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Liquid Limit Formula:
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The Liquid Limit Calculation Formula is used in geotechnical engineering to determine the liquid limit of soil, which is the water content at which soil changes from plastic to liquid state. It's a fundamental property for soil classification and engineering applications.
The calculator uses the Liquid Limit formula:
Where:
Explanation: The formula calculates the liquid limit based on the water content measured at a specific number of blows in the Casagrande cup test.
Details: Liquid limit is crucial for soil classification, determining soil consistency, and predicting soil behavior under different moisture conditions. It's essential for foundation design, slope stability analysis, and construction planning.
Tips: Enter water content in percentage and number of blows. Both values must be positive numbers (water content > 0, blows ≥ 1).
Q1: What is the significance of 25 blows in the formula?
A: The formula is normalized to 25 blows, which is the standard reference point for liquid limit determination in soil testing.
Q2: What are typical liquid limit values for different soil types?
A: Clays typically have LL > 50%, silts 25-50%, and sands < 25%. High LL indicates high plasticity and compressibility.
Q3: How is the water content (w_N) measured?
A: Water content is determined by measuring the weight loss after drying a soil sample at 110°C for 24 hours.
Q4: What is the Casagrande cup test?
A: It's a standard test method where soil paste in a brass cup is grooved and the cup is dropped until the groove closes, counting the number of blows required.
Q5: Are there limitations to this calculation method?
A: The formula assumes standard testing conditions and may need adjustment for unusual soil types or non-standard testing procedures.