How can you build cities without cement?

Modern cities are built from concrete with steel rebar because it is abundantly available and provides enough tensile strength. Concrete requires cement. Cement is made from limestone. Limestone is made from coral and skeletal remains. On lifeless planets there are no organic materials such as limestone because there was never any life. There's basically just a lot of basalt and other igneous rocks.

If you were going to build a city on another planet, what kind of materials would you use to provide the kind of tensile strength that you need?

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Communities

How can you build cities without cement?

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