Gradation testing of river rock

[Chewi00]

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?

 

[DMcGrath]

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.

 

[emmgjld]

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.