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Yes put more weight on your already sinking pad, it the most logical thing to do

For slabs on grade four days, for structural slabs,(those are slabs poured over floor voidform) one week, for suspended slabs , three weeks, concrete is usually cured fully in 28 days, after u pour...

Just use some floor grout and apply it like a drywaller would on the wall. Feather it out as best as possible I believe this will do for u

I personally would not pour over existing concrete the reason being is if the slab is sloped towards the house like you say, something made that happen and usually what it is is water getting...

You got the right thing going there. To keep the fibre board fastened just use a small hammer drill and drill some 3/16 holes into your sidewalk and put some bent nails with a fender washer on when...