Floor Lamp base

ashgg1

Hi, I have a 180 cm tall floor lamp in my bedroom, whose concrete base got damaged, and the lamp can no longer stand on its own. I'm planning to use quick setting concrete to rebuild the base, something like this: https://www.youtube.com/watch?v=x43Qycb2s64

Any thoughts on which concrete product could be helpful here? I guess I'd need <5kg of concrete to build the base which is 25 cm in diameter.

Or if there are better ideas than using concrete, that'll be great to know. Thank you.