Alfresco - Raise height

Hi All,
In our house, the builder has left the Alfresco area as concrete. And we would like to get the area tiled. However, the drop from family room to alfresco is 200 mm.
Now before we lay tiles, we would like to raise the height of alfresco to reduce the drop to 100 mm.
We've contacted few tilers, and everyone gives different opinion.
Some suggests concrete on top of existing concrete area is strong, while other suggests sand-cement mix would be sufficient enough.

Can the experts please advise what would be a better solution.

Thanks

I'm no expert in concreting, but what you seem to be asking is whether to have a 100mm thick slab of concrete, or a 100mm thick slab of mortar...

Concrete is pretty much mortar but will the little aggregate stones in the mix, and that's what gives it more strength than mortar, plus it'll probably be cheaper too. I'd go with a concrete slab.

We poured concrete on top of our alfresco slab to raise it then we tiled. We still have a step down after this but just only 50mm from the main house slab.

ok, I was just reading online that concrete poured over an existing slab is more vulnerable to frost heave damage and cracks. So am bit concerned about this.

Hi melbournevic I was just wondering how your tiled alfresco is going? I am considering doing the same, raising concrete level to tile, but unsure of where to start? Can you tell me who you used to do the work?
Thanks