Open AccessEFFECT OF GYPSUM ADDITIVE ON QUALITY OF COMPOSITIONAL BINDING MATERIALS CELLULAR STRUCTURE
Author(s) -
Anastasiya Ozherel'eva,
Anastasiya Ozherel'eva,
Н. Кудеярова,
Nina Kudeyarova
Publication year - 2019
Publication title -
vestnik bgtu im. v.g. šuhova
Language(s) - English
Resource type - Journals
ISSN - 2071-7318
DOI - 10.34031/article_5d0a380978a0d8.85307277
Subject(s) - gypsum , lime , exothermic reaction , materials science , dehydration , chemical engineering , crystallization , autoclave , anhydrite , chemistry , metallurgy , organic chemistry , biochemistry , engineering
The effect of gypsum additives on the process of lime slaking and the quality of the composite binder is discussed. It is established that a different water-solid ratio, the water temperature and the use of an additive of natural gypsum can regulate the rate of the lime slaking process. The effect of this additive on the kinetics of the process, the temperature factor, the dispersion of the product and the quality of the products obtained by slaking are considered. During the hydration of highly active lime, the slaking temperature reaches high values, at which the process of gypsum dehydration begins. The combination of the exothermic process of lime slaking and the formation of a medium of saturated water vapor with the addition of natural gypsum to lime forms the semi-aquatic gypsum СаSО4∙0,5Н2О. It does not dehydrate, does not become insoluble and retains its chemical properties. There is no exothermic effect of crystallization of anhydrite. Strength results of composite binder cellular structure demonstrate that lime-based binder samples with the addition of natural gypsum under autoclave conditions are more solid than binder-free samples.