Технічна інженерія (Jun 2023)
Research on the qualitative properties of stone quarrying and stone processing waste for the purpose of using them as raw materials for the production of geopolymer concrete
Abstract
Mining and processing industries are characterized by a large amount of generated waste. In the structure of waste generation as of 2020, 96 % of the total amount belongs to waste from the mining and processing industry. That is why the development of new ways of disposal of waste from mining enterprises is an urgent scientific and practical task. The paper describes the characteristics of finely dispersed waste from stone mining and stone processing enterprises with the aim of using them as raw materials for the production of geopolymer concrete. The chemical and granulometric composition of waste from stone mining and stone processing enterprises, namely stone sludge, which is formed as a result of cutting natural stone, was studied. In contrast to waste from stone processing enterprises, sludge from stone mining enterprises is characterized by a stable chemical composition. This is explained by the fact that stone processing enterprises process natural stone from various deposits that have an excellent mineralogical and chemical composition, natural stone from the same deposit have similar mineralogical and chemical composition. Since the Si/Al ratio, which must be greater than 3, is important for the manufacture of geopolymers, the chemical composition of sludge from stone processing enterprises that process various rocks was analyzed. Studies have shown that the Si/Al ratio is greater than 3. Research has established [35] that 80-90 % of the particles in the fly ash composition for the production of geopolymer concrete should have a size of less than 45 μm. Therefore, the granulometric composition of the stone sludge was given, which showed that 14 % of the particles have a size of less than 50 μm, and 79 % of the particles have a size of 50 μm to 100 μm. Whereas clay has particles with a size of less than 50 μm in the amount of 79 % and 14 % of particles with a size of 50 μm to 100 μm. The granulometric composition of sand, as a raw material used in the production of concrete, was also determined.
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