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Sand/gravel/Portland ratio?

Discussion in 'Hardscaping' started by D Felix, Jun 4, 2007.

  1. D Felix

    D Felix LawnSite Bronze Member
    Messages: 1,898

    I need to know the ratio for sand, gravel and Portland for mixing cement. It's not going to be enough to call for redi-mix, but since we already have gravel and sand on-site, a bag of Portland will be cheaper than Quikrete... I've looked on-line but couldn't find anything even close. Just need something to get me started- I can tweak it from there.
  2. richallseasons

    richallseasons LawnSite Senior Member
    Messages: 479

    mixing in a wheel barrow? 10 sand 4 portland 2 lime stone to suit....mixing in a mixer 30 sand 1 bag portland 1/2 bag lime and stone to suit ..... the numbers are shovel fulls
  3. D Felix

    D Felix LawnSite Bronze Member
    Messages: 1,898


  4. forestfireguy

    forestfireguy LawnSite Senior Member
    from nj
    Messages: 601

    Quickrete........ready mixed.
  5. orionkf

    orionkf LawnSite Member
    Messages: 122

    what's the application?
  6. ChampionLS

    ChampionLS LawnSite Bronze Member
    Messages: 1,066

    What???? lol wheres the stone?
    Cement has no strength, unless you add stone. (rock-lock connection)
    3,000 psi concrete 1 portland, 2 stone, 3 sand.
    4,000 psi concrete 2 portland, 2 stone, 3 sand.
    best to use 5/8 stone when using small mixers or by hand. Otherwise use 3/4 clean.
    Tip : You'll never make good concrete with a wheelbarrow. (unless your Arnold Schwarzenegger) you'll goof up and add too much water and weaken the mix. Go rent, or buy a mixer.

    I have a Belle electric one (the ones that Home Depot rents) I'll mix a full wheelbarrow at a time, and you can easily store it in a trailer. Great for Belgian block, curbing , sidewalk fixing, or applying cultured stone.
  7. D Felix

    D Felix LawnSite Bronze Member
    Messages: 1,898

    Application is for abutments for a small bridge.

    Quikrete is too expensive for what you get, and I really question the 4k psi rating on the bag.

    Champion- richall said "stone to suit". I was planning on putting it in! :) I'll be fine mixing in a wheelbarrow- I've done it plenty before and I think I can handle it.
  8. cgland

    cgland LawnSite Bronze Member
    Messages: 1,929

    He must know how weak you are Dan!:weightlifter:

  9. Dirt Digger2

    Dirt Digger2 LawnSite Silver Member
    from PA
    Messages: 2,396

    we use 2 1/2 buckets pea gravel, 2 buckets sand, 1 bucket cement ratio when we make concrete risers for our septic tanks...put it into a mixer and then pour into forms...works well...if your using sand and cement use 3 parts sand to 1 part cement
  10. ChampionLS

    ChampionLS LawnSite Bronze Member
    Messages: 1,066

    Pea gravel will work as a filler for concrete, but if it's a round stone, I would avoid it, as the cured concrete will not bond to it as well as a coarse angular stone (bluestone). If you need really strong concrete for supporting a bridge as you say, I'd go with the 3/4 blue. If your supports are in water, you should use a addmix to make them waterproof.

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