Mechanical properties of copper slag waste based CLSM mixtures

The article presents the results of investigations of the compressive strength of controlled low-strength materials (CLSM) prepared with the use of copper slag waste as a filler. Eighteen mixtures were made of which part with sole copper slag waste, part with sand which served as reference and mixtures in which half of the filler was sand and half the copper slag waste. Part of them was prepared with 60 kg/m(3) of cement and another part with 40 kg/m(3) of cement. As a supplementary binder conventional fly ash was used. The aim was to recognie the feasibility of this type of material using copper slag waste as filler. Compressive strength tests were performed on the specimens in form of 40x40x160 mm bars. The tests showed that after meeting certain conditions regarding the composition of the mixture, the copper slag waste can be used as a filler in CLSM. The compressive strength values after 180 days not exceeded 1.60 MPa which is a very good result for this kind of material.