Ben8n

IF you 45 it the edges will become weak and will crumble over time.

itsreallyconc

maybe for you but we've never had the problem w/our material of choice,,, however good conc practices should apply til 1 gains experience w/polymer-modified mtls & you find out what you can & cannot accomplish.

IF 1 selects apron store grade stuff, i agree - edges will degrade depending on point & tire loading

gembob

Okay I'm going to give it a shot this weekend - just one more thing I wanted to add, I saw in itsreallyconc's post a mention of this only being 5 or 6 sq. ft. I think the pictures might be deceiving. The entire "hole" I'll call it, is only 1-3inches high in most spots and maybe 2-2.5 feet across, its really pretty small. Does that change the approaches you've outlined or same approach smaller quantities?

itsreallyconc

you might consider ' extending ' the volume w/CLEAN washed aggregate ( landscaping pebbles sold in plastic bags - garden section of any apron store ) IF its that ( 3" ) deep,,, that will give you more yield w/o compromising the compressive strength of your mix.

but you sound as if you're capable of 5th grade math, right ?