Currently, when designing various residential buildings, there has been a tendency to use monolithic reinforced concrete to cover significant spans, often using structures with a complex geometric structure. This article proposes a methodology for calculating the permissible load on the scaffold racks from the conditions of strength and stability using the classical approaches of materials mechanics and structural mechanics for this purpose, in order to optimize the consumption of materials and to identify real “steps” of racks horizontally and vertically, while observing the requirements for such structures for strength and stability. Cases of non-standard arrangement of outside scaffold racks of monolithic slab’s formwork are considered.

This paper presents the results of studying a set of equipment including a centrifugal mill and a separator. It presents data on the plant’s design and operation, defines a rational shape of the working surface of the mill’s accelerating discs providing highly effective collision of particles moving in oncoming flows. As a result of theoretical studies, we established that the generatrix of such a surface should have the form of a logarithmic curve. Experimental studies have shown that the best quality of the plant operation is achieved with certain combinations of parameters, such as rotor speed, the distance between the ends of rotating rotors, and the air flow rate.

The paper considers a system for optimizing the recycling process of mineral raw material waste in terms of the target function, which takes into account economic, technological, and environmental criteria. We have suggested a structural model of the production process of mineral raw material recycling using cost flows. Based on the analysis of this model, we concluded on the need to develop new methods for assessing and choosing the parameters of the equipment used, including specific performance criteria to assess the degree of sophistication of the systems under study.

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