[defrost]

"Yes"

From a glass making point of view you don't want them messing with expansion coefficients and bulk properties so they're off the table there - it's a waste of energy to reheat them up to ~ 1,000 C.

But you do end up with large volumes of glass .. a relatively consistant material, you might want to crush and tumble that (to take the sharp edges away) and use that sized grit | frit as driveway material, as additive to concrete where structurally sound, as fish tank "sand", etc.

[toxik]

IIRC concrete aggregate should be jagged so that it interlocks with itself. You actually can't just use any old sand, you need sharp sand, which is an increasingly scarce resource.

[defrost]

My bad .. mentally insert more commas and juggle the clauses :-)

The tumbling was only meant to be applied to application requiring rounded grit, you're correct that concrete and other uses might prefer jagged.

[inglor_cz]

"you need sharp sand"

Hmm, practical concerns about acquisition aside, would lunar dust work?

[jasomill]

Yes:

https://en.wikipedia.org/wiki/Lunarcrete