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 > Concrete driveway thickness??

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Posted: 07/16/20 05:28pm Link  |  Quote  |  Print  |  Notify Moderator

[emoticon][emoticon]
valhalla360 wrote:

The compression strength won't have a lot of impact. The stress cracks form due to tension not compression and concrete is lousy in tension. Thickness and a good compacted base is where it's at.



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map40

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Posted: 08/12/20 07:53am Link  |  Quote  |  Print  |  Notify Moderator

ppine wrote:

Concrete highways are normally 4 inches thick to stand up to truck traffic. Call some contractors and ask them. You might be right on the margin of safety.

Concrete highways are designed for military vehicles, and they are thicker than 4 inches.


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map40

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Posted: 08/12/20 07:55am Link  |  Quote  |  Print  |  Notify Moderator

I have a 40 feet Alfa and a 4 inch concrete slab extension. One of the jacks broke the concrete in a month. I would say 6 inches.

Retired JSO

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Posted: 08/12/20 09:27am Link  |  Quote  |  Print  |  Notify Moderator

ppine wrote:

Concrete highways are normally 4 inches thick to stand up to truck traffic. Call some contractors and ask them. You might be right on the margin of safety.


Driveways are usually 4” thick. Concrete roadways are 8”-12” thick with lots of rebar.





tropical36

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Posted: 08/12/20 11:15am Link  |  Quote  |  Print  |  Notify Moderator

Retired JSO wrote:

ppine wrote:

Concrete highways are normally 4 inches thick to stand up to truck traffic. Call some contractors and ask them. You might be right on the margin of safety.


Driveways are usually 4” thick. Concrete roadways are 8”-12” thick with lots of rebar.

It had better be a good re-enforced 4", if driving a big MH over it.
My next one, with be 6", just to be sure.


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rgatijnet1

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Posted: 08/12/20 01:07pm Link  |  Quote  |  Print  |  Notify Moderator

As with any foundation, a driveway/parking pad should be designed for the application. Obviously parts of the parking pad will have no weight on it and other parts will bear the weight of the RV. To make the whole pad the same thickness is a waste of money. The edges need to be thicker because they will get the weight of the RV as the wheels pass over it or when parked. Where the leveler pads rest is also an area that needs additional support. Concrete should be reinforced with steel mesh and rebar where the load will be concentrated. It makes sense to make the supporting areas a little thicker, just like any building foundation. I also prefer to use fiber-reinforced concrete to help resist cracking, which may happen anyway. Rather than waste concrete by pouring the entire slab the same thickness, just design the slab for the coach that it is to support.

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Posted: 08/12/20 02:12pm Link  |  Quote  |  Print  |  Notify Moderator

rgatijnet1 wrote:

I also prefer to use fiber-reinforced concrete to help resist cracking, which may happen anyway.


I'e been told by some of our Civil/Structural Engineers that there are two kinds of concrete; the concrete that has already cracked, and the concrete that hasn't cracked yet.... [emoticon]

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Posted: 08/12/20 03:51pm Link  |  Quote  |  Print  |  Notify Moderator

Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness.


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