Preparation and Performance Study of Multi-Solid Waste Geopolymers
In order to realize the recycling of tailing solid waste materials and improve the utilization rate of industrial solid waste,a multi-solid waste geopolymer was synthesized using bauxite tailings,glanulated blast furnace slag,and ceramic powder as raw materials,and NaOH-Na2SiO3 composite solution as an alkali activator.The effect of the composite activator on the compressive strength of the geopolymer at different alkali-equivalent was studied,and the influencing mechanism was explored through XRD,FTIR,and SEM.The results showed that with the increase of the alkali-equivalent of the composite activator,the compressive strength of the geopolymer at each age increased first and then decreased.When the alkali-equivalent of the composite activator was 5%,the compressive strength of the product at 28 d reached the optimal value of 63.3 MPa.Increasing the alkali-equivalent appropriately was beneficial for compressive strength,but excessive alkali-equivalent could lead to a decrease in compressive strength.Microscopic analysis showed that geopolymers synthesized with different alkali-equivalent had a certain degree of polymerization reaction and generated amorphous hydration products mainly composed of C-A-S-H.The degree of polymerization reaction increased with the increase of alkali-equivalent,and the microstructure showed that the matrix was more uniform and dense.
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