How do you find the limit of a liquid on a graph?

x) Liquid limit is determined by plotting a ‘flow curve’ on a semi-log graph, with no. of blows as abscissa (log scale) and the water content as ordinate and drawing the best straight line through the plotted points. Report the water content corresponding to 25 blows, read from the ‘flow curve’ as the liquid limit.

How do I find my liquid limit?

Liquid limit is measured by placing a clay sample in a standard cup and making a separation (groove) using a spatula. The cup is dropped till the separation vanishes. The water content of the soil is obtained from this sample. The test is performed again by increasing the water content.

How do I create a limit chart in Excel?

How to chart upper control limit in Excel

  1. Enter your data.
  2. Find the average of averages.
  3. Calculate the standard deviation.
  4. Add the UCL formula.
  5. Add the LCL formula.
  6. Copy the UCL, LCL and average of averages.
  7. Select your data and choose a chart.
  8. Change the chart title and save the workbook.

What does high liquid limit mean?

A high liquid limit normally indicates a high compressibility and a high shrinkage/swelling potential. A high-plasticity index Ip generally results in a low shear strength. A low Ip means that a soil used as foundation will change significantly in consistency even with a small change in water content.

What does the liquid limit tell us?

What is the purpose of the liquid limit test?

The liquid limit test, defined in ASTM Standard D4318, determines the water content at which the behavior of a clayey soil changes from plastic to liquid.

What is U-line in plasticity chart?

A U-Line is also defined as the upper limit of the correlation between plasticity index and liquid limit of the soil. If the test results of soils fall above the U-line then results are considered faulty and experiment should be repeated.

What is the equation of a line in plasticity chart?

The plasticity chart comprises of two important lines, A-line and U-line. A-line is an empirically chosen line which separates the chart between clays and silts; soils that fall above A-line are classified as clays and that falling below as silts. A-line is given by the equation PI=0.73(LL-20).