposed where Na2EDTA modulated crystal orientation through preferential adsorption and regulated the driving forces between ion‐mediated crystallization and particle‐mediated assembly. This work puts forward a simple yet effective strategy for facilely regulating the morphology of α‐CSH microstructures, which could potentially expand their applications across diverse fields such as composites, construction, biomedicine, and drug delivery.

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Calcium Sulphate Whiskers (CSW) an innovative material for civil engineering applications: A critical review of its preparation, characterization, current trends, and prospects

Aakriti,

Bhardwaj,

Maiti

et al. 2024

Construction and Building Materials

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Influence of modified calcium sulfate hemihydrate whisker on the physical, mechanical, and microscopic properties of gypsum matrix composites

Cited by 9 publications

References 54 publications

Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Controllable synthesis of snowflake‐like α‐calcium sulfate hemihydrate microstructures using Na₂EDTA as morphology modifier

Calcium Sulphate Whiskers (CSW) an innovative material for civil engineering applications: A critical review of its preparation, characterization, current trends, and prospects

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Influence of modified calcium sulfate hemihydrate whisker on the physical, mechanical, and microscopic properties of gypsum matrix composites

Cited by 9 publications

References 54 publications

Mechanical strength measurement of needle-shaped CaSO4 microcrystals by a three-point bend test

Mechanical strength measurement of needle-shaped CaSO4 microcrystals by a three-point bend test

Controllable synthesis of snowflake‐like α‐calcium sulfate hemihydrate microstructures using Na2EDTA as morphology modifier

Calcium Sulphate Whiskers (CSW) an innovative material for civil engineering applications: A critical review of its preparation, characterization, current trends, and prospects

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Product

Resources

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Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Mechanical strength measurement of needle-shaped CaSO₄ microcrystals by a three-point bend test

Controllable synthesis of snowflake‐like α‐calcium sulfate hemihydrate microstructures using Na₂EDTA as morphology modifier