Preparation and Properties of Foundry Dust Based Geopolymer
Geopolymer was prepared by the compression molding method using foundry dust and water glass as raw materials.The effects of foundry dust ratio,water-to-ash ratio,water glass concentration and modulus,and molding pressure on the compressive strength of foundry dust based geopolymer are studied through single-factor experiments and orthogonal experiments.Scanning electron microscopy and energy spectrum analysis are conducted to characterize the microscopic morphology and composition of the geopolymer.The study shows that the compressive strength of foundry dust based geopolymer increases with the increase of molding pressure,and initially increases and then decreases with the increase of water-to-ash ratio,water glass concentration,and modulus.The magnitude of the influence of each factor is as follows:water glass modulus＞molding pressure＞water-to-ash ratio＞water glass concentration.The optimal parameters are water-to-ash ratio of 17％,water glass concentration of 38％,modulus of 1.3,molding pressure of 60 MPa,and compressive strength of 19.46 MPa after 28 days.The low modulus of water glass promoted the formation of gel phase,and the high molding pressure made the internal structure of the sample more compact,thus improving the compressive strength of the foundry dust based geopolymer.
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