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Chebanse, IL..... | Let's say you were going to pour a 56' x 75' x 8" pad inside a shed on a gravel floor using rebar reinforcement. How long would you let it "set" before driving any 20-40K # farm equipment OVER it?
How long would you let it cure before PARKING any 20-30K # farm equipment over it?
How long would you let it cure before PARKING any 80K loaded trucks on it?
Again, this is inside a shed...no sunlight drying.
Thanks |
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| Ron, we just finished pouring the last of the floor in our shed. Concrete man said wait 7-10 day before pulling any heavy equipment in on it. We waited the 10 days before pulling the tractors or combine on it. Haven't parked any loaded semis in it yet. |
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Agent Orange: Friendly fire that keeps on burning. | Inside a shed with no sunlight drying is good. As long as concrete doesn't dry, it is continuing to gain strength and will for at least 100years. Here is a graph that shows strength for time curing:
As you can see, the slab will have about half it's strength after five or six days. 28 days is for all practical purposes going to be nearly at its max. That is if its not allowed to dry. If you let it dry, all bets are off. |
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NC Iowa | Maybe XIX will.chime.in, but I did it.last Tuesday and am waiting 3 weeks. Fall is coming and wanted to be able to.drive on it by then. |
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Near-north Ontario, French River | I'm curious as to why you are going with 8inchs. We just signed a deal on a 48x64 , all the quotes we received spec'd out 6" floor. All the builders said we'd be fine parking loaded trucks on it, 140k trucks. Not saying you are wrong going with 8" though, perhaps you have a valid reason for going thicker. |
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Coldwater, Michigan | 8 inches used to be the DOT spec'ed depth with Rebar.
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Sac & Story county IA | We did my shop floor on August 6. Next week the lathes, drill, mill, and shear are going back on it. I just wish I knew how to get them there? |
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South-central Nebraska | Brother is a concrete contractor. Wait two weeks for the heavier loads.
If I build a building it will have 8 inch reinforced concrete. |
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Ohio | 28 days. NO LESS! |
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deep SW On. | Thud - 8/31/2013 11:21
I'm curious as to why you are going with 8inchs. We just signed a deal on a 48x64 , all the quotes we received spec'd out 6" floor. All the builders said we'd be fine parking loaded trucks on it, 140k trucks. Not saying you are wrong going with 8" though, perhaps you have a valid reason for going thicker.
If you don't mind who is doing your cement floor ? Are you going wire or rebar? We just got our B and A gravel in a week ago and compacted (12" after stripping topsoil) .... TIA |
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Central Kansas | I had a 60x60 floor poured in my shed, 8 inches thick, wire on chairs and was told to wait 14 days and then could drive anything on it. Longest 2 weeks ever......d:>) |
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Sunnyside, WA | Poured 6" thick, no rebar on the end of silage pit. Waited 7 days then drove the 28,000 lb payloader on it. Just poured 80 more yards added to it and will be driving loaded tmr wagons on it after 7 days. Tractor and tmr weigh ~90,000 loaded
The longer you wait, the better. Concrete will crack. It has to. If you saw joints, it just limits the crack to mainly where the joints are located. |
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| E718 - 8/31/2013 10:38
We did my shop floor on August 6. Next week the lathes, drill, mill, and shear are going back on it. I just wish I knew how to get them there?
Rollers |
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| The longer you wait, the better. Concrete will crack. It has to. If you saw joints, it just limits the crack to mainly where the joints are located
And how do you build a water tight "pit" if concrete cracks |
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Ohio | Have you thought about pieces of poly under the bases and sliding the units in place ? Or just simply using a forklift . |
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| takes 28 days for it to full cure |
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| 28 |
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| My concrete guy is the fussy and he said a month would be best so that's what I did. |
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| easy , poly under it!!! I am a strong believer by putting plastic under a slab, that it is harder and stronger in the end because the concrete cures slower because the water only can come out of the top...thanks |
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Near-north Ontario, French River | Slyvester is doing the project for us, I believe he has his own( in house) concrete crew. The are using wire mess. Because of the location and fall of the dirt in the area we are having to do 24" minimum compacted gravel to get the barn above grade for drainage purposed. Supposed to start construction in mid October. I'm hoping sweet corn harvest is over by then so I can be around to watch the barn go up and take photos. |
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| How long do you want it to last? For those loads I won't stand behind it unless you stay off
it for 28 days. If you're in a big yank 21 days would be the absolute minimum. Concrete is a big
expense but most guys treat it like an after thought. I am never suprised when we drive past
a job and see semis, 4wds, and large equipment on our 7-10 day old slab. If you don't
mind the cracks drive on it tomorrow, if you want it to last and look good as long as it should
follow your concrete guys reccomendation, or 21-28 days. For the "I waited untill the last minute and
need to drive on this in 7 days" jobs we pour a 7 sack high early mix. About $10 more per yard but holds up to the abuse.
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Sac & Story county IA | I moved the mill off the floor with a forklift. Raised mast, back end of forkilift off ground instead of mill. Pushed back end of forklift with loader side to side to steer. Looking for a better way.
Same deal with lathe, loader on 4840. Back end of tractor off ground. Had to set load down to steer front wheels. How much will front axle take before failing? I don't want to find out. |
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EC IL | Always waited 3 weeks, 4 if you can |
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Kingston,Mi | When I inspected USDA funded conservation practices, I would have reviewed Michigan construction practice std. 158, reinforced concrete. It has all of the items that I would observe and check of as having been completed correctly or need rework. Item 11 on the last page allows you to place or use heavy loads on concrete once it has reached 65% of design strength, 2 methods of determining this are allowed. The first is by breaking a cylinder of concrete prepared according to the appropriate ASTM testing standard and the second by observing the internal temp for a specified number of days.
Ed Boysun attached or included a graph of a typical strength curve and it shows the curve very near 65% at 7 days and above 80% at 14 days. We normally specified 3500 psi concrete with air for any job might experience freezing during its life span. We made cylinders at each of the training sessions we conducted as engineers and engineering technicians while training field office staff. Our results would fall along that general curve and most of our cylinders would break above 5000 psi with a 3500 specification at 28 days.
With good quality sub base, concrete and placement, I myself would not be afraid to start loading it at 14 days, light loads at 7 days. Attached is a link to the reinforced concrete construction specification, it has to meet American Concrete Association and Portland Concrete Association requirements or the Federal Government could not cost share. I am a trained and now retired NRCS civil engineering technician with specific training in concrete construction, inspection and had,when employed, approval authority equal to many licensed civil engineers.
www.nrcs.usda.gov/internet/FSE_DOCUMENTS/nrcs141p2_023436.pdf , this should open a search page in your browser , then open the pdf. |
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East of Dowagiac Michigan | That site looks familiar. |
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SW Ohio | We have been moving ours with a hand pump up pallet jack, but maybe not as heavy as yours?? our Telehandler is good for 3500# maybe a little more? Got a buddy with a bigger forklift? |
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Sac & Story county IA | "Got a buddy with a bigger forklift?"
Yup, I just haven't told him, yet.
That mill must be right around 6,000. |
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Chebanse, IL..... | Thud
Locally they pour village sidewalks to 5". Probably hold 250# people @ the most. |
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| It's between Marcellus and Dowagiac for a fellow nat'r. I'll let him lay
claim to ownership of it if he wants to chime in here. Poured that last week.
Edited by XIX 8/31/2013 22:35
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N IL | In our new shop the concrete man said 1 week for pickups and 4020 sized tractors and 3 weeks for combines and semis. |
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How long to let concrete cure?
