Some cement firms add 1-3% copper slag as an additive during the manufacture of their cement. They intend to obtain a simple cheap green resource of iron by recycling copper slag. Note that copper slag contains about 60-70% Fe2O3.
Are there negative effects for this use? Compared to OPC, how the following are affected:
1. Fresh properties (workability and setting time)
2. Mechanical properties: Strength and Modulus of elasticity.
3. Durability: Against sulfates and chloride ion penetration.
4. Cracking: Plastic and drying Shrinkage
Thank you
Of course there are few possible side effects.
1.Major component of Copper slag is SiO2, which is responsible for formation of di-calcium and tri-calcium silicates imparting strength to concrete but it will also lead to increase in setting time.
2. Although Fe2O3 constitutes hardly to 1% in copper slag, it has potential to effect color of cement.