Compaction not meeting specs
Compaction not meeting specs
(OP)
Trying to perform compaction for a gas commpressor site. Proctor is 145 4.3 -2% +3% . Running with a 2 1/4- that really looks like a 3- to me. Material is running very dry 3.0-3.8. running with a 9" lift with vibratory roller and getting a occational compaction, with 2 hours compaction. How do I get compaction consistitcy with less roll time, or is a pad foot roller an option. Product is also boney, with the gradations on there high limits. Ready to pull my hair out!!!





RE: Compaction not meeting specs
Are you certain that the oversize correction was done properly on the Proctor? With this gradation of stone, very little of the actual material was used in the performing the Proctor and a significnat amount of the Proctor value is oversize correction.
You also don't indicate if this is a modified or standard Proctor or what the required percent compaction is.
How is the material behaving during compaction?
Mike Lambert
RE: Compaction not meeting specs
RE: Compaction not meeting specs
Dik
RE: Compaction not meeting specs
It seems like this is a rather open-graded aggregate. Such aggregate should be governed by a relative density spec rather than a relative compaction spec. I just can't believe you got a proctor on an open-graded aggregate unless (as already mentioed) most of the oversize material was removed.
For open-graded aggregate, I'd just use a method spec - you know, 2-ft lift, 10T vibratory, so many passes and BAM, it's good!
Just out of curiosity. . . What are you building and what's the consequence of failure if the actual placement is 5 percent under the specification requirement? Sometimes it helps to put things into perspective. . .
f-d
¡papá gordo ain’t no madre flaca!
RE: Compaction not meeting specs
Try to find a container suitable for all of the material, since stone corrections sometimes are way off, especially if more than 40% stone. Then, compact the stuff in that container with the same energy per cubic foot that is applied in the Proctor mold. That would be your Proctor as long as you don't break down gradation to a different gradation even there.
Are you using a nuclear density testing device? If so, is is calibrated for the material you are compacting? Your problem may be that form of field density test. You may have to devise a different form of field density test, such as a small test pit lined with thin plastic and filled with a material of given density, such as water. If the water to the material when compacting doesn't help the density, your testing is likely wrong.
I loved to come on these jobs of a competitor. After the testing was found wrong, I got a new client.
RE: Compaction not meeting specs
1. Make sure the moisture content in place is above optimum by about 1-1/2 to 2 percent. Compact as the material is drying back toward optimum.
2. Be sure that the Proctor was run correctly and with appropriate top size compensation.
3. If the material is friable, pay attention to what OldestGuy noted...the material can be breaking down during compaction, which renders the test inaccurate.
4. Make sure that the density test method matches the material. Some materials cannot be accurately tested with nuclear density gages; particularly the moisture content. Validate with direct volumetric comparison (sand cone density).