【摘 要】
：
In this study,a new GVS(Ground Volcanic Scoria)lunar regolith simulant was pro-duced.The similarity between GVS and lunar soil was proved by comparison with Apollo lunar soil samples and other commercial lunar soil simulants.Then,GVS lunar regolith simula
【机 构】
：
School of Transportation Science and Engineering,Beihang University,Beijing 100083,China;Key Laborat
论文部分内容阅读
In this study,a new GVS(Ground Volcanic Scoria)lunar regolith simulant was pro-duced.The similarity between GVS and lunar soil was proved by comparison with Apollo lunar soil samples and other commercial lunar soil simulants.Then,GVS lunar regolith simulant was inves-tigated as the source material for preparing geopolymer to produce building material for lunar col-ony construction.To study the possibility of preparing geopolymer from GVS lunar regolith simulant and the optimum activator formulation as well as the optimum curing conditions,alkaline activated GVS slurries with different mixing ratios based on an orthogonal test scheme were pre-pared.The geopolymer products based on GVS were characterized by flexural strength test,com-pressive strength test,X-ray fluorescence(XRF),X-ray diffraction(XRD),Fourier Transform Infrared Spectroscopy(FTIR),Scanning Electron Microscope coupled with Energy Dispersive Spectroscopy(SEM-EDS),29Si magic angle spinning-nuclear magnetic resonance(29Si MAS-NMR),and 27A1 MAS-NMR.The experimental results indicate that changes in the mass ratio of sodium hydroxide and GVS and curing temperature have the most significant influence on the flex-ural strength and compressive strength,respectively.The GVS-based geopolymer can obtain the highest 28-day compressive strength and 28-day flexural strength up to 75.6 MPa and 6.3 MPa.Microstructural results imply that the changes of Si occurring in a variety of environments that explaining preliminarily about the reaction mechanism of GVS-based geopolymer.This study approves the feasibility of making a geopolymer derived from the GVS lunar regolith simulant and the potential utilization of geopolymer based on lunar regolith for construction of the lunar colony in future space exploration.
其他文献
Modular Solar-Powered Aircraft(M-SPA)is a kind of High-Altitude Long-Endurance(HALE)aircraft which exploits the mission advantage of swarm UAV and the HALE advantage of large aspect-ratio SPA.M-SPA\'s separated mode and combined mode give it the potenti
This paper tackles the robust leaderless Time-Varying Formation(TVF)control problem for the Unmanned Aerial Vehicle(UAV)swarm system with Lipschitz nonlinear dynamics,external disturbances and directed switching topologies.In comparison with the previous
For metal-intermetallic laminated composites,various types of defects often occur dur-ing the preparation process.This paper studied the evolution and formation mechanism of defects,such as pores,tunnel cracks,and delamination cracks in Ti-Al3Ti laminated
This paper aims to gain insight into the nonlinear modal characteristics and the possible influence of the modes on the responses for the practical dual-rotor system with rub-impact in aero-engine.The finite solid element method combined with a constraint
This paper develops a novel optimization method oriented to the resilience of multiple Unmanned Aerial Vehicle(multi-UAV)formations to achieve rapid and accurate reconfiguration under random attacks.First,a resilience metric is applied to reflect the effe
Layup temperature is a vital factor that affects the production quality of automated fiber placement for thermoset composites.For high quality production,this paper proposes a new pre-diction model of layup temperature by considering the structure of infr
This paper proposes a new distributed coordinated control scheme based on heteroge-neous roles for Unmanned Aerial Vehicle(UAV)swarm to achieve formation control.First,the framework of the distributed coordinated control scheme is designed on the basis of
In high speed milling aeronautical part,tool condition monitoring(TCM)is very impor-tant,because it is prone to get a chatter owing to the low stiffness of thin-walled structures.And the TCM is key technology for automated machining.In this paper,aiming t
This study aims at investigating the impact of using the Magnetorheological Elastomers(MREs)medium to improve the formability of T-shaped Inconel 718 tubes during the bulging pro-cess.Besides,the influence of the punch size and the intensity of the magnet
针对隧道施工监测内容,以三维激光扫描仪获取的点云数据为基础,研究隧道点云中轴线和连续断面的提取、隧道断面拟合、隧道超欠挖判别、监测报表生成等关键算法,以AutoCAD为平台、Excel为数据容器,运用VBA语言进行软件二次开发,形成包括点云数据转换、隧道断面分析和监测数据整理功能的隧道点云数据变形分析系统.使用结果表明系统稳定性良好,点云数据处理效率高.