Standard: AS 1289.3.1.1
Casagrande Method
Particularly designed to determine the moisture content at which clay soil pass from plastic to liquid state, in accordance with Australian Standard (AS 1289) test methods.
Features of Liquid Limit Test Set
- Brass Cup: The cup is made of brass and has standardized dimensions to hold the soil paste during testing.
- Mechanism for Controlling the Rate of Rotation: The cup is attached to a carriage, which is controlled by a motorized mechanism. This mechanism allows the cup to be rotated at a standardized rate during the test.
- Counter: A counter is integrated into the apparatus to keep track of the number of rotations or blows applied during the test. This is essential for accurately determining the liquid limit.
- Grooving Tool: A grooving tool is provided to create a standardized groove in the soil paste. This groove serves as a reference point to observe the soil's behavior as it transitions from plastic to liquid state.
Technical Specifications
| Model Number |
NL 5008 AS / 001 |
| Type |
Hand – Operated |
| Product Dimension |
220 (L) x 168 (W) x 134 (H) mm |
| Approx. Weight |
2.5 kg |
Unit Consist Of:
| Model Number |
Parts Description |
Qty |
| NL 5008 X / 002 – P 001 |
Flat Grooving Tool |
1no. |
| NL 5008 X / 002 – P 004 |
Curved Grooving Tool |
1no. |
| NL 5008 X / 002 – P 002 |
Height Gauge (10mm) |
1no. |
*1 Copy of Manual Instruction
Test Procedure of Liquid Limit Test Set
- Sample Preparation: Collect a representative soil sample and remove any large particles or organic materials. Air-dry the sample, crush any lumps and pass it through a sieve with a 0.425 mm opening.
- Setting Up the Apparatus: Set up the liquid limit apparatus, including the cup, grooving tool, and a mechanism to control the rate of moisture addition. Ensure the cup is clean and dry.
- Weighing the Soil: Weigh a specific amount of the prepared soil sample and place it into the cup of the liquid limit apparatus.
- Adjusting Moisture Content: Gradually add water to the soil sample in the cup, mixing it thoroughly. Use a standardized method for moisture addition, such as a drop-counting device.
- Grooving the Soil: After each addition of water, create a groove in the soil using the grooving tool. The groove should be made along the center of the cup.
- Determining Liquid Limit: Continue adding water and grooving the soil until the groove closes for a distance of 13 mm (0.5 inches). The moisture content at this point is the liquid limit.
- Recording Data: Record the number of blows or drops required for the groove to close and the corresponding moisture content. This information is used for calculations.
- Calculating Plasticity Index: If needed, determine the plasticity index by finding the difference between the liquid limit and the plastic limit (determined in a separate test).
- Cleaning the Apparatus: Thoroughly clean the liquid limit apparatus after each test to avoid any residue affecting subsequent measurements.
- Repeat Testing: Conduct multiple tests using different portions of the soil sample to ensure consistency and reliability of results.
