I can see the searches people put in to reach my site, and a recurring one is "density of type 1 subbase".  So in my humble option you should use 2.1 / 2.2 t/M3 for aggregate that has a relative density of 2.7 / 2.8 t /M3.  Limestone will be less in proportion to it's relative density as will granite, and some igneous rocks will be more, such as from Hillhouse Quarries in Ayrshire whose relative density from memory is 2.9 t/M3. the lack of facts  is we don't routinely measure subbase density as a criteria so there is not a pile of facts published or in company files. Aggregate relative density can have a large effect on costs particularly  in blacktop if it is density is high, less M3 for the tonne.

2 Responses to “Type 1 subbase density”

  1. Ian February 17, 2011 at 7:24 pm

    Had some feedback on dolomitic limestone today, with a relative density of 2.8 / 2.9 and a maximum dry density of 2.4 and a optimum moisture content of 5% (vibrating hammer test). At optimum and given 95% compaction you should achieve 2.39 t/m3 in the field.
    Perhaps on reflection 2.1/2.2 t/M3 should be 2.2/2.3 t/M3. Had another OMC/MDD done and the MDD of 2.4 is now 2.2, so I’m going back to 2.1/2.2 t/M3 compacted density in the layer.
    Remarkably I’ve had 244 hits on my site for type 1 subbase density and 691 for type one subbase, and that’s not all the search variants such as subbase tonnes M3.

  2. Ian March 20, 2012 at 5:59 pm

    For the first time in my life I am measuring densities of compacted type 1 subbase, we are using type 1 as an import backfill material on the Shetlands gas plant. It’s 4.5kg (method 3.5 BS 1377)dry density compaction is 2.38T/M3, it is a metamorphic rock whose relative density will be between 2.8/2.9T/M3 and we are achieving densities of 2.26 to 2.4T/M3. I will post the relative density later.

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