Understanding the Core Cutter Test Rammer Specifications

The core cutter test is a common method used in geotechnical engineering to determine the in-situ dry density of soil. It is particularly suitable for cohesive or semi-cohesive soils free from stones. The test involves driving a cylindrical core cutter into the ground using a rammer and sleeve.

Indian Standard Specifications for Core Cutter Rammer

According to Indian Standards (specifically IS 2720 Part 29), the equipment used in the core cutter test has specific dimensions and properties to ensure consistency and comparability of results. For the rammer used to drive the core cutter, the standard specifies the following:

• Mass of the Rammer: The rammer should have a mass of 9 kg.
• Height of Fall: The rammer is designed to fall from a height of 900 mm.

These specifications are crucial for applying a consistent driving force to the core cutter, ensuring it penetrates the soil effectively and obtains an undisturbed sample (relative to the test method).

Analyzing the Given Options

Let's compare the provided options with the Indian Standard specifications:

• Option 1: 2.5 kg, 310 mm
• Option 2: 9 kg, 900 mm
• Option 3: 7.5 kg, 510 mm
• Option 4: 4.89 kg, 450 mm

Comparing these with the standard requirements of a 9 kg rammer mass and 900 mm drop height, we find that Option 2 matches the specifications precisely.

Conclusion

As per Indian Standards, the height of fall for the rammer used in the core cutter test is 900 mm, and its mass is 9 kg. This corresponds to Option 2.