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Structure and properties of modified gypsum binder

G.I. Yakovlev (Kalashnikov Izhevsk State Technical University, Izhevsk, Russian Federation)
A. Gordina (Kalashnikov Izhevsk State Technical University, Izhevsk, Russian Federation)
Rostislav Drochytka (Brno University of Technology, Brno, Czech Republic)
A.F. Buryanov (Department of Civil Engineering, National Research University of Moscow, Moscow, Russian Federation)
Olga Smirnova (Department of Constructing Mining Enterprises and Underground Structures, Saint Petersburg Mining University, Sankt-Peterburg, Russian Federation)

Smart and Sustainable Built Environment

ISSN: 2046-6099

Article publication date: 9 July 2020

Abstract

Purpose

The purpose of the study is regarding the development of eco-oriented technologies for obtaining the building gypsum materials with the involvement of industrial by-products or waste.

Design/methodology/approach

The scanning electron microscopy, X-ray microanalysis and IR spectral analysis were used to study the structure of gypsum matrix. The method of comparison of modified and unmodified gypsum matrix was used. Physical modeling of gypsum matrix crystallization is used to study changes in the morphology of hydration products.

Findings

The experimental results show that the addition of technical soot into a gypsum binder leads to a change in the morphology of crystalline hydrates of calcium sulfate dihydrate. Results of the scanning electron microscopy, X-ray microanalysis and IR spectral analysis confirm the change of physical and mechanical characteristics of the gypsum binder due to the structural modification of the gypsum matrix with ultrafine carbon soot. The achieved degree of the structural modification of the gypsum matrix is compatible with the results obtained when the gypsum binder was modified with dispersions of carbon nanotubes.

Originality/value

The morphology of the crystalline hydrates of the gypsum matrix with the addition of 0.04%, 0.06% and 1% of the carbon soot is characterized by the transition of the classical needle-like structure of gypsum dihydrate to the lamellar structure of increased density. One can observe the formation of intergrowths around ultrafine carbon soot particles. The studied carbon additive can improve strength characteristics of the gypsum matrix.

Keywords

Acknowledgements

The reported study was funded by RFBR and Czech Science Foundation according to the research project No. 19–53-26011.

Citation

Yakovlev, G.I., Gordina, A., Drochytka, R., Buryanov, A.F. and Smirnova, O. (2020), "Structure and properties of modified gypsum binder", Smart and Sustainable Built Environment, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/SASBE-04-2020-0037

Publisher

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Emerald Publishing Limited

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