Manufacturing of cement based building materials incorporating alternative filler, obtained as a waste from industrial process, nowadays becomes more and more actual. It could be related not only to the cheaper expenses of the production if to compare with adequate products made of conventional raw materials, but also to the efforts to improve the quality of environmental. Investigations were carried out to explore the suitability of dolomite waste as fillers in expanded clay lightweight concrete by partly substituting of conventional quartz sand. The goal of the study is to examine expanded clay lightweight concrete mechanical and physical properties by mak-ing a comparison between traditional expanded clay lightweight concrete and units which containing different amount of dolomite waste. Physical properties such as density, porosity and absorption were determined. Tests were also performed to determine mechanical properties. Frost resistance and durability were tested