模拟月壤地聚合物制备及其性能分析

Preparation and Performance Analysis of Simulated Lunar Soil Geopolymers

为探究碱激发剂对模拟月壤地聚合物性能的影响,对含有不同碱激发剂掺量的模拟月壤地聚合物进行抗压强度、流变剪切应力、反应放热、差示扫描量热-热重(DSC-TG)和X射线衍射(XRD)分析。结果表明,在80℃养护条件下,适量NaOH能够显著提高模拟月壤地聚合物的抗压强度,其中掺入6%NaOH使地聚合物7 d、28 d抗压强度分别达到12.5 MPa和14.6 MPa。复掺NaOH与Na_(2)SiO_(3)可提高浆体黏度和剪切应力,当掺入4%NaOH和6%Na_(2)SiO_(3)时,剪切应力达到36.8 Pa。NaOH和Na_(2)SiO_(3)单独掺入或复合掺入均能与模拟月壤反应生成水化硅铝酸钙(C-A-S-H)凝胶和水化硅铝酸钠(N-A-S-H)凝胶。碱激发剂种类对模拟地聚合物的放热速率和放热量有显著影响,掺入Na_(2)SiO_(3)有助于提高模拟月壤的放热速率,同时随着时间的延长,放热速率在0~1 h范围内先增大后快速减小。相较NaOH,Na_(2)SiO_(3)更有利于提高模拟月壤地聚合物的热稳定性。

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 Na_(2)SiO_(3) could improve the viscosity and shear stress of the paste.When 4%NaOH and 6%Na_(2)SiO_(3) were added,the shear stress reached 36.8 Pa.NaOH and Na_(2)SiO_(3) 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.Na_(2)SiO_(3) 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,Na_(2)SiO_(3) was more conducive to the improvement of the thermal stability of the simulated lunar soil geopolymers.