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Green Building Bible, Fourth Edition
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General: Which cement and lime to buy? And are proportions weight or volume?

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    • CommentAuthorShevek
    • CommentTimeApr 25th 2013 edited
     
    Engineer has specified 1:1:6 cement/lime/sand for our mortar.

    Can we get Mastercrete-type cement and add lime or do we need to get standard cement if we want to add lime?

    When mixing proportions is it meant to be based on volume or weight (a little debate we're having here).
    • CommentAuthorRoger
    • CommentTimeApr 25th 2013
     
    Hi Shevek,

    What is the material that the engineer suggests this mix for? Presumably the lime is in there purely as a plasticizer? If it is meant to be a lime mortar e.g. for bedding stone, omit the cement.

    Roger
    • CommentAuthorShevek
    • CommentTimeApr 25th 2013
     
    Hey Roger, no it's not a lime mortar, lime's just a plasticiser I think.
    • CommentAuthortony
    • CommentTimeApr 25th 2013
     
    volume proportions and I wouldn't use mastercrete and lime, opc and lime
    • CommentAuthorShevek
    • CommentTimeApr 25th 2013
     
    Thanks Tony.
    • CommentAuthorbeelbeebub
    • CommentTimeApr 25th 2013
     
    Just to chime in:

    I think the lime is there as a plasticiser to make the mortar easier to work.

    The mastercrete "blue" has a plasticiser in it so we didn't add lime just 5:1, but I found the biggest difference was in the sand. The first batch had a much larger percentage of the coarse particles relative to the fine ones and the resulting mortar was a bit tricky to work with. the next batches (we switched) had a higher percentage of finer stuff in it and the mortar was a joy to work with, stuck to verticals, would knock down easily then firm up so the block didn't jiggle around.

    Also the mastercrete stuff comes in plastic bags so you get much less spoilage of cement and storage is much easier.
    • CommentAuthorShevek
    • CommentTimeApr 25th 2013
     
    I'll check with engineer if he's okay with Mastercrete. I'm sure he will be.

    So if we get lime should we get hydraulic or hydrated?
    • CommentAuthorShevek
    • CommentTimeApr 25th 2013 edited
     
    Bought some Rugby Premium cement that I was told is equivalent to the Mastercrete. Going to mix a ratio of 1:5/6.
    • CommentAuthortony
    • CommentTimeApr 25th 2013
     
    mastercrete et al only contain 2/3 cement 1/3 filler plasticiser etc or at least I was told that their finished strength is only 2/3 as strong as opc -- might just be an old builders tale.

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