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Operating Procedures

1. When cutting samples with a ring cutter, apply a layer of petroleum jelly to the inner wall of the cutter before extracting the soil.
2. After collecting the soil sample, first remove the top 10 cm or so of soil from the measurement point before leveling the surface.
3. Place the ring cutter with its blade facing downward onto the soil layer, then press the ring cutter vertically.
Then, use a soil-cutting knife to carefully trim the soil sample along the outer edge of the ring cutter, ensuring the sample protrudes slightly above the rim.
Trim the soil samples at both ends of the ring cutter.
4. Wipe clean the soil adhering to the outer wall of the ring cutter, weigh the total mass of the ring cutter and the soil sample to an accuracy of 0.1 g, and record the weight of the ring cutter.
Number the samples and calculate their wet density.
V. Take representative soil samples from within the ring cutter—typically 15g to 30g for cohesive soils, and 50g for sandy soils.
Place the soil sample into the aluminum box, cover it with the lid, and weigh it. Record the aluminum pan's number and the total weight.

6. Open the aluminum box and place it in the oven, heating at a constant temperature of 105°C–110°C until a constant weight is achieved (typically, clay samples require at least 8 hours of drying, while sandy soils need no less than 6 hours).
7. Remove the aluminum box from the oven, cover it with its lid, and place it in a desiccator to cool down to room temperature. Then, weigh the aluminum box along with…
Dry soil mass, accurate to 0.01 g.
8. The water content of the soil is calculated using the following formula, accurate to 0.1%.
W = (m0 / md - 1) × 100
m0 - Wet Soil Mass (g)
md-Thousandsoil Quality (g)

9. Conduct two parallel density tests using the ring knife method (three determinations are required for road engineering projects). The difference between the two test results must not exceed 0.03 g/cm³.

10. The records of the ring knife method density test should include the project name, test point location, sample moisture content, sample weight, and sample volume.

Company Profile

Hebei Yinfeng Experimental Instrument Co., Ltd. is a high-tech enterprise dedicated to the research and development, production, and sales of experimental instruments. The company is headquartered in Hebei Province, relying on the strong industrial foundation and technological innovation resources in the Beijing Tianjin Hebei region. It is committed to providing high-precision and high reliability testing equipment and solutions for material testing, engineering quality control, scientific research experiments and other fields.

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We provide customers with full-process services ranging from pre-sale consultation, customized solution design, equipment installation and commissioning to after-sale technical support.

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The records for the ring knife method density test should include the project name, measurement point location, sample moisture content, sample weight, and sample volume.

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info@cnhblabequipment.com

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