Slag cement concrete sometimes turns green for a short period of time due to the oxidation state of sulfide sulphur compounds during portland/slag cement hydration. The molten slag at a temperature of about 1500°C Slag cement, often called ground granulated blast-furnace slag (GGBFS), is one of the most consistent cementitious materials used in concrete. It has been found that using a slag mix for cementing is beneficial economically and technically as well as better for the environment than Portland cement. The fineness of discharge can be controlled to 2-10mm with a handling capacity of 40 tons per hour. SCA normally suggests that concrete that displays greening be left alone, and the greening will disappear. Slag cement is most widely used in concrete, either as a separate cementitious component or as part of a blended cement. Using granulated blast furnace slag can save energy by 20-40%, reduce costs by 10-30%, and reduce CO2 emissions by 44%. Reducing energy consumption, since a ton of slag cement requires nearly 90% less energy to produce than a ton of portland cement. Most general or structural concrete applications (flatwork, paving, foundations, walls, columns, floors, etc. ) The length of the first bin can be shortened to 2.6m and the second increased to 3.9m to enhance the grinding capacity of the ball mill. In such cements GGBS content ranges typically from 30 to 70%. It is estimated that for every ton of pig iron produced, the amount of slag produced is about 300 kg. GGBFS is divided into three classifications based on its activity index. Few reports have studied slag binders with high slag proportions (>90%) and low-cost activators (solid waste is used) that have higher performance than cement for backfilling. Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. Concretes made with slag cement will generally exhibit higher flexural strength for a given level of compressive strength. Make this into a paste, apply and leave for a few minutes, wash off thoroughly, and let it take effect. By using granulated blast furnace slag, it improves harvest quantities and flavor by improving photosynthesis, reducing blight on lower leaves, preventing rice blast and promoting ripening. Portland Blast-furnace Slag Cement. When slag cement is mixed with water, however, the initial hydration is much slower than portland cement mixed with water; therefore, portland cement or salts of alkali metals, principally sodium and potassium or lime, are used to increase the reaction rate of slag cement (ACI 233R). The following video shows the production of BFS slag and emphasizes the important role it plays in the construction of our world:, Phone: 0086-0371-63313738 / 0086-18039114854. Slag cement concrete may experience some initial "greening" after placement but this temporary color change will disappear with exposure to light and air (see related FAQ on greening and SCIC #10, "Greening"). It is used as a mud cake modifier for the cementing of oil and gas wells.. Thus with the higher compressive strengths achievable with slag cement, structural stiffness can be enhanced, and load deflections minimized. Another effective solution is calcium hypochlorite (usually used for pool shock). Greening is not harmful, and is almost always temporary. Under natural conditions, the liquid slag is slowly cooled by the surrounding air. Have any question? It also dramatically lowers the rate of chloride ion diffusion and carbonation, thus significantly enhancing the corrosion protection offered by the concrete to the reinforcing steel. Bentonite Uses, Status and Processing in India, Gypsum: A Mineral Resource with a Variety of Uses. Ground-granulated blast-furnace slag (GGBFS) is a by-product of iron and steel-making obtained by quenching molten iron slag from a blast furnace in water or steam. SLAG Ground granulated blast-furnace slag (Fig. With the use of the ball mill, the granular slag can be processed into ultrafine slag powder. Once fully solidified, it will not liquefy during an earthquake, so no additional liquefaction measures are necessary. Slag cement generally improves workability, finishability and pumpability of plastic concrete. When the iron is processed using a blast furnace, slag and iron both collect at the bottom of the furnace. For information on proportioning and a table of suggested percentages for various applications and end results, see SCIC #2, Concrete Proportioning. Ground granulated blast furnace slag (GGBFS) is designated in ASTM C 989 and consists mainly of silicates and aluminosilicates of calcium. 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