Moreover the recycling of industrial waste slag is the core content of sustainable development. So it is unusual to use steel slag aggregate in concrete. The major chemical components of the cement and steel slag are shown in … challenging. Slag cement can contribute to achieving LEED points to help your project attain this globally-recognized sustainability certification. Utilizing steel slag in concrete mixes has proved to be useful in solving some of the problems encountered in the concrete industry. The chemical composition of steel slag is similar to that of cement. In this paper, an overview of the recent achievements and challenges of using steel slags (BOF, EAF and LF slag) as cement replacement (usually ground into powder form with the size of 400–500 m 2 /kg) and aggregate in cement concrete is presented. At present, the commonly used cement has low tensile strength and low flexural strength, which is a fatal defect of cement materials. In addition, the steel industry steel mill produces a large amount of waste steel slag. Figure 1 shows the particle size distributions of the cement and steel slag powder. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties. It is is produced by the steel production industry. The steel slag used was the converter steel slag with 1.5% f-CaO (by mass). Much of this work shows that properly aged steel slag can be nonexpansive when used … Steel slag was used in conventional concrete to improve its mechanical, physical, and chemical properties. Slag cement, a byproduct of steel-making, enhances the traditional concrete benefits of strength and durability while offering reductions in waste, energy use and greenhouse gas emissions. Despite some limited field applications, virtually all research has been done in the laboratory. Research on the use of steel slag aggregate in PCC has been carried out in Spain, Germany, Canada, Italy, India, and Saudi Arabia. Compared with the blast furnace slag, steel slag has the expansibility due to the reaction with water and free CaO. The use of blast furnace slag aggregates in concrete by replacing natural aggregates is a most promising concept because its impact strength is more than the natural aggregate. MELBOURNE, AUSTRALIA, APRIL 9, 2020 --Researchers have shown how a by-product of steel making can be used to both treat wastewater and make stronger concrete, in a zero-waste approach to help advance the circular economy.Produced during the separation of molten steel from impurities, steel slag is often used as a substitute aggregate material for making concrete. Steel slag can also be used to absorb contaminants like phosphate, magnesium, iron, calcium, silica and aluminum in the wastewater treatment process, but loses its effectiveness over time. Steel slag aggregates are already being used as aggregates in asphalt paving road mixes due to their mechanical strength, stiffness, porosity, wear resistance Slag happens when iron ore is melted. Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. The molten iron sinks to the bottom, while the slag will float on the top of the iron. The X-ray diffraction (XRD) patterns of the steel slag are shown in Figure 2. Therefore it is specified in Standard Specification for Concrete in Korea that steel slag aggregate must not be used in concrete. Steel slag is currently utilized both to treat wastewater, and as a concrete aggregate. It is extremely urgent to conduct research on this shortcoming of cement. 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