6. A reduction in the compressive strength of marble
dust modified mortar of 5.0% lower than control
specimen is reported at 15.0% marble dust as cement
replacement.
7. The compressive strength of concrete made with 15.0% marble
dust as cement has been found to be either comparable
or less than control mix.
8. The concrete compressive strength increases with the
increase of marble dust ratio as sand replacement up to
15.0% of sand by weight. Also, The use of marble dust as sand
replacement is more effective with lower w/c ratio.
9. A significant improvement in concrete tensile strength is
recorded due to the use of marble dust as cement replacement
as well as sand replacement.
10. The use of marble dust up to 15.0% as cement replacement
or as sand replacement positively affects the steel-concrete
bond strength.