Improvement in Qualitative Characteristics of Pressed Products from Citrogypsum and Based Binder

Gypsum by-products are a good alternative to natural gypsum stone. However, the production of high-quality binders and materials based on them is possible only with the use of non-traditional methods and approaches that avoid the negative impact of the characteristics of gypsum-containing waste on the properties of the final product. One of these technological methods is the manufacture of products using the principles of the semi-dry pressing method. However, due to the high content of the binder component in the pressed raw mix, significant defects in the form of delaminations and wedges can occur on the surface of the products, which negatively affects not only the aesthetic but also the physical and mechanical characteristics of the products. The appearance of such defects is associated with the high adhesion of the binder to the metal surface of the mold, as well as with the near-wall friction of the particles during pressing and extrusion. In this connection, the purpose of this study was to consider the possibility of improving the quality characteristics (appearance, average density, compressive strength) of products manufactured by pressing a semi-dry raw mix. The object of research was a gypsum-containing waste from the biochemical synthesis of citric acid – citrogypsum and a binder based on it. It has been established that other things being equal, the manufacturing parameters, the introduction of a foaming agent additive in the raw mix, and the replacement of the forming surface material with plastic help to eliminate defects on the surface of the samples, as well as to ensure an increase in average density by 10%, and compressive strength by 60.6%.

N.I. ALFIMOVA¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.Yu. PIRIEVA¹, Assistant (This email address is being protected from spambots. You need JavaScript enabled to view it.);
K.M. LEVICKAYA^1,2, Postgraduate (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Belgorod State Technological University named after V.G. Shukhov (46, Kostukov Street, Belgorod, 308012, Russian Federation)
² Belgorod National Research University (85, Pobedy Street, 308015, Belgorod, Russia Russian Federation)

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