Cracked patio tiles - grout to fix?

[Rollerball]

I have half a dozen 'patio' tiles on a short 'ramp' outside my door, some of these are cracking due to wear and tear and frost damage.

I don't really want to have to replace them, however the cracks are big enough to allow me to put some filler material in them. Is some kind of outdoor grouting material the best option (if so, which type?) or should I just use cement in the cracks?

If anything this is just a way to increase their longevity before the time comes when at least some will need replacing. I should note that they don't appear to be loose, even the more badly cracked ones.

 

[foxhole]

Sand and cement ? Maybe put a mortar rake thru the cracks to open them enough.

 

[Rollerball]

Thanks, I'll try that.