1. The initial setting time and the final setting time of cement pastes are not so much influenced by the use of marble dust.
2. Expansion measurements of cement paste show that the expansion value is not considerably affected by the use of marble dust, where this value ranges from 2.00mm to
2.75 mm.
3. TGA test results indicate that there is no change in phase
chemistry for cement paste modified with marble dust com- pared with control cement paste and the variation of cal- cium hydroxide content is insignificant.
4. SEM investigation shows that the morphology of the internal structure of paste specimens with and without marble dust are not considerably different from each other which verify that marble dust has no noticeable role during the hydration process.
5. The compressive strength of cement mortar increases by the use of marble dust as cement replacement
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% mar- ble 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 replace- ment 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.