References
- Ko, S. W., Jang, B. C., Koo, J. K. and Lee, T. S. (2009). "Study for korea lunar simulant prototype development." Proceeding of the KSCE Korea Society of Civil Engineers, 10, 3598-3601 (in Korean).
- Lee, J. H., Ann, K. Y., Lee, T. S. and Mitikie, B. B. (2018). "Bottom-up heating method for producing polyethylene lunar concrete in lunar environment." Advances in Space Research, Vol. 62, No. 1, pp. 164-173. https://doi.org/10.1016/j.asr.2018.03.039
- Lee, J. Y. and Lee, T. S. (2019). "Optimization of material extruding performance to build a 3D printed habitat on the Moon and Mars." Journal of The Korean Society of Civil Engineers, KSCE, 39(2), 345-349 (in Korean). https://doi.org/10.12652/KSCE.2019.39.2.0345
- NASA and Bradley (2016). 3D-printed habitat challenge phase 2, Structural member competition rules V.5, NASA & Bradley University, Available at: https://www.bradley.edu/sites/challenge-phase2/documents/Competition_Rules.pdf (Accessed: January 28, 2020).
- NASA and Bradley (2018). 3D-printed habitat challenge phase 3, On-Site Habitat Competition Rules V.3, NASA & Bradley University, Available at : https://www.bradley.edu/sites/challenge/assets/documents/3DPH_Phase_3_Rules-v3.pdf (Accessed: April 20, 2020)
- Porter, M. (2017). Six teams earn honors, prize money in second construction level of NASA challenge to 3-D print a habitat, NASA, Marshall Space Flight Center, Available at: https://www.nasa.gov/directorates/spacetech/centennial_challenges/3DPHab/6-teams-earn-prize-money-in-second-level-of-challenge (Accessed: November 20, 2019).
- Porter, M. (2019). Teams 3D print planetary habitats, Awarded $700K in NASA Challenge, Marshall Space Flight Center, Available at: https://www.nasa.gov/directorates/spacetech/centennial_challenges/3DPHab/19-017.html (Accessed: January 12, 2020).
- Prater, T., Roman, M., Kim, T. and Mueller, R. (2017). NASA centennial challenge: 3D-printed habitat, NASA.
- Rogers, T. (2015). Everything you need to know about polyethylene (PE), Creative Mechanisms, Available at: https://www.creativemechanisms.com/blog/polyethylene-pe-for-prototypes-3d-printing-and-cnc (Accessed: January 12, 2020).
- SpecialChem (2019). Shrinkage values (%) of various plastics, Omnexus, Available at: https://omnexus.specialchem.com/polymer-properties/properties/shrinkage#PE-PL (Accessed: January 12, 2020).
- Standard, A. S. T. M. (2008). ASTM C109-standard test method for compressive strength of hydraulic cement mortars, ASTM International, West Conshohocken, PA.
- The Constructor (2019). Compressive strength of concrete - Cube test, procedure, results, Available at: https://theconstructor.org/concrete/compressive-strength-concrete-cube-test/1561/ (Accessed: November 20, 2019).