The Development of Composite Nanostructured Gypsum Binder with Enhanced Heat Resistance Performance

• Published in: Materials science forum Vol. 945; pp. 293 - 298
• Main Authors: Alehin, D.A., Kozhukhova, M.I., Cherevatova, Alla V., Zhernovskaya, I.V.
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 01.02.2019
• Subjects: Gypsum; Heat resistance; Temperature; Thermal resistance; Polycondensation-Polymerization Mechanism; Gypsum Binder; Structure Formation; Phase Formation; Nanostructured Binder
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.945.293

The subject of this study was an experimental confirmation of stability of composite nanostructured gypsum silicate binder (CNGSB) system under high-temperature exposure (up to 1000 °C). The hypothesis of the heat-resistance performance of gypsum-based binder was crystallization process in CNGSB system involving a silicate constituent as a reactive component in NB. XRD and DTA analyses demonstrated that thermal exposure of CNGSB to wide range of temperatures of 20–1000 °C leads to α-quartz to β-quartz phase transformation in the binder; amorphous alkali-aluminosilicate (gel) changes to crystal phase of Са-albite. The calculation of cell volumes characteristics for low-temperature (before thermal exposure) and high-temperature (after thermal exposure) phases was performed. The calculated ratios of unit cell volumes were close to 1 which ensures a structural stability of the GNB under thermal exposure and confirms its heat-resistant performance.