Properties of building gypsum treated using the vortex layer apparatus

摘要

It is acknowledged that the physical processing of substances is often accompanied by increased intensity of the physico-chemical processes at the interphase boundary. This is known as mechano-activation [1]. The influence of mechanoactivation on the physico-chemical properties of mineral binders and the performance properties of the artificial hardened products obviously depends on the type of binder. Mineral binders in which the initial structure formation is attributed to the flow of both topochemical and crystallization processes (e.g. Portland cement) feature the onset of mechanoactivation and significant positive effects when treated using a vortex layer apparatus [2]. This is The determination of how the vortex layer apparatus treatment affects the properties of mineral binders where the initial structure formation occurs by the Le Chatelier crystallization mechanism (e.g. gypsum) is of scientific and practical interest both for establishing the advantages of mechanoactivation and for determining the operating modes of apparatuses that improve the performance properties. The crystal lattice of gypsum has a layered structure. Water molecules are distributed layer-by-layer between bi-layer packets of CaSO_4, which is characterized by perfect cleavage in this direction. Moreover, each water molecule binds the Ca~(2+) ion with two O~(2-) ions, one of which is located in the next layer. The water molecules are arranged between the layers and are thus better separated from the gypsum crystals [4].