Compaction specs for crushed Stone Under Foundations
Compaction specs for crushed Stone Under Foundations
(OP)
Our Bridge footing design calls for 12 inches of crushed stone under footings. The stone was selected due to the presence of ground water.
What would be a typical procedure to adequately place and compact the crushed stone and what kind of testing procedures are available? I am familiar with the Proctor test for determining optimum compaction of granular materials; however, I don't think this could be used in this case.
What would be a typical procedure to adequately place and compact the crushed stone and what kind of testing procedures are available? I am familiar with the Proctor test for determining optimum compaction of granular materials; however, I don't think this could be used in this case.
RE: Compaction specs for crushed Stone Under Foundations
RE: Compaction specs for crushed Stone Under Foundations
RE: Compaction specs for crushed Stone Under Foundations
This test is specifically designed for testing cohesionless, free-draining soils where Proctor methods cannot be used. The Bureau of Reclamation (Design of Small Dams) recommends a minimum relative density of 70%.
Rel. density (%) = [Dmax x (Dip-Dmin)]/[Dip x(Dmax-Dmin)]
Dmax = maximum density
Dmin = minimum density
Dip = in place density
Chuck
cgopperton@stantec.com
http://www.stantec.com/
RE: Compaction specs for crushed Stone Under Foundations
Crushed stone without fines, or 'railroad ballast' (the stuff that supports train traffic), will be very much less expensive. I also agree with the GT fabric. I think it will help preserve the structural integrity of the ballast, as the migration of silt/clay will decreace the friction between the angular grains, allowing them to settle.
RE: Compaction specs for crushed Stone Under Foundations
RE: Compaction specs for crushed Stone Under Foundations
RE: Compaction specs for crushed Stone Under Foundations
RE: Compaction specs for crushed Stone Under Foundations