they're brick tiles
Don't you want an exterior grout then?
I've got a Kango you could borrow to apply it.
Yes. I meant that I don't think sand alone will hold.
Kango
I'm a bit confused. Like a jackhammer?
Sorry if I missed something.
I was being facetious, obliquely implying you dig it up & start again.
In all seriousness, though - I'd expect drainage to be a problem, and anything you grout it with is going to suffer & eventually just crumble.
@hugo7 started
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Don't you want an exterior grout then?
I've got a Kango you could borrow to apply it.