Abstract
In this study, a series of manganese slag and fly ash-based geopolymers were prepared though alkali activation by varing the amount of manganese slag. The 3-day, 7-day and 14-day compressive strengths of these samples were tested. The maximum strength of 42.78 MPa was obtained at 14th days of testing when 455 g of fly ash, 195g of manganese slag, 20% of the alkali content , the curing temperature of 100°C, the curing time of 12h were used. XRD and FTIR characterization results shown that the polymerization reaction occurs between the glassiness in the manganese slag and the fly ash while adding alkali activator, and the main structure formed was Ca-A-S-H, which contributed the major strength in manganese slag and fly ash-based geopolymer.
Highlights
Fly ash is a slag obtained from the flue gas of coal-fired power plant
Compared with X- ray diffraction (XRD) of fly ash(Figure 1), the diffuse hump decreased and shifted to the right, illustrating that amorphous aluminosilicate minerals reacted with activator(25-40°)
Part of quartz and mullite crystal phase convert to amorphous structure with the reaction processing, and Ca-A-S-H gel was formed in the alkaline environment
Summary
Fly ash is a slag obtained from the flue gas of coal-fired power plant. Electrolytic manganese slag is a by-product of the industrial production of manganese dioxide. China's annual output of electrolytic manganese metal accounted for 98% of the global [1]. Duan et al determined that the main pollutants in the residue were manganese sulfate, ammonia nitrogen and heavy metals, such as cadmium and nickel. They found that 13.7% Mn, 17% Se, 44.09% ammonia and 55.3% SO42- from raw materials entered residues [5]. One of the important way of recycling of manganese slag and fly ash is to use them to prepare the geopolymer material. We prepared manganese slag and fly ash-based geopolymer using manganese slag and fly ash as raw material, sodium silicate and sodium hydroxide as activator. X- ray diffraction (XRD) and Fourier transform infrared spectroscopy (FIIR) were used to characterize the product of the geopolymer materials
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