Cement Net Exclusive: The Moon Builds Cities! Musk wants to achieve it in 10 years! How to solve the problem of cement?

local time, Musk posted on social platform X that "SpaceX has shifted its focus to building a self-expanding city on the moon, because we are expected to achieve this goal in 10 years, while it will take more than 20 years to go to Mars."

to solve the problem of building materials in the construction of the lunar city (especially the alternative of cement), The core idea is "in-situ resource utilization (ISRU)"-that is, to use the moon's native resources (such as lunar soil, lunar rock) to manufacture building materials, to avoid transportation from the earth (the cost is very high, about $50000-90000/kg). The following are the specific solutions and technical progress. Sort by availability priority:

that China's Yuehuzun Project (led by Huazhong University of Science and Technology) has The simulated lunar soil vacuum sintered brick was successfully prepared, with a compressive strength of more than 30 MPa (far exceeding 10-20 MPa of ordinary cement brick), and passed the space exposure experiment (sent to China Space Station by Tianzhou-8 in 2024 to verify its performance under cosmic radiation and temperature difference (-190 ℃ to 127 ℃)).

the European Space Agency (ESA) has printed 6m X 6m X 6m building components using lunar soil simulants." Its hardness is comparable to that of concrete; China plans to land a lunar spider robot on Chang'e-8 in 2028 to test the practical application of 3D printing of lunar soil.

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NASA experiments have shown that, The compressive strength of geopolymer can reach 20-40 MPa (equivalent to ordinary cement brick), and its temperature resistance is better (no deformation from -50 ℃ to 200 ℃).

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a team from Jilin University in China has brought back the moon from Chang'e-6." The discovery of natural carbon nanotubes (formed by micrometeorite impact + iron catalysis) in the soil (the far side of the moon) proves the feasibility of this path.

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