[turnpike boy]

Steve, the reason for the 6K psi conc is freeze/thaw resistance. 3K psi won't make it in colder (read: freezing) climates as the expansion/contraction first causes cracks, then scaling and spalling of the surfaces. Pow! - crappy looking concrete; this is further aggravated huge when liberal doses of salt are put on the conc to melt ice.

Joeg, if you figure 15 yds. (20' x 35' x 6"tk. / 27cf/cy) you'll be good for quants - be aware it is very typical for the batch plant to load 26.7 to 26.8 cf/cy instead of exactly 27 cf/cy. And you always want to throw a bit away when done, rather than have a cold joint where you ran out. Wire mesh reinforcement helps keep it together if the subbase isn't perfect and is cheap insurance - now probably $100 a roll, get 2. Trucks usually can hold around 10 yards, so you'll need 2 which ought to preclude small load extra charges. 15 yards @ $160/yd = $2400, add for mesh ($200) and misc ($200+) and you should budget around $3000. That's a budget figure, not final cost.


-Roger