Slag replaces cement in new concrete production process
Slag, also known as granulated blast furnace slag, is the glassy material generated in the process of slag quenching in blast furnace iron-making melting, mainly composed of calcium oxide, silicon oxide and alumina, and it has a higher potential activity, in the effect of sharpening agent, it can generate a hydraulically settable cementitious materials compounding with water.
Slag powder can be mixed with concrete instead of the same amount of cement to improve the work of the fresh concrete; according to the different requirements of the concrete, slag powder can replace 30-70% of cement with the same amount so that per cubic meter of concrete can reduce production costs 15 – 30 yuan, external admixtures can not achieve this benefit. In addition, because the water demand of slag powder is smaller than cement, mixing with slag powder can reduce the water-cement ratio of concrete and water, reduce concrete bleeding, increase mobility, and improve workability and pumpability, therefore keeping a good working.
As it can equally replace 30-70% of the cement in cement plant, reduce the exothermic hydration of cement hydration, the total calories will be reduced, thereby reducing the temperature rise of the concrete, to avoid concrete cracking caused by the excessive temperature rise of the concrete.
In the case of do not change the water-cement ratio, with 30-70% amount of slag powder to replace cement will cause the early strength of concrete to be reduced. Due to the dater demand of slag powder is smaller than the cement, the actual cement ratio can be reduced, in the case to achieve the same slump, the early strength of concrete is not actually decreased. In the actual component, due to the role of the internal temperature rise, the cement strength can be declined.
Having incorporated slag powder, the temperature rise in the concrete benefits to strength development; the higher the temperature, the faster the strength develop, so the early strength of the actual members can be improved, the late strength growth is faster than pure cement concrete.
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