As Previous OPS Standard, The pavement compaction (Field density)requirement is 92-96.5%. As the concrete placement which there should be air content if the concrete placement exposed to the freezing condition. The asphalt 92-96.5% has be understood this way for a long time. Now the OPS standard...
As a consultant we cast and test the concrete cylinders. recently cylinders from a high rise construction site have some low 28-day strength. from time to time I can see the supplier casting their cylinder too onsite. Even though the situation has not be improved. about 30% of the specimen still...
This is a imaginary question. In a discussion forum one guy talked about differential settlement for a house addition against original portion. I am a geotechnical person. My feeling is that what he spoke are not in point by enlarging the problem.
His main concept is that all house will need a...
When testing a granular material, it required to test portion passing 19mm sieve (26.0mm for Ontario). How much material is needed for the moisture testing for such grain size material? Many times the curve appear in odd shape due to the moisture results. What is your comments
Hello everyone,
A couple of times my boss mentioned a simplified hydrometer method. He said the method I use is very old and costly. But I am sure the way is still in the standard. He can not remember the exact name (may have phrase overnight). I search internet and have nothing clue for such...
It is noticed that the ASTM has formulas for:
A - the rectangular shape of (1) general and (2) H=2D
B - the tampered shape of ONLY H=2D
Unfortunately our vane is tampered with d=1 inch, D=2 inches, H=5 inches. Is there a formula for this Vane?
I have never used the Sodium Carbonate before for the test. I have alwasys made the solution on the day I need. The pH of the disperse solution of the one I made today was 6.88. (48g/L). Why it is so low or it is suposed like this. I need Sodium Carbonate, right? I checked my supplier websites...
These days I am reviewing result for the proficiency program of year 2010. My hydrometer test results are bad. Percent passing 20 um is 63% (Mean 70.6%), 5um 35% (mean 44.6%) and 2um 21% (mean 30.5%). I have no clue so far what have happened. The only thing seems to be one reason is the Hc...
I have a question in regard borehole log design. Can I have the left orright, or both lines of a column stop any indicated place below the topline of the header? I want to draw a horizontal line for several columnsand give a common name of SAMPLE for instance above this drawn line, andalso have...
I like to continue the discuss starting with the thread "Grain Size Distribution by Hydrometer".
According to the Ontario standard. The soil will be oven dry at begining. after having the total weight, the sample will be grinded with a pestle. Sieve it over 2mm sieve. The portion retained will...
Ontario Provincial Standard says that you should check the hydrometer dimensions (L1, L2, Vb, A) yourself, because the ASTM does not specify the dimensions.
I have found that universally used dimensions (L1=10.5, L2=14, Vb=67) are different from what I measured. especially the Vb ( Volume of...
