Artificial aging of gypsum binder in terms of thermodynamics

[摘要] Aging - is the process of improvement and stabilization of plaster binder properties. The effect of the process is determined by its conditions - the duration and relative humidity of the environment. It has been detected that a reduction of a specific surface area of plaster binder occurs by aging. This is related to the formation of nuclei of calcium sulfate dihydrate on the surface of the initial binding material. As a result of aging, the strength properties of gypsum stone have increased. The largest increase occurs in 3 days of aging at the relative humidity of 80%. The studied thermodynamic analysis of the process has showed that the most significant change of the primary structure of gypsum stone occurs under the conditions of aging. By the hardening of the binding material it leads to the formation a of thermodynamically stable and ordered structure of the artificial stone.

[发布机构] Department of Construction Production, Institute of Construction Architecture and Art, Nosov Magnitogorsk State Technical University, Lenin Avenue, 38, Magnitogorsk; 455000, Russia^1

[学科分类] 土木及结构工程学

[关键词] Binder properties;Calcium sulfate dihydrate;Ordered structures;Primary structures;Process of improvement;Strength property;Thermo dynamic analysis;Thermodynamically stable