Abstract. The effect of semi-dry pressing on the strength of samples has been studied. It is shown that the optimal specific pressure for pressing samples from molding mixtures containing 10, 20, 30% slag-portland cement is 30Mpa. With the help of RCCP, static processing of experimental results was carried out and a regression equation was obtained for the dependence of the strength of the samples on the pressing pressure and the content of slag-portland cement in the molding mixture. When examining the microstructure of the samples, it was found that the resulting material is a homogeneous and durable conglomerate, the crystals of neoplasms are evenly distributed over the mass and bind the sludge particles. A pilot test of the semi-dry pressing process of products has established the possibility of obtaining high-quality hollow bricks of the M100-M300 grades with a content of slag-portland cement in the mixture in the range of 10-30% (wt.). The subject of the study: sludge products of flushing the screenings of the Sharkhinsky quarry in the production of wall building materials. Materials and methods: sludge from the Sharkhinsky quarry and slag-portland cement from the Bakhchisarai cement Plant were used in the work. The structure of the samples was studied using electron scanning microscopy on a REM-106 SELMI microscope. Experimental and industrial tests were carried out on the equipment of the Aggregate company. The physical and mechanical properties of bricks and paving slabs were studied in accordance with the norms and standards established in GOST 6133-2019. Results: The microstructure of the samples was investigated and it was found that the resulting material is a homogeneous and durable conglomerate, the crystals of neoplasms are evenly distributed over the mass and bind the sludge particles. Experimental and industrial testing of the semi-dry pressing process of products from molding mixtures based on the sludge of the Sharkhinsky quarry was carried out. It was confirmed that it is possible to produce high-quality hollow bricks marked M100-M300 using slag-portland cement in a mixture in the range of 10-30% (by weight), which fully meets the requirements set out in GOST 6133-2019 Conclusions: Sludge products from the flushing of the Sharkhinsky quarry screenings can be successfully used in the production of wall building materials, which contributes to waste disposal and improvement of the ecological state of the environment. Effective methods of disposal of sludge products make it possible to obtain high-quality building materials with high physical and mechanical properties and durability.
sludge products, screenings, semi-dry pressing, wall materials, structure, properties
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