You need to allow the dispersion agent more contact time with the material to ensure the individual grains of the material don't stick together. I believe per ASTM, there should be a 1hr pre-soak, however for educational purposes, 15min will work. You should not dump the agent in with the sample and go directly to the blender step.
k is not a constant, it depend upon the specific gravity of the soil and the temperature of the suspension and the liquid's viscosity. The origin of the equation is D = sqrt(30n/980(G-g) * L/t) Where :- n = viscosity value. G = specific gravity of the soil. g = specific gravity of the liquid.
Great walk-through! What is the corrected length? Is it some arbitrary value, or does it relate to the hydrometer above mixture? Or some third option... 🙄
Can we do all of the test without electric stirrer and correction? Using an iron stirrer instead of electric stirrer and use an alternative procedure that make sure we do not need any corrections.
For anyone who may be watching this for educational purposes: Not all hydrometers read from the bottom of the meniscus. I work in a soil testing lab and ours reads from the top. If you are not sure which one yours reads at then you can put it in distilled water and it will read 1.0 at the correct part of the meniscus.
After mixing the air-dried soil with the prepared reagents solution do we absolutely need to pour them through a sieve again? I have read in one document where after using air-dried soil through a 2-mm sieve and for the determination of clay and silt, the suspension was not transferred through a sieve again only for the determination of sand where sand was transferred through a 50 um sieve. Will we lay down the hydrometer and temperature at the same time? When we let stay overnight the prepared solution, do blank treatment needs too? Can we adjust the temperature? If we need 20 degree Celsius and our thermometer is graduated till 30 degree in this case what can we do?
PT in this equation (#3) is the Percent of the Total sample used in this Hydrometer Analysis (around 50g in this video). The material used in this analysis came from the material that passed the #200 sieve in the shaker portion of the gradation test, but is not necessarily all of that material.
why don't you record the temperature of soil solution by thermometer in the measuring glass before you drop the hydrometer down into it? I think the temperature is very significant factor to determine the calculation result
Hi, could you show us different Hydrometer with different scales and different calculation how to determine percentages of clay, silt and sand? Could we operate with the Hydrometer without thermometer, Fahrenheit?
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You need to allow the dispersion agent more contact time with the material to ensure the individual grains of the material don't stick together. I believe per ASTM, there should be a 1hr pre-soak, however for educational purposes, 15min will work. You should not dump the agent in with the sample and go directly to the blender step.
Can confirm.
k is not a constant, it depend upon the specific gravity of the soil and the temperature of the suspension and the liquid's viscosity.
The origin of the equation is D = sqrt(30n/980(G-g) * L/t)
Where :-
n = viscosity value.
G = specific gravity of the soil.
g = specific gravity of the liquid.
my grandmother made awesome malts with that machine, its probably 100 years old.
But the standerd dosen't say to use a glove... its talking a stopper... if the particals passed throgh the glowe, then how u recover ot?
Yes robber stopper
This is very helpful, thanks for uploading
Glad it was helpful!
Great walk-through! What is the corrected length? Is it some arbitrary value, or does it relate to the hydrometer above mixture? Or some third option... 🙄
Generally, the corrected length is the distance from the 0 mark to the meniscus + the meniscus distance to the surface.
This was very helpful, thank you very much.
Can we do all of the test without electric stirrer and correction? Using an iron stirrer instead of electric stirrer and use an alternative procedure that make sure we do not need any corrections.
are these procedures work for a double hydrometer test that is used for dispersive soil?
Taking reading at different times (15 seconds, 30, 60,...), which value should be considered for the Hydrometer (41, 36, 32)?
For anyone who may be watching this for educational purposes: Not all hydrometers read from the bottom of the meniscus. I work in a soil testing lab and ours reads from the top. If you are not sure which one yours reads at then you can put it in distilled water and it will read 1.0 at the correct part of the meniscus.
Perfect
hydrometer cannot be read from bottom meniscus since solution is muddy. we have to take top readings only in this case
After mixing the air-dried soil with the prepared reagents solution do we absolutely need to pour them through a sieve again?
I have read in one document where after using air-dried soil through a 2-mm sieve and for the determination of clay and silt, the suspension was not transferred through a sieve again only for the determination of sand where sand was transferred through a 50 um sieve. Will we lay down the hydrometer and temperature at the same time? When we let stay overnight the prepared solution, do blank treatment needs too? Can we adjust the temperature? If we need 20 degree Celsius and our thermometer is graduated till 30 degree in this case what can we do?
please how did he calculate the percentage passing #200 in equation 3
PT in this equation (#3) is the Percent of the Total sample used in this Hydrometer Analysis (around 50g in this video). The material used in this analysis came from the material that passed the #200 sieve in the shaker portion of the gradation test, but is not necessarily all of that material.
why don't you record the temperature of soil solution by thermometer in the measuring glass before you drop the hydrometer down into it? I think the temperature is very significant factor to determine the calculation result
awesome, thanks a lot💖
Hi, could you show us different Hydrometer with different scales and different calculation how to determine percentages of clay, silt and sand? Could we operate with the Hydrometer without thermometer, Fahrenheit?
thank you very much you really help me
Thank you 🙏🏼
이 동영상은 도움이 되었다 나에게 많이
thank you scientists. method of demonstration is very nice.............
Is corrected length and effective depth (He) same?
god bless your effort
SHAGGY??!?!
Thnx ...can u upload the table
much appreciated
Nice job guys!
Thank you
Thank you
Very good
Thank a lot buddy
You're welcome!
Hi you don't need to take a temperature every hydrometer reading?
For some of the later readings, several hours apart, it's important to make sure the lab temperature is the same, or corrected values should be used.
Thanks for your support sir 😐
Very nice
Thanks
You didn’t washo out the cup remaing soil sllury
What is the ratio of dispersing solution?
And why are you not cleaning all the mud particles from the grinding container with distill water?
Thank you
Nothing lasts forever and u know hydrometers can break, ohhhh yeah
thank you very much
What is dispersing agent? Is it a reagent?
It is something like sodium hexametaphospate
NaPO3 4% 125ml
33g of sodium hexameta phosphate +7g of sodium carbonate
how can i contact with this guy ?
and thank you alot
Thank you very much.dear sir
Nice sir
Bs 933-8?
What is a #200 siv?
Please which standard is this
ASTM
THANKS SO MUCHH!
How to take a
I think your math is a bit off for finding D.... can you go over it....
Greaaaaaaaaaaaaaat thank you very much
print kaisa h ye yr
Voice problem
Missing some steps
Several key errors in this video. Do not trust this if you are learning to perform this test at work.