###### Abstract
For this purpose, ten blend patterns were used to prepare 210 samples with 0%, 25%, 50%, 75%, and 100% refractory brick aggregate replacements instead of natural sand. The samples were prepared on the basis of Portland and clay cement. Prior to performing strength tests, they were heated at temperatures in the range of 110-1000 \({}^{\circ}\)C. The results showed that refractory brick aggregate and aluminous cement improve the residual strength of concrete in relation to the natural aggregate. The authors of [18; 19] proved the great potential of using waste ceramic aggregate for non-structural concretes for which there are no high strength requirements, including the production of pavement slabs. The authors of [20] conducted tests to determine the possibility of using waste from floor and wall tiles as aggregates for the production of concrete. There were determined physical and chemical properties of the aggregate. The properties of the achieved concrete are compared with the properties of concrete made of limestone aggregates. It was found that the concrete produced using aggregate from crushed floor tiles has similar mechanical properties as limestone aggregate; on the other hand, concretes made of recycled aggregate from wall tiles have lower mechanical properties than limestone. The authors of [21] made samples using Portland cement and recycled aggregate from new and used wall and floor tiles. The huge number of parameters were examined including the shape of aggregate grains, the crushing index, and other parameters. There was percentage testing of natural recyclable aggregate recycling at 0% (reference concrete), 20%, 35%, 50%, 65%, 80%, and up to 100%. The compressive strength and bending strength, as well as the modulus of elasticity, were tested for the prepared samples. The obtained test results are ambiguous, however; the authors confirm that the use of recycling aggregates from wall and floor tiles for concrete is possible. In work [22], it reviews the impact on the recovered ceramic aggregate from floor and wall tiles as an aggregate for concreto. The highest compressive and tensile strength was achieved by replacing 100% of the natural aggregate with a fine ceramic aggregate. In summary, it should be emphasized that the addition of red ceramics into concrete as aggregate can be achieved primarily by replacing a coarse aggregate [23; 24; 25; 26; 27; 28] or exchanging small aggregates [29; 30; 31]. Some researchers have also investigated the possibility of using ceramic dust as a mineral supplement to concrete [32; 33]. Due to a number of factors, the obtained test results were ambiguous. In some cases, researchers even managed to increase the strength of concrete with a different percentage of natural aggregate exchange for recycling in the form of ceramics. In the study [23], researchers managed to achieve an increase in strength by about 9% when replacing with ceramic aggregate only in 9%. In the study [29], an increase in compressive strength of about 7% was achieved with 5% replacement. In other studies [30; 31], an increase in strength by 8-9% was also noted but with the complete replacement of the aggregate with RCA ceramic material. There is also carried out research on the use of waste of soft clay pottery products in the form of broken elements of sanitary equipment. Research conducted by [23; 34] showed that the concrete made entirely on aggregate made of sanitary ceramics does not deviate from physical and mechanical properties of concrete on natural aggregates. In the research carried out by [35], 15-25% of the aggregate was replaced with a crushed ceramic cullet. The achieved concretes showed similar features to the basis of gravel aggregate. It was also noticed that as the amount of ceramic material increases, the compressive strength of the concrete increases as well. In research [36], 25% of natural coarse aggregate was replaced with sanitary ceramic waste in order to make concrete that will be in direct contact with water available for human consumption.