Engineering standard to determine if DOT has been under/over testing highway during construction
Engineering standard to determine if DOT has been under/over testing highway during construction
(OP)
Hello everyone,
I have been given the task of determining whether the DOT I work for has been under/over testing a highway section. I have been referred to Standard E122-09, however this appears to be a standard to determine appropriate sample size to determine a mean based on a single lot. However I am required to determine over/under testing for multiple lots, i.e. a whole highway section.
How do DOT's determine how many samples to take during highway construction? I think that it essentially the crux of my question. Is there a standard that outlines this clearly?
Thank-you!
I have been given the task of determining whether the DOT I work for has been under/over testing a highway section. I have been referred to Standard E122-09, however this appears to be a standard to determine appropriate sample size to determine a mean based on a single lot. However I am required to determine over/under testing for multiple lots, i.e. a whole highway section.
How do DOT's determine how many samples to take during highway construction? I think that it essentially the crux of my question. Is there a standard that outlines this clearly?
Thank-you!





RE: Engineering standard to determine if DOT has been under/over testing highway during construction
RE: Engineering standard to determine if DOT has been under/over testing highway during construction
You're on the right track but you might want to call or search other DOT's to ground truth your process. That information is also available through the internet. Search for Florida, Kentucky, Iowa, Wisconsin, Michigan, Washington, Texas, and California. They all have lots of info online.
RE: Engineering standard to determine if DOT has been under/over testing highway during construction
Dave
Thaidavid
RE: Engineering standard to determine if DOT has been under/over testing highway during construction
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RE: Engineering standard to determine if DOT has been under/over testing highway during construction
RE: Engineering standard to determine if DOT has been under/over testing highway during construction
Yes we are testing sample materials - concrete and soil/clay etc. are what I am mainly concerned with.
I am working for a DOT and as an almost graduate engineer (only a few subjects left), I have been given this project. I'm learning lots as I go, but I have been thrown into the deep end a little bit.
With concrete sampling, I have been given a bit of a rundown by a professor, unfortunately the contractors sampling wasn't taken uniformly to make it easy on me (i.e. every x cubic yards or yards length, so a lot of what I'm doing is a little rough).
Thank-you all for the advice, it's much appreciated. I have been following your advice, asking others and looking up other DOT samples and I had a read through the ACOE specs as well.
The thing is - without volumes associated with the soils I think I'm a little stuck. Right now I'm working on proctor graphs for moisture/dry density. I was going to try and relate the number of tests in a lot to an increase in a parabolic curves R^2 value. Does that sound reasonable?