1. What is Liquid Limit?

Liquid Limit (LL) is the moisture content at which a soil changes from plastic to liquid state. It represents the water content where soil begins to behave as a liquid.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( LL \) — Liquid Limit (%)
• Moisture — Moisture content at 25 blows (%)

Explanation: The liquid limit is determined as the moisture content at which a standard groove in a soil sample closes after 25 blows in the Casagrande apparatus test.

3. Importance of Liquid Limit Calculation

Details: Liquid Limit is a fundamental property of fine-grained soils that helps classify soils, predict their behavior, and determine their suitability for construction and engineering applications.

4. Using the Calculator

Tips: Enter the moisture content measured at 25 blows in percentage. The value must be a positive number.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of 25 blows in liquid limit test?
A: 25 blows is the standard number of blows at which the moisture content is measured to determine the liquid limit according to the Casagrande method.

Q2: How is liquid limit different from plastic limit?
A: Liquid limit is the moisture content where soil behaves as a liquid, while plastic limit is the moisture content where soil becomes too dry to be plastic and begins to crumble.

Q3: What types of soils are tested for liquid limit?
A: Liquid limit is primarily determined for fine-grained soils such as clays and silts that exhibit plastic behavior.

Q4: Why is liquid limit important in geotechnical engineering?
A: Liquid limit helps classify soils, predict their shear strength, compressibility, and permeability, which are crucial for foundation design and construction.

Q5: Can liquid limit be greater than 100%?
A: Yes, some highly organic soils and certain clay minerals can have liquid limits well above 100%.