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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

邮发代号 80-968

2019 Impact Factor: 1.68

Frontiers of Structural and Civil Engineering  2023, Vol. 17 Issue (10): 1535-1553   https://doi.org/10.1007/s11709-023-0003-0
  本期目录
Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure
Feng LI1, Rongrong ZHANG1, Siqi ZHOU1(), Xingyi ZHU2
1. School of Transportation Science and Engineering, Beihang University, Beijing 100083, China
2. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
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Abstract

Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure construction. This study aims to improve the printability of a geopolymer based on a BH-1 lunar regolith simulant, including the extrudability, open time, and buildability, by controlling the temperature and adding admixtures. Rheological parameters were used to represent printability with different water-to-binder ratios, printing temperatures, and contents of additives. The mechanical properties of the hardening geopolymer with different filling paths and loading directions were tested. The results show that heating the printed filaments with a water-to-binder ratio of 0.32 at 80 °C can adjust the printability without adding any additive, which can reduce the construction cost of lunar infrastructure. The printability of the BH-1 geopolymer can also be improved by adding 0.3% Attagel-50 and 0.5% polypropylene fiber by mass at a temperature of 20 °C to cope with the changeable environmental conditions on the Moon. After curing under a simulated lunar environment, the 72-h flexural and compressive strengths of the geopolymer specimens reach 4.1 and 48.1 MPa, respectively, which are promising considering that the acceleration of gravity on the Moon is 1/6 of that on the Earth.

Key wordsgeopolymer    lunar regolith simulant    3D printing    rheology    printability
收稿日期: 2022-11-10      出版日期: 2024-01-15
Corresponding Author(s): Siqi ZHOU   
 引用本文:   
. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(10): 1535-1553.
Feng LI, Rongrong ZHANG, Siqi ZHOU, Xingyi ZHU. Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure. Front. Struct. Civ. Eng., 2023, 17(10): 1535-1553.
 链接本文:  
https://academic.hep.com.cn/fsce/CN/10.1007/s11709-023-0003-0
https://academic.hep.com.cn/fsce/CN/Y2023/V17/I10/1535
elementcontent
real lunar regolith collected by Apollo 14JSC-1 lunar regolith simulantCAS-1 lunar regolith simulantBH-1 lunar regolith simulant
SiO248.1047.7049.2043.30
TiO2 1.70 1.60 1.90 2.90
Al2O317.4015.0015.8016.50
FeO10.4010.8011.5016.70
MnO 0.14 0.18 0.14 0.30
MgO 9.40 9.00 8.70 3.00
CaO10.7010.40 7.50 8.80
Na2O 0.70 2.70 3.10 3.80
K2O 0.55 0.82 1.03 3.30
P2O5 0.51 0.66 0.30 0.70
Tab.1  
Fig.1  
parametervalue
length (mm)3
diameter (μm)32
density (kg·m?3)910
tensile strength (MPa)≥ 460
Young’s modulus (MPa)≥ 3500
ignition point (°C)580
Tab.2  
Fig.2  
Fig.3  
serieswater-to-binder ratiomass ratio of PP fiber to BH-1mass ratio of Attagel-50 to BH-1
W300.3000
W320.3200
PP3_1.0%0.321.0%0
PP3_1.5%0.321.5%0
PP3_2.0%0.322.0%0
ATT0.3%0.3200.3%
ATT0.5%0.3200.5%
ATT1.0%0.3201.0%
Tab.3  
test groupBH-1 (g)NaOH (g)water (g)printing temperature (°C)
W30T4010009030040
W30T6010009030060
W30T8010009030080
W32T4010009032040
W32T6010009032060
W32T8010009032080
Tab.4  
Fig.4  
Fig.5  
rheological parameterW30W32
static yield stress (Pa)3803.72039.8
dynamic yield stress (Pa)3040.981471.53
plastic viscosity (Pa·s)24.1514.08
Tab.5  
Fig.6  
Fig.7  
Fig.8  
rheological parameterATT0.3%numerical comparisonW30
static yield stress (Pa)3789.143803.70
dynamic yield stress (Pa)2233.57<3040.98
plastic viscosity (Pa·s)12.65<24.15
Tab.6  
Fig.9  
Fig.10  
Fig.11  
Fig.12  
Fig.13  
Fig.14  
Fig.15  
Fig.16  
Fig.17  
seriesBH-1 (g)NaOH (g)water (g)Attagel-50 (g)PP fiber (g)printing temperature (°C)
W321000903200020
ADM1000903203520
Tab.7  
Fig.18  
Fig.19  
Fig.20  
Fig.21  
Fig.22  
Fig.23  
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