Liquid Limit Test
Liquid Limit Test
(OP)
Can we determine liquid limit of a soil sample without going through so many trials as in Casagrande test?
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RE: Liquid Limit Test
RE: Liquid Limit Test
RE: Liquid Limit Test
LL= W (N/25)<0.12 (between 15 and 30 blows)
RE: Liquid Limit Test
RE: Liquid Limit Test
RE: Liquid Limit Test
RE: Liquid Limit Test
RE: Liquid Limit Test
What civilperson is saying is that you run the test until you get between 15 and 30 blows (or taps). Then use the formula he gave. The formula corrects to 25. If you get exactly 25 blows, then there is no need to correct.
Example:
You put your sample in the cup and obtain 27 blows, after which you put the sample into the oven and obtain a 35.7% m.c. Then, your results would be as follows:
LL = 35.7 x (27/25)^0.121 = 36.03 (or LL = 36).
civilperson uses a range from 15 to 35. We limit our range between 21 and 29. Some use 22 to 28 as a range in which they will use the above to correct to 25.
Hope this helps.
RE: Liquid Limit Test
Hope this helps.
f-d
¡papá gordo ain't no madre flaca!
RE: Liquid Limit Test
1) Multiple trials with number of taps/blows at both below and above 25 with a curve fit or average.
2) AASHTO method of one trial with numerical adjustment to equal moisture at 25 taps/blows.
RE: Liquid Limit Test
RE: Liquid Limit Test
Would the three point method be primarily for soils that are borderline? Or for all types?
RE: Liquid Limit Test
We do multiple trials because you get better results and it's easy. Come on, it's mud pies for grownups! Once the mud is made, the time for extra taps and taring out weight cups isn't that hard.
f-d
¡papá gordo ain't no madre flaca!
RE: Liquid Limit Test