When to use T-99 or T-180 Comp Spec?
When to use T-99 or T-180 Comp Spec?
(OP)
Are there any guidelines related to soil characteristics (granular, clayey materials)which favor the use of T-99 or T-180 compaction specs? I have looked in the references I have available and can't find any type of guideline concerning this query. Any help would be appreciated.





RE: When to use T-99 or T-180 Comp Spec?
RE: When to use T-99 or T-180 Comp Spec?
What I recommend is to look both at soil type and what is being supported by the fill. If the structure (be it an earth structure, e.g. berm, or other structure, e.g. building, bridge, etc.) can tolerate deformations that will occur when the fill is not as well compacted, specify T99. If deflections cannot be tolerated to the same magnitude, specify T180.
A great book to read is "Construction Of and On Compacted Fills," by Edward J. Monahan. He explains in very plain terms the Standard vs. Modified compaction issue, specifications, and field investigation.
RE: When to use T-99 or T-180 Comp Spec?
RE: When to use T-99 or T-180 Comp Spec?