[asshat]

thank you, sir
i was just trying to save the phukker a little scratch, he seems to have finacial constraints

can he not use concrete mesh in place of the rebar??
if not, why not??
can he go high in the middle and maybe get by with about seven yds??
this could save him a few hunnert bucks

concrete costs about $60 a yard, so if you are really tight, you could thicken up the areas where the wheel weight would be a thin up the areas outside of the wheel path. That's why back in the old days people just poured two runners instead of a full driveway. But, when it comes to using a 20 foot wide drive, you never know where the load could be. I would spend the money and do it right.

If you do thin an area, then you want to dummy joint in the thinnest section, since that is where the concrete is most likely to crack. All the dummy joints do is to control the cracking and keep it in straight lines. Its going to crack in the weakest spot (on a pattern of twice the distance in feet as the thickness is in inches). So, if you are pouring 6 inches thick, you dummy joint on 12 foot spacing. If you pour 4 inches thick, you dummy joint on 8 foot spacing.

He could use wire mesh. It is a little harder to use since it comes rolled up and is hard to get flat. You want the steel to be in the center of the slab. It is hard to get a roll of mesh flat and perfectly in the center of the slab. While pouring, the guys walking in the wet concrete tend to stomp it to the bottom. Then it does you no good.

[snarg]

yes, you have to grab it and pull it up (the mesh)
but i suspect he has never tied rebar
i don't think he will buy concrete for 60 a yard, his price will be higher than yours
can he use that fibered stuff, would that help him??