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I. The Rock Disintegration Resistance Tester is a specialized instrument primarily used to determine the durability disintegration index of rocks. It can assess how well a rock resists disintegration after undergoing repeated cycles of wetting and drying due to environmental factors like climate changes. The equipment features two drum-shaped sample chambers that are rotated at 20 revolutions per minute by a motor fixed to the device’s baseplate. These drum-shaped chambers are mounted on lubricated bearings, allowing them to rotate smoothly without any resistance. Made from corrosion-resistant materials, the drum-shaped sample chambers come equipped with two water tanks. This versatile device is widely suitable for use in universities, research institutes, testing centers, and other institutions to evaluate the durability of clayey rocks and weathered rock samples.

II. Compliance Standards:

"DZ/T0276.2-2015, National Geological and Mineral Industry Standard of the People's Republic of China: Code for Physical and Mechanical Property Tests of Rocks – Part 9: Rock Disintegration Resistance Test."

JTG E41-2005, the "Code for Rock Testing of Highway Engineering," stipulates.

III. Main Parameters of the Rock Disintegration Tester

1. Host power: 50W

2. Rotational speed: 20 RPM

3. Sieve Cylinder: φ140 × 100 mm,

4. Standard sieve aperture: 2 mm

5. Sink volume: 200 x 170 x 120 mm

6. Specimen specifications: Each piece weighs 40–60 g, totaling 10 pieces, and should be ground into a smooth, rounded shape using a grinding wheel or sandcloth.

7. Specimen shape: Roughly spherical, with no sharp edges

8. External dimensions: 900 x 300 x 500 mm

9. Power supply voltage: 220V

IV. Steps for the Rock Disintegration Resistance Tester

1. Select the specimen carefully, verify its name and number, and record them in the designated table.

2. Place the specimen into the cylindrical sieve cylinder of the disintegration tester, dry it at a temperature of 105–110°C until constant weight is achieved, then cool it to room temperature in a desiccator before weighing.

3. Place the cylindrical sieve cylinder containing the specimen into the water tank, then slowly pour pure water into the tank until the water level is approximately 20 mm below the rotating shaft. After rotating the cylindrical sieve cylinder at 20 r/min for 10 minutes, transfer the cylinder along with the remaining specimen to an oven and dry it at a temperature of 105–110°C until constant weight is achieved. Finally, allow the sample to cool to room temperature in a desiccator before weighing.

4. Repeat the procedure outlined in item 3 of this section to determine the mass of the cylindrical sieve cylinder and the remaining test specimen after the second cycle.

Up to 5 or even more cyclic tests can be conducted as needed.

5. During the experiment, the water temperature should be maintained within the range of 20±2℃.

6. After the test is completed, describe the remaining specimens, the color of the water, and any sediment found in the water. If necessary, perform particle analysis, determine the liquid limit and plastic limit of the sediment, and conduct clay mineral analysis.

7. Weigh accurately to 0.01 g.

V. Calculation of Rock Disintegration Test Results

Calculate the rock disintegration index using the following formula:

Id2 = mr / md %

In the formula: Id2 – Rock (secondary cycle) Disintegration Resistance Index (%);

md—original sample drying mass (g);

Mr.—Residual sample drying mass (g)

NBJ-II Model

Rock Disintegration Resistance Tester

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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Rock Disintegration Resistance Tester

I. The Rock Disintegration Resistance Tester is primarily used as a testing instrument to determine the durability disintegration index of rocks. It assesses how well rocks withstand repeated wetting and drying cycles caused by climatic factors, evaluating their long-term resistance to disintegration. The equipment features a motor fixed to the baseplate, which rotates two drum-shaped sample containers at 20 revolutions per minute. These drum-shaped containers are mounted on lubricated bearings, ensuring smooth rotation without any friction. Made from corrosion-resistant materials, each drum is equipped with two water tanks. This device is widely suitable for use in universities, research institutes, testing centers, and other institutions for determining the properties of clayey rocks and weathered rock samples. II. Compliance Standards: - "DZ/T0276.2-2015, Geological and Mineral Industry Standard of the People's Republic of China: Test Procedures for Physical and Mechanical Properties of Rocks—Part 9: Rock Disintegration Resistance Test." - JTG E41-2005, "Test Procedures for Rocks Used in Highway Engineering." III. Main Technical Specifications of the Rock Disintegration Resistance Tester: 1. Host Power: 50W 2. Rotation Speed: 20 rpm 3. Sieve Cylinder: φ140 × 100 mm 4. Standard Sieve Aperture: 2 mm 5. Water Tank Volume: 200 × 170 × 120 mm 6. Sample Specifications: Each sample weighs between 40–60 g, with a total of 10 samples. They should be ground into smooth, rounded shapes using a grinding disc or sandpaper. 7. Specimen Shape: Approximately spherical, free of sharp edges. 8. Overall Dimensions: 900 × 300 × 500 mm 9. Power Supply Voltage: 220V IV. Rock Disintegration Resistance Test Procedure: 1. Select appropriate test specimens, verify their names and identification numbers, and record this information in the designated log sheet. 2. Place the specimens into the cylindrical sieve cylinder of the tester, then dry them at a temperature of 105–110°C until they reach a constant weight. Allow the dried samples to cool to room temperature in a desiccator before weighing. 3. Position the sieve cylinder containing the specimens inside the water tank, add pure water to ensure the water level remains approximately 20 mm below the rotating shaft. Rotate the cylinder at 20 rpm for 10 minutes, after which remove it and dry both the cylinder and remaining specimens at 105–110°C until they reach a constant weight. Cool the dried samples to room temperature in a desiccator before reweighing. 4. Repeat Step 3 to determine the mass of the sieve cylinder and residual specimens after the second cycle. Additional cycles can be conducted up to five times or more, depending on experimental requirements. 5. During the test, maintain the water temperature within the range of 20 ± 2°C. 6. After completing the test, carefully describe the appearance of the remaining specimens, the color of the water, and any sediment present in the water. If necessary, perform particle size analysis, limit water content determination, and clay mineral analysis on the water sediment. 7. Weigh all samples with an accuracy of 0.01 g. V. Calculation of Rock Disintegration Resistance Index: The rock disintegration resistance index (Id2) is calculated using the following formula: \[ \text{Id2} = \frac{\text{mr}}{\text{md}} \% \] Where: - Id2 = Rock disintegration resistance index (after the second cycle), expressed as a percentage (%) - md = Original sample weight after drying (in grams) - mr = Residual sample weight after drying (in grams)

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