Agreed with the sand cone correlation, that is a very good practice when utilizing oven dry samples. Your experience with a +0.7% solidifies what I have been saying, that the gauge gives relativly the same value as an oven/dry or speedie, give or take a %.
When we utilize our sand cone form or...
I have a question regarding the moisture content value that is dispayed on nuclear densimeters.
In our laboratory a discussion was brought up as to whether or not the value displayed for moisture is already corrected for the amount of rock that also is within the tested area.
I have...
PEinc,
We were told that and that does seem to make sense. Thank you
cvg,
We have yet to find a specific spec from any municipality or agency that specifically states that you should do any type of subgrade prep, if you find one I would like a link to it.
Hello everyone,
A topic come up the other day in our laboratory about why there is no requirement as to the preparation of subgrade for box culverts. Our specifications do not dictate to perform any type of compaction, only excavating to the proper grade and then spraying the base if it is dry...
I fail contractors on this all the time. The fact of the matter is this.
They bid the job, and have agreed to do so in accordance with the contract, plans and specifications.
If the specifications call for 6" of scarification and to bring to proctor optimum moisture and compaction, then they...
You're right, I remember reading that in C42, but didn't really think about it, good thing I did not opt for the 2", it wasn't my choice anyway.
As much as the Zircon MT-6 is touted by Luke Snell, I have had hard time locating the pattern, once I find an offset without rebar I stay with it the...
We are using the 4", I cant remember which ASTM # it is, but it basically states that anything less than 2" in diameter will result in lower than expected load results. When using a 2" bit, your specimens ends up at about 1.8-1.9", the bit measurement is from the outside dimensions.
Im no...
I see your point about trying to be right, but if someone constantly goes against ASTM standards with no research to back their claims, how can you use this as actual valid data? One minute he wants to go by such and such ACI code, but then not follow the ASTM procedure. I wish the line of...
Well, the guy has a doctorate degree, so I cannot argue with that, all I have is special inspections certification, but at least I know I am right, even if I have to keep it to myself. I am going to proceed with my method regardless of instructions, and just keep quiet about it. I don't...
Honestly I dont even see why he cares about the rebar being in it, the slab had 2" of cover for the top bars, my core is 10-12" long, I can easily trim it and obtain the proper length to diameter ratio needed for a proper test. In my spare time, I plan on breaking one with rebar and one...
Im a senior materials tech for a local D.O.T.
My latest assignment has brought me to a bridge deck that has some serious cracking issues in the entire slab, there are no prestress members or post tension cables present fyi.
The materials P.E. over our department instructed me to use my coring...
