Self-leveling concrete application - GIF

[Frank S]

We have this in our house (we have hydronic heating - long runs of PEX pipe in the floor with a concrete top). The concrete is batch mixed on site, sand and not gravel. It is pumped into the house. It is called self leveling concrete.

I found one picture that showed the pour:


You can see how runny it is. It dries very smooth, no bubbles, not a hot mix from what I understand, but I don't know much more about it.

Seeing your I am wondering if some epoxy polymers weren't added to the mix to harden the final surface help seal it and prevent it from chalking. or was it sealed after curing?