Concrete slabs not adhered to mortar

[Elmariachi]

Hi.

Not sure if this is a common issue but I've just built a small step for my new patio, stepped onto it 24 hrs later and one of the slabs wobbled. Check the others and none have stuck to the mortar, though the mortar itself has set rock-hard.

Any pointers as to what might've gone wrong? I used a mix of 5-1 building sand and cement.

Do I have to take all the old mortar up and start again (it's on top of a single course of bricks) or is there some magic gloop I can chuck down to adhere the slabs?

Thanks,

James

[Elmariachi]

Well, thanks for the lack of replies. For the benefit of anyone else who might find this via a search in the future, I've decided to use Gripfill Ultimate after contacting Evo-Stik - weatherproof and bonds to concrete.

[lutonlagerlout]

James
most of us on here are working men,and this is our busy time
ideally slabs should be bedded on to a 6:1 grit sand cement mix
for steps and coping si is a good idea to use a bond bridge
this is an SBR slurry
if only there was a website with this information
:;):
wobbly steps
LLL