Performance of Lithium Slag Geopolymer with Different Activation Process
To reveal the feasibility of preparing alkali activated geogeopolymer using different activation methods of lithium slag,the hydration performances of non activated,microwave activated,and thermally activated lithium slag based geopolymer were compared and analyzed.The results show that thermal activation and microwave activation can significantly improve the activity of lithium slag,enhance the hydration heat and heat release of lithium slag based geopolymer,and the activity of thermal activated lithium slag is higher than that of microwave activated lithium slag.When 2%NaOH and 4%Na2SiO3 are added,the hydration heat and heat release of the geopolymer are the best.When the content of Na2SiO3 is the same,excessive NaOH addition will slow down the hydration heat release rate and reduce the accumulated heat.Thermal activation and microwave activation can significantly improve the compressive strength of lithium slag based geopolymer.When 2%NaOH and 4%Na2SiO3 are added,the 3 d compressive strength of the microwave activated lithium slag based polymer is the highest,increasing by 9.3%compared to the non-activated lithium slag based polymer.The compressive strength of thermally activated lithium slag based geopolymer is the highest at 28 d,which is 18.69%higher than that of non-activated lithium slag based geopolymer.When 4%NaOH and 4%Na2SiO3 are added,the 3 d compressive strength of thermally activated lithium slag based geopolymer is the highest,increasing by 23.75%compared to the non-activated lithium slag based geopolymer.The compressive strength of microwave activated lithium slag based polymer is the highest at 28 d,which is 9.73%higher than that of non-activated lithium slag based polymer.The thermal activation and microwave activation activities are enhanced.Ettringite and(N)C-A-S-H gel,produced through the alkaline activation reaction of lithium slag geopolymer,contain a greater amount than the initial lithium slag geopolymer.With the same Na2SiO3 content,the activity of lithium slag based geopolymer decreases with the increase of NaOH content.
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