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.
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.
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?
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.
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.
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?
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.
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
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... 🙄
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.
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.
my grandmother made awesome malts with that machine, its probably 100 years old.
Taking reading at different times (15 seconds, 30, 60,...), which value should be considered for the Hydrometer (41, 36, 32)?
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
are these procedures work for a double hydrometer test that is used for dispersive soil?
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?
Is corrected length and effective depth (He) same?
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.
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.
god bless your effort
This was very helpful, thank you very much.
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?
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
Thnx ...can u upload the table
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
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.
thank you scientists. method of demonstration is very nice.............
이 동영상은 도움이 되었다 나에게 많이
Thank you 🙏🏼
thank you very much you really help me
SHAGGY??!?!
Very nice
Thanks
How to take a
Nice sir
Bs 933-8?
Thank you
Very good
Thank you very much.dear sir
print kaisa h ye yr
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.
You didn’t washo out the cup remaing soil sllury
awesome, thanks a lot💖
thank you very much
Nothing lasts forever and u know hydrometers can break, ohhhh yeah
What is a #200 siv?
Nice job guys!
Thank you
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
Thank a lot buddy
You're welcome!
What is the ratio of dispersing solution?
And why are you not cleaning all the mud particles from the grinding container with distill water?
Please which standard is this
ASTM
Thanks for your support sir 😐
much appreciated
how can i contact with this guy ?
and thank you alot
THANKS SO MUCHH!
Thank you
Greaaaaaaaaaaaaaat thank you very much
Voice problem
I think your math is a bit off for finding D.... can you go over it....
Missing some steps
Several key errors in this video. Do not trust this if you are learning to perform this test at work.