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What density to use for road material if...

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allthegearnoidea

allthegearnoidea

Civil/Environmental
Joined
Oct 30, 2019
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Hi there everyone,

I got some test results for some quarry material from a supplier for a road material.

Say for example, if I need to put down the quarried material at 102% Standard compaction effort for a 100m x 10m road at 150mm thick... what's the density I'm actually looking at in the test report? What would the working out be besides volume of the road...
100 x 10 x 0.15 x density??

Right now I'm looking at a report that says the Standard MDD for the material is 1.99, at 9.8% OMC... would that mean I'd be going for the Bulk Density? I.e. 1.99 * (1 + .098) = 2.19 t/m3?

I've always used a "rule of thumb" for base courses and sub base materials through out my career... but would like to be slightly more refined...

Thanks!
 
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according to your numbers, you'd look for 102% of 1.99, which would be the dry density. That'd return a value of 2.03 g/cc. At an optimum moisture of 9.8%, that'd return a moist density of 2.229 g/cc, or 139 pcf.

Fun with numbers!

f-d

ípapß gordo ainÆt no madre flaca!
 
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This is explained in soil mechanics books as demonstrated by fd.

The proctor tells you the standard dry density and the moisture content. To get 102% compaction (which is achievable) the standard proctor maximum dry density is multiplied by 102%. Then you add the water content 2.03+2.03x0.098=2.229g/cc or T/m3.

Based on your example above you would have 100m x 10 m x 0.15 m x 2.229 t/m3 = 334 t in place. You should understand that part of the weight is soil and part of it is water, your source material does not come at the optimum moisture content.
 
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john1318....Unless you have cohesive materials in your subgrade or base material, I would not use a standard Proctor as the lab test. I would use a modified Proctor and compact such that the in-place density is 98 percent of the lab Proctor.
 
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Rule of thumb use 20kN/m3 to 22kN/m3 which is a bit less than concrete 24kN/m3. Bearing in mind a well graded material will be denser than single sized aggregate.
 
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