Re: Need Info On Cement Properties
Hard to say exactly what the problems are ... based on your descriptions I would have to suspect the installation and finishing techniques that were done.
It may be there was water added to the mix at the time of pour or at the time of finishing ..... perhaps water sprayed on top or troweling in bleed water during final finish dilutes the amount of cement available in the top most layer where it's needed the most.
The first 7 days are important for proper cure of the concrete and if done improperly can cause future problems.
Depends .... sight unseen.
"" an ounce of perception -- a pound of obscure "