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"stone" or "quarry" dust as structural fill?

"stone" or "quarry" dust as structural fill?

(OP)
Building design requires 5-10 feet of fill to achieve FFE. On-site cut material is CH and MH, very CH and MH. Contractor has proposed using "stone dust" as fill material.

Anyone have any experience with stone dust as structural fill?

Thanks!

RE: "stone" or "quarry" dust as structural fill?

it is very similar to fine sand. As with sand, you would need to verify the gradation and quality of your source material. compaction of sand can be difficult unless you can maintain tight control on your moisture content and gradation to avoid bulking. you might want to do a test fill to work out the best equipment, moisture content, lift thickness and rolling pattern to achieve a good relative density. It would not be my first choice for imported structural fill material.

RE: "stone" or "quarry" dust as structural fill?

I think I have seen a similiar post here a while back, the driver being that the contractor proposing to use this stone dust had a source that would provide it too him free of charge. You might want to make a similar query as to how this suggested supply of product was initiated.

RE: "stone" or "quarry" dust as structural fill?

The first thing I would want to know is the type of stone this comes from. "Stone dust" can mean lots of things, most not too good. Anything free is not likely to be worth much. Not only would this require a lot of testing initially, but testing throughout the filling to ensure that the quality is maintained.

RE: "stone" or "quarry" dust as structural fill?

I have been on projects where stone dust was used as fill to develop the building pad. No problems. Obtaining the Proctor density can be problematic as water wants to pour out of the mold on the wet side of optimum. Optimum moisture (Standard) should be in the 10 to 12 percent range - maybe 9? Friction angle is pretty good, CBR (or correlations to subgrade modulus) are very good. Placement moisture content will likely be low coming from the truck. Our stone dust comes from the quarry as the No. 10 screenings that result from making open-graded aggregate.

f-d

ípapß gordo ainÆt no madre flaca!

RE: "stone" or "quarry" dust as structural fill?

What did the spec say? I bet not dust and it had some kind of gradation.

Richard A. Cornelius, P.E.
WWW.amlinereast.com

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