Abstract
The paper assesses the influence of the calcination temperature of synthetic gypsum binder on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars. The calcination process of gypsum binder was carried out at four different temperatures ranging from 170 to 190 °C. The specimens for testing were prepared on the basis of the obtained raw material with a constant water to gypsum ratio of w/g = 0.75. It was noted that the calcination temperature influenced the setting time of the gypsum. Based on synthetic gypsum, mixtures of masonry and plastering mortars modified with tartaric acid and Plast Retard were designed. During the experiment, the particle diameter distribution of aqueous suspensions of building and synthetic gypsum particles (before and after calcination) was determined using the Fraunhofer laser method. The dimensions of the obtained artificial gypsum grains did not differ from the diameters of the gypsum grains in the reference sample. On the basis of the conducted research, it was found that the waste synthetic gypsum obtained in the flue gas desulphurization process met the standard conditions related to its setting time. Therefore, it may be a very good construction substitute for natural gypsum, and consequently, it may contribute to environmental protection and the saving and respecting of energy.
Highlights
Gypsum is a commonly used building material
On the basis of the collected measurement data, it was found that very high repeatability was obtained in subsequent measurements for the building gypsum (Figure 3a) and the synthetic gypsum before calcination (Figure 3b)
For the proposed compositions of gypsum pastes (Table 4), measurements of their setting time were made based on the temperature calcination of the synthetic gypsum (Figure 9)
Summary
The development of the construction industry and the growing demand for more and more ecological and perfect building materials has led to the searching for new solutions to improve these materials. Gypsum can be modified with the use of various chemical additives. Such additives can be, among others, accelerants, retarders, glass fibers, cellulose fibers, vermiculite, aerogels, microspheres polymers, and copolymers [2,3,4,5,6]. Among others, accelerants, retarders, glass fibers, cellulose fibers, vermiculite, aerogels, microspheres polymers, and copolymers [2,3,4,5,6] All such modifications affect the properties of gypsum composite and its application
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