Аннотация
For the experimental studies, waste from the processing of marbleized limestone (MLPW) was used as the primary raw material. White Portland cement M500 was employed as the binder. Inorganic red, green, and blue pigments were used to produce colored products. The specimens were moulded under a compaction force of 300 kN. The products were cured for 7 days in a water-curing environment. After 7 days of water curing (tested at the total age of 9 days), the compressive strength of the specimens ranged from 48.3 to 53.8 MPa, corresponding to a high early-age strength level typically associated with brick grades M450–M500. The results of the experimental studies indicate that the incorporation of pigments at dosages of 3.5–6.5% enables the production of colored hyperpressed bricks without a substantial change in their average density; however, it has a noticeable effect on their strength characteristics. For all pigments investigated, the highest mean strength values were obtained at a pigment content of 5%, whereas a further increase in the dosage to 6.5% was accompanied by a reduction in the mean strength. The microstructure of the investigated specimens was characterised by a predominantly dense and heterogeneous structure consisting of a cement matrix, mineral particles of MLPW of various sizes, pores, and microcracks. Fine inclusions morphologically distinct from the surrounding phase were observed within the cement matrix and were presumed to correspond to the incorporated pigments. Energy-dispersive X-ray spectroscopy (EDS) was performed to determine their elemental composition and assess the distribution of the pigment components. The aim of this study was to develop compositions and a manufacturing technology for colored hyperpressed bricks based on waste from the processing of marbleized limestone.