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What density to use for road material if...

What density to use for road material if...

What density to use for road material if...

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...


RE: What density to use for road material if...

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!


ípapß gordo ainÆt no madre flaca!

RE: What density to use for road material if...

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.

RE: What density to use for road material if...

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.

RE: What density to use for road material if...

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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