The existing hot water supply system of a 17-storey apartment building commissioned in 2010 is considered and its scheme is described. A laboratory study of the dismantled sections of the defective pipeline was carried out. It is shown that the entire inner surface of the pipe is covered with longitudinal cracks of uneven shape, different lengths and depths. A microscopic examination of the pipe section revealed areas of insufficient adhesion of the reinforcing layer with the inner layer of the polypropylene pipe. It is established that the main reason for the appearance of pipe defects in the form of numerous cracks, the formation of bubbles and fracture with a short service life is associated with the formation of a rupture of bonds between layers and the use of low-quality polypropylene pipes.

Keywords: pipe, polypropylene, defect, crack, swelling, water supply, reinforcing layer, technology, construction, aluminum

An analysis of the use of ceramic products in the total volume of use of wall materials is given. It is shown that with the plastic method of molding ceramic products, a change in the quality of raw materials can lead to the production of low-quality products (defective products). The basic technological properties of clay raw materials from the Taushinsky deposit in the Perm Territory, as well as its granulometric and mineral compositions, have been studied. It is shown that the adjustment of the composition of the ceramic mixture with a change in the characteristics of the feedstock should be carried out taking into account the features of mineral formation in an 8-component oxide system. A comparison of the physical and mechanical characteristics of two batches of bricks of the current and corrected compositions was made, which makes it possible, with some assumptions, to consider them identical.

Keywords: ceramics, brick, clay, deposit, optimization,batch mixture, firing, production, plastic molding method , strength