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Gradation testing of river rock

Gradation testing of river rock

Gradation testing of river rock

(OP)
can rip-rap/river rock be tested using ASTM D422.  THe soil has up to 9" rock.  I wouldnt think you can run a sieve on this material, but if not how do they determine the gradation?

RE: Gradation testing of river rock

ASTM C136 is applicable for fine and coarse aggregates, however labs might limit their upper size limit to 3" to preclude a huge sample size required for larger materials.

RE: Gradation testing of river rock

We use 'normal' ASTM testing techniques for materials similar to what you have described. For your aggregate size, a very heavily loaded pickup is about the right sample size. A fair bit of work.  We have obtained gradation analysis for samples with occ. boulders up to 3 feet,  required a very full dumptruck load. Those (7 samples) was a lot of work.

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