Gravel driveway help.
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    mjncad's Avatar
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    Gravel driveway help.

    My neighbors and I just finished installing new driveways consisting of 3" uncompacted CDOT (Colorado DOT) #6 recycled concrete road base that I compacted with my tractor. This was followed by 3" uncompacted 1" x 3/4" recycled concrete rock. My neighbor compacted his with his pickup, and I rented a 5-ton vibratory smooth drum roller for aggregate/dirt compaction for mine.

    All looked great for a while...a short while before the stuff started squirming and moving on us. Now it appears we've traded our old mud bog in winter driveways for another problem, namely bogging down in the rock.

    The road base compacted wonderfully; but looked like crap. The rock top layer compacted nicely, looked like we wanted it to; but isn't staying compacted.

    I have a few tons of left over road base I'm thinking of spreading out on my driveway in hopes of getting it into the spaces between the rock to help lock it together.

    My neighbor's driveway is about 3,800 square feet, and mine is about 4,050 square feet.

    Any thoughts on how to cure our problem?

    Thanks!
    I have more ideas than ambition.


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    Rock doesnt usually compact worth a squat....well, it will compact to a degree, but without a "binder" like sand, it will always be "squishy"... I dont think you can get it to be only rock and have it locked into place.
    The place where I get my materials has crushed concrete...screened 1.5" Minus. (Includes fines)...and from what he said, once you spread it out and tamp it down, after a couple good rainstorms, it makes a super nice & hard base. Perfect for driveways, the one drawback is asthetic...repairs are not hard to make, BUT they will never totally blend in.

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    mjncad's Avatar
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    Thanks Dave. My next step is to use the leftover road base I have, which is mostly fines to fill in the gaps. Now if we would only get a good rain; but that's not likely to happen anytime soon.
    I have more ideas than ambition.


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    Brian's Avatar
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    Do you have any pictures of this getting built? Sometime down the road I plan to move to the back of my property. That would mean a 1300 foot driveway. So I am very interested in how it goes together.



    Brian

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    mjncad's Avatar
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    Brian:

    I have pictures; but I need to put them into a Picasa photo album that I plan to do after all is said and done...or nearly done.
    I have more ideas than ambition.


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    I will usually build up my base to the desired height and shape and compact it with a loaded gravel truck. Give the truck driver a $20 and ask him to roll over it before he drops the last load of gravel. The top layer of clean gravel should be very thin(about one rock high). More than this and the vehicles have to plow through the gravel. For small jobs such as yours I would run my plate compactor over it to help pack it down.

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    mjncad's Avatar
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    I placed 10 - 12 tons of leftover road-base today, and blended it in with the loader bucket and rear blade, wetted it down and compacted it with the tractor. The initial results are promising.
    I have more ideas than ambition.


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    Brian's Avatar
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    Did you put down a mat below the stones to stop them from sinking into the sand/dirt?



    Brian

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    mjncad's Avatar
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    I was thinking about it; but the driveway that was there already consisted of a compacted mix of road base and recycled asphalt. Then we put 3" of recycled concrete road-base over the existing driveways, compacted that before putting the rocks down. So far spreading the leftover road-base I had and mixing it into the rock and compacting that seems to be solving the problem. Since a good rain isn't forthcoming, I'm watering the area down now and will compact again. Then I'll get another 10-tons of road-base and do the same thing for the part of the driveway I didn't have enough leftovers to do.
    I have more ideas than ambition.


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    mjncad's Avatar
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    An update. I put down 10-tons of 1/2"-minus crusher fines the other day and mixed it in. I still need to do some touch up work; but so far, so good.
    I have more ideas than ambition.


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