How thick should I pour my driveway and parking space for a heavy truck, around 3 or 4 tons so that it dosent?

Question

So that is dosent crack. I need to use as little concrete as possible.

Answer 1

As little concrete as possible means that you will have equally little margin for error, and the basic guarantee for concrete is that it will get hard- and crack.

For that load, 5-6" is the right amount, but still- it will crack. What you need (aside from a stable base) if good steel re-enforcement, in the form of re-bar. Rebar makes a bridge through any crack and prevents the two sides from moving in opposite directions. In addition, if you put the rebar in correctly for the purpose, it can provide a crack resistance quality.

Use 5", preferably 6".

Have a stable, compacted base.

Use rebar- I would recommend 1/2" bars, 24" on center.
around the edges, by digging down another 4 inches in depth and width. Run a double re-bar in the curb- one close to the bottom, one close to the top.

If you don't like the cost of rebar, use 6x6x10 steel mesh in the center, but do the rebar perimeter because cracks start at edges.

Answer 2

First of all you need to start with a good base. If your base ground isn't firm and compacted, it won't matter how much concrete you use...it will crack anyway. So start with a good base, compact your gravel...use rebar or some other kind of reinforcement like wire..... or you could use fiber in the concrete (They will mix fiber in at an extra cost.). Then pour it at least 6 inches and use a good strong concrete mix, like 4000. There is a difference in prices of different mixes too. I hope I've helped.

OH, I almost forgot. Use keyway joints or groove your concrete in large areas to prevent cracking!

Answer 3

Five or six inches should do it as long as the subgrade is adequate.