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Old 07-17-2016, 10:41 AM   #1
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What Spec. of Concrete Strength for a 6" Thick RV pad?

We have engaged a contractor to pour a new driveway and parking pad suitable for a Class A or fifth wheel to drive over and park on that will not crack.

Our spec is described as:

Provide and use sufficient rebar and concrete to a depth of 6” suitable to allow heavy Recreational Vehicles of type Class A and 5th wheel to drive across without cracking or damaging concrete

We have agreed a height of six inches plus rebar and he is using a road base of crushed fines that looks like sand.

Given that I have just six inches of concrete depth, what specification of concrete should he be providing to sufficiently meet the requirement please?

I'm looking for specific guidance on type of concrete to pour and rebar please, (not recommendations to increase the depth of concrete).

Thank you
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Old 07-17-2016, 10:56 AM   #2
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your concrete contractor should know exactly what mix is required to meet your needs. If not, you need a new contractor.
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Old 07-17-2016, 11:17 AM   #3
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Originally Posted by davel1971 View Post
your concrete contractor should know exactly what mix is required to meet your needs. If not, you need a new contractor.
Yes agreed. That is why I Am asking - to check before the job. Do you know the answer please?
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Old 07-17-2016, 11:27 AM   #4
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Rebar, wow. Thats some heavy duty driveway. As the others stated the contractor should be able to rattle off PSI numbers based on, concrete strength and thickness. That are the two factors that determine load ratings. If money doesn't matter, then go with it, otherwise look into mesh, cheaper and serves a similar purpose, without the xtra cost.
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Old 07-17-2016, 11:31 AM   #5
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3500 psi with fiber mesh. As said above the contractor should know. If it wasn't on stone I would go with 8" for that much weight. Control joints every 10' but the rebar should be continuous. Make sure the stone is compacted. Pull a string across the forms in several places and measure down to vetify it is 6" in depth before pouring. Watch the amount of water being added, should be kept to a minimum. verify the mix with the driver before pouring. Recommend a slick finish (float) not a broom finish. Don't drive on the concrete for at least 7 days to allow it to cure and develop full strength.
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Old 07-17-2016, 11:32 AM   #6
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We are happy to be paying for 6" plus rebar and road base but I want to ensure the psi strength is enough. Some of our friends have huge tag axle class A buses and I don't want to concrete to crack if they come and visit.

Just keeping the contractor honest by seeing if others have had this experience and what they used
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Old 07-17-2016, 11:35 AM   #7
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Thanks BBQguy.

We have to take a trip for 2 months after the pour so it will have plenty of time to set and harden.

With rebar in there what is the purpose of the fiber mesh? Would just rebar be sufficient?
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Old 07-17-2016, 11:39 AM   #8
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I'm betting with the proper mix, you don't even need rebar or wire mesh reinforcement. Would be overkill on a residential driveway
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Old 07-17-2016, 12:28 PM   #9
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BBQGuy hit it on the head. After 40+ years in general contracting, that's more than adequate and a good solution. What's UNDER the concrete is more important. Make sure the ground is compacted. Put a layer of 6 mil polyethylene under the concrete before placing it. You can proof roll the dirt by driving your RV over it and looking for soft spots that actually squeeze out when you driver over them. Replace any bad spots you find.
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Old 07-17-2016, 12:30 PM   #10
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First off, you need a good base and drainage. It is impossible to determine what needs to be done in your case without knowing what kind of base you currently have. If you have a clay base and suffer from water issues, you need to build a good base and drainage before you even think about concrete strength.

lets as an example say you have a sandy loam condition that is currently a grassy area and you want to make a concrete pad to park your motorhome on. First you need to excavate all the sod and decomposing matter so you can get down to a solid undisturbed base. Then you are going to want to bring in 6" worth of 1" crushed stone or crushed concrete and have it vibrator compacted. Now you are ready for rebar, mesh, etc, make sure it is installed on stands, just having the concrete guy pulling it up into the concrete as he pours it won't do because it will get pushed back down as they walk around in the concrete. Once the rebar is in, you are finally ready for concrete, be forewarned though, that the amount of water and the length of time the concrete has had a chance to cure while in the cement truck will make a difference in the final yield strength.

Here is an article that will give you some idea on what is involved in determining concrete yield strength.

http://www.ce.memphis.edu/1112/notes...mix_design.pdf

What I would suggest is find out how much weight you plan on putting on the driveway. i.e. the weight of your fully loaded class A motor home,

Get apples to apples detailed bids from several REPUTABLE concrete conractors on what strength concrete they will be using, what size rebar and on what centers, how many layers of rebar, etc.
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