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  • 1
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    Sulfur "Concrete" for Lunar Applications - Sublimation Concerns (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Melting sulfur and mixing it with an aggregate to form "concrete" is commercially well established and constitutes a material that is particularly well-suited for use in corrosive environments. Discovery of the mineral troilite (FeS) on the moon poses the question of extracting the sulfur for use as a lunar construction material. This would be an attractive alternative to conventional concrete as it does not require water. However, the viability of sulfur concrete in a lunar environment, which is characterized by lack of an atmosphere and extreme temperatures, is not well understood. Here it is assumed that the lunar ore can be mined, refined, and the raw sulfur melded with appropriate lunar regolith to form, for example, bricks. This study evaluates pure sulfur and two sets of small sulfur concrete samples that have been prepared using JSC-1 lunar stimulant and SiO2 powder as aggregate additions. Each set was subjected to extended periods in a vacuum environment to evaluate sublimation issues. Results from these experiments are presented and discussed within the context of the lunar environment.
    Keywords: Lunar and Planetary Science and Exploration
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Back to the Future: A Historical Perspective of Lunar and Martian In-situ Fabrication and Repair (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Scientists, engineers, and the general public have always speculated and dreamed about living and working on other planets. The allure and challenges of this endeavor have generated innumerable Conferences, feasibility studies and six manned Moon landings. As NASA prepares to return to the Moon and eventually Mars, it is only natural to stand on the shoulders of those giants who have gone before us. This time, as we go to stay, the development of processes that maximize the use of in-situ resources will become even more important. On demand fabrication of piece-parts to reduce required spares, development of habitat structures, and the ability to make repairs will all benefit from the use of in-situ materials including raw regolith and metals and/or gases extracted from regolith or planetary atmospheres. To support these activities, there will also be a need for recycling as well as non-destructive evaluation technologies. This paper will present a historical overview of technology development associated with In-Situ Fabrication and Repair (ISFR) elements described above and discuss the ISFR program implemented at NASA/Marshall Space Flight Center.
    Keywords: Lunar and Planetary Science and Exploration
    Type: AIAA Conference; Jan 30, 2005 - Feb 02, 2005; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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