Effect of the presence of clay and limestone dust particles on the physico-mechanical characteristics of concrete

The effects of clay and limestone dusts in the aggregates on the physico -mechanical characteristics of concretewere investigated. The fine aggregates (dune sand) and coarse aggregates (crushed gravels) used in this study were washed, dried and sieved.Twodifferent mineralogical compositions of dusts (clay and stone) were incorporated in different rates(0%, 5%, 10%, 15%, 20%, 25% and 30%) by replacementin weight of fine(dune sand) and coarse (crushed gravel) aggregates. The presence of clay and limestone dust particles in the fine and coarse aggregates inexcessive quantities influencedthe physico –mechanicalpropertiesof fresh and hardened concrete. The results obtained showed that the effect of clay dust content is more important compared to limestone dust content on the properties of concrete.