ASTM 422 Help

[djr1897]

Hello All,

I am struggling to successfully run my sieve/hydrometer analysis on this sample. I believe I am following the ASTM perfectly. However, I am not getting the correct numbers. Can anyone provide a brief explanation of how you run your 422's?

ASTM 422 states that material retained on a number 10 can be run using sieve analysis and material passing a number 10 is analyzed using hydrometer analysis. What about everything in between the number 10 and number 200???

Any help and advice is greatly appreciated. Several youtube videos that I have seen show to air dry and pulverize at least 500 grams of soil and run a sieve analysis on that (which includes the number 200), and run hydrometer analysis on the material passing the number 200. However, this is not consistent with what is in the ASTM.

 

[Ron]

First, it is ASTM D422. There are likely other ASTM standards with the 422 designation so the letter designation is important. Second, the standard was withdrawn in 2016 so is no longer a current standard, though many still use it

In the latest approved version (2007) prior to withdrawal, the particles retained on the #200 sieve are to be sieved, while the particles passing the #200 sieve are to be checked using hydrometer analysis. I'm not sure what version of the standard you are reading.

 

[mikeofBelAir]

djr1897 I think you are confused...After running the hydrometer, the sample in the hydrometer jar is washed thru a #200 ( or #270--or whatever) sieve, and dried. Then it is run thru the stack of fine sieves between #10 and #200--or whatever your finest sieve is. You need the hygroscopic moisture to calculate the corrected weight of the solids for the fine sieves.