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Roadbase as a substitute for sand and gravel?

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  1. #1
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    Default Roadbase as a substitute for sand and gravel?

    Not for structural use but as a base and brick footing for our proposed firepit.
    We have a credit with our local landscaper due to the cancellation of a pre-paid skip delivery and we are going to be using roadbase under the brick paving that was supposed to have been done before that last lockdown.
    If I did use roadbase as an aggregate substitute what ratio of GB cement would be needed assuming I hire a mixer that is on the small side.
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  2. #2
    3K Club Member johnc's Avatar
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    The road base will almost certainly have clay in it, if it does it isn’t suitable

  3. #3
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    Why not John? Mortar sand has a lot of clay in it and this is only a firepit not foundations. I'll ask the place that we have the credit with tho.
    I did think it was mainly decomposed granite mixed with local gravel.
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  4. #4
    Je pense, donc METRIX's Avatar
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    Quote Originally Posted by Moondog55 View Post
    Not for structural use but as a base and brick footing for our proposed firepit.
    We have a credit with our local landscaper due to the cancellation of a pre-paid skip delivery and we are going to be using roadbase under the brick paving that was supposed to have been done before that last lockdown.
    If I did use roadbase as an aggregate substitute what ratio of GB cement would be needed assuming I hire a mixer that is on the small side.
    So are you asking if you can just mix cement and road base as a footing ?
    I would say not really unless there is fine gained stuff in there as well ?, you really need to add some sand to bulk it out, the sand acts as a binder to help the cement stick to the aggregate, the road base is fine as an aggregate in concrete.
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  5. #5
    Member ForeverYoung's Avatar
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    Quote Originally Posted by Moondog55 View Post
    Not for structural use but as a base and brick footing for our proposed firepit.
    We have a credit with our local landscaper due to the cancellation of a pre-paid skip delivery and we are going to be using roadbase under the brick paving that was supposed to have been done before that last lockdown.
    If I did use roadbase as an aggregate substitute what ratio of GB cement would be needed assuming I hire a mixer that is on the small side.
    I did have that info ... somewhere ...
    But what I worked out was it wasn't worth the trouble.

    Also

    My landscaper supply place, where I get my roadbase, also sells an aggregate mix in the right ratios to which I can just add cement - maybe yours does too?

  6. #6
    4K Club Member Marc's Avatar
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    Quote Originally Posted by Moondog55 View Post
    Not for structural use but as a base and brick footing for our proposed firepit.
    We have a credit with our local landscaper due to the cancellation of a pre-paid skip delivery and we are going to be using roadbase under the brick paving that was supposed to have been done before that last lockdown.
    If I did use roadbase as an aggregate substitute what ratio of GB cement would be needed assuming I hire a mixer that is on the small side.
    Road base is a mixture of small coarse aggregate, fine and extra fine aggregate, to achieve better compaction. Concrete can be made with a variety of size aggregate, including limited amount of fine like brick dust. I believe road base can be safely used to make concrete and I suggest 4:1 road base to Portland cement.

    Having said that, road base is $60 and sand and gravel mix is $80 Not much of a muchness, unless you already have the tuff.
    Science is never settled,
    it advances one funeral at the time.
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  7. #7
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    They do; I was trying to get by with a single delivery but I don't think I can use the bluestone screenings and sand mix as a base for brick paving and the paving is the priority.
    As it is even packing sand is now $85 a cubic metre from where we have the credit, roadbase is only $68-
    "A big boy did it and ran away"

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