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  1. #1
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    Thumbs up Compacting Gravel

    How much compaction do you get on gravel after going over it with a plate compactor? If I put down 6inches of 3/4 gravel, is it still 6inches after.
    Put another way, i need 6inches of compacted gravel, how do I determine how much gravel I will use based on compaction?

    Oh, and this site rocks. Lots of great info here. I'm just starting out and there is so much knowledge to absorb here.

    Thanks everyone...

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    we figure compaction at 33%
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    Depending on the size of your compactor, your lift thickness and the base itself all play a part on percentage of compaction.

    If you use a minimum 7000 pound compactor (ICPI Spec.) and do a 2-inch lift you will get 25% compaction as a general rule of thumb. Experience will help you figure out how much compaction you will get. We have a formula we teach in class. If you need it shoot me a line.

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    Rex

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    If I understand right, 2.5inches of gravel will compact down to 2inches. So for a 6inch base, I would be using 7.5inches, brought up in 2inch lifts

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    I never myself order aggregate with compaction in mind. Just find an aggregate calculator online plug in your dimensions and type of stone and that will get you close to what you need. Just bump it up a little
    Josh
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    I typically use a stone calculator then multiply by 1.5 to account for compaction

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    I do not want to hijack this thread but someone above mentioned a 7,000 lb compactor as a minimum (icpi spec). Is this a new number within the last two years? My ICPI spec book says 4 to 5k of compaction force minimum.

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    Quote Originally Posted by Rex Mann View Post
    Depending on the size of your compactor, your lift thickness and the base itself all play a part on percentage of compaction.

    If you use a minimum 7000 pound compactor (ICPI Spec.) and do a 2-inch lift you will get 25% compaction as a general rule of thumb. Experience will help you figure out how much compaction you will get. We have a formula we teach in class. If you need it shoot me a line.

    Peace,

    Rex

    http://ArizonaPavers.com
    Hey Rex, does ICPI recommend 2" lifts with that compactor? We installed 3" lifts with a 5600lb c.f. compactor for years with no issues.

    With that 5600lb. c.f. compactor and 3" lifts, we allowed for 10% compaction and had good luck with that percentage.

    Rex, feel free to post that formula here in the thread.
    Mike

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