Effects of slag of blast furnace and sand of dune on durability of mortar and concrete

This study investigates the effect of slag of blast furnace (SL) and sand of dune, (SD) replacement of cement on the durability of cement to chemical aggressive water (acid and sulfates) attack, Tow replacement levels were considered in the study: (5% sand of dune + 15% slag) and (10% sand of dune + 15% slag) by weigh to cement. The other parameters durability investigated in the study were: volumetric stability (shrinkage of drying and swelling), the concrete water permeability. The chemical resistance of cement to the acid and sulfate attack was evaluated by compressive strength reduction of cement specimens were immersed in 5% chloride magnesium and in 5% sodium sulfate solution for a total period of 28 and 90 days. the results obtained show that substitution partial of cement by slag and sand of dune to offer to cement a better stability to the chemical aggressive, and swelling however we noted that the increase in the content of sand of dune of 10% generates a slight increase in shrinkage of drying compared to cement without additions, the water permeability which is an essential characteristic of durability of concrete to be improved specially with partial replacement cement at (5% sand of dune + 15% slag) by weight cement.