Wastewater treatment generates major amount of sludge and its disposal presents significant ecological and economical problem. Carbide sludge is a byproduct of acetylene production and is treated as a technological wastewater. Sludge is in its content calcium hydroxide, with a slight percentage of impurities, which is one of the main contents of the cement stone. This study analyses possibility of using carbide sludge in the production of self-compacting concrete. Self-compacting concrete is the new type of concrete which flows under its own weight and does not require any external vibration for compaction. Even though its use has many advantages, there is a lack of research and standards for mix design and testing methods. Properties of fresh self-compacting concrete containing carbide sludge or carbide powder (dehydrated sludge), as well as the water permeability, gas permeability and the compression strength of the hardened samples are tested . The results have determined that the addition of the carbide sludge causes greater compression strength, and reduced gas permeability. It is not possible to replace more than 20% of cement with carbide sludge due to reduction of the viscosity and flowability. Samples in which the carbide powder has been used show reduction in the compression strength, but retain the self-compacting ability and are suitable for mass concrete and slightly reinforced concrete constructions.