Preparation and Performance Analysis of Simulated Lunar Soil Geopolymers
In order to explore the effect of alkali activators on the properties of simulated lunar soil polymers,compressive strength,rheological shear stress,exothermic reaction,DSC-TG,and XRD were carried out on simulated lunar soil polymers with different dosages of alkali activators.The results showed that the compressive strength of the simulated lunar soil geopolymer could be significantly improved by an appropriate dosage of NaOH under the condition of 80℃curing.The addition of 6%NaOH resulted in the compressive strength of the geopolymer reaching 12.5 MPa and 14.6 MPa at 7 d and 28 d,respectively.The addition of NaOH and Na2SiO3 could improve the viscosity and shear stress of the paste.When 4%NaOH and 6%Na2SiO3 were added,the shear stress reached 36.8 Pa.NaOH and Na2SiO3 individually or in combined incorporation could react with simulated lunar soil to form C-A-S-H gel and N-A-S-H gel.The alkali activator type had a significant effect on the exothermic rate and exothermic amount of the simulated geopolymer.Na2SiO3 could increase the exothermic rate of the simulated lunar soil.With the prolongation of time,the exothermic rate increased and then decreased rapidly in the time range 0-1 h.Compared to NaOH,Na2SiO3 was more conducive to the improvement of the thermal sta-bility of the simulated lunar soil geopolymers.
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