Yakovlev, G I; Gordina, A; Drochytka, R; Buryanov, A F and Smirnova, O (2021) Structure and properties of modified gypsum binder. Smart and Sustainable Built Environment, 10(4), pp. 702-710. ISSN 2046-6099
Abstract
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. 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. 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. 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | carbon nanotubes; ultrafine soot; gypsum binder; composite materials; nanotechnology; cement |
| Index terms: | carbon nanotube, crystallization, gypsum, spectral analysis, structural modification, scanning electron microscopy, composite, density, ultrafine, air quality, modelling |
| Subjects: | building materials, analytical methods, air quality, materials science, engineering analysis, specialized materials and systems, design process, material science and engineering |
| Topics: | Sustainability, Engineering Principles, Construction Materials, Urban Studies, Design Practice |
| Descriptive scope: | 3 PCA |
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