Porosity factors of fired brick based on technogenic raw materials

Purpose. To obtain optimum porosity of fired brick through the modification with technogenic mineral systems. . Methodology. A study of micro- and macroporosity was carried out in Germany through the use of a mercury porosimeter Pascal 140 and 440 Protec. Findings. Studies established that for obtaining a composition based on loam, ferrous wastes, AND sludge from the Central Aeration Station (CAS) safe porosity is 50,18 % of total porosity. For fired brick based on wastes from Volnogorsk Mining and Metallurgical Combine (VMMC), sludge from the CAS and ferrous wastes porosity is 78,11 %. Originality. It has been found that an increase in the content of better CAS sludge causes a decrease in the number of safe pores. For a ternary composition based on loam, sludge and ferrous wastes total porosity is 30 %. Complete substitution of loam with VMMC wastes, CAS sludge and ferrous wastes leads to a better safe porosity compared to a composition based on loamy raw materials. At reducing sludge content, i.e. increasing VMMC waste percentage safe porosity increases. Total porosity of a sample fired at a temperature of 850 о С is 25,61 %. Practical value. Based on the conducted fired brick tests results, 100 and 200 grade bricks with frost resistance of 25 and 35 cycles have been obtained.