Heavyweight concrete containing steel slag
A heavyweight concrete composition comprising cement, steel slag coarse particles, steel slag fine particles, and iron ore aggregate, a wet concrete slurry of water mixed with the heavyweight concrete composition, and a heavyweight concrete which is a cured form of the wet concrete slurry. In the present disclosure, sand, which is used in conventional concretes, is replaced with steel slag fine particles to produce a sand-free heavyweight concrete.
1. A heavyweight concrete composition, comprising:
8-15 wt % cement;
65-83 wt % steel slag; and
3-10 wt % of an iron ore coarse aggregate, each relative to a total weight of the heavyweight concrete composition;
wherein:
the steel slag is present as a mixture of steel slag coarse particles having a particle size of 2-10 mm and steel slag fine particles having a particle size of 0.1-1.5 mm; and
the iron ore coarse aggregate has a particle size of 3-7 mm.
2. The heavyweight concrete composition of claim 1 , wherein a weight ratio of the steel slag coarse particles to the steel slag fine particles ranges from 1.5:1-3:1.
3. The heavyweight concrete composition of claim 1 , wherein a weight ratio of the steel slag coarse particles to the iron ore coarse aggregate ranges from 4:1 to 20:1.
4. The heavyweight concrete composition of claim 1 , wherein a weight ratio of the steel slag fine particles to the iron ore coarse aggregates ranges from 2:1 to 10:1.
5. The heavyweight concrete composition of claim 1 , which comprises:
45-55 wt % of the steel slag coarse particles; and
20-28 wt % of the steel slag fine particles, each relative to a total weight of the heavyweight concrete composition.
6. The heavyweight concrete composition of claim 5 , consisting essentially of the cement, the steel slag coarse particles, the steel slag fine particles, and the iron ore coarse aggregate.
7. The heavyweight concrete composition of claim 1 , wherein 4-6 wt % of the iron ore coarse aggregate is present, relative to a total weight of the heavyweight concrete composition.
8. The heavyweight concrete composition of claim 1 , wherein the cement is an ordinary Portland type I cement.
9. The heavyweight concrete composition of claim 1 , wherein the steel slag comprises:
20-45 wt % of iron oxide;
3-10 wt % of aluminum oxide;
15-30 wt % of calcium oxide; and
3-18 wt % of silicon dioxide, each relative to a total weight of the steel slag.
10. The heavyweight concrete composition of claim 1 , wherein the steel slag has a specific gravity of 3-4.
11. The heavyweight concrete composition of claim 1 , wherein the steel slag has a water absorption of 0.5-5%.
12. The heavyweight concrete composition of claim 1 , which is devoid of sand.
13. A wet concrete slurry, comprising:
the heavyweight concrete composition of claim 1 ; and
3-10 wt % of water relative to a total weight of the wet concrete slurry.
14. A heavyweight concrete, comprising a cured form of the wet concrete slurry of claim 13 .
15. The heavyweight concrete of claim 14 , which has a compressive strength of 60-80 MPa according to ASTM C39.
16. The heavyweight concrete of claim 14 , which has a unit weight of 3,100-3,400 kg/m 3 according to ASTM C138.
17. The heavyweight concrete of claim 14 , which has a unit weight 3-20% greater than a substantially identical concrete not formed with the iron ore coarse aggregate.
18. A method of making the heavyweight concrete of claim 14 , the method comprising:
casting the wet concrete slurry in a mold to form a casted wet concrete; and
curing the casted wet concrete thereby forming the heavyweight concrete.
19. The method of claim 18 , wherein casting is performed at a temperature of 15-35° C.