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One, The Rock Disintegration Resistance Tester is primarily an experimental instrument used to determine the durability disintegration index of rocks. It can assess the rock’s ability to resist disintegration after repeated cycles of drying and wetting caused by climatic factors. The device operates by using a motor fixed to the base plate, which rotates two drum-shaped specimen containers at a speed of 20 revolutions per minute. The drum-shaped specimen containers are mounted on bearings coated with lubricant, ensuring smooth rotation with minimal resistance. These drum-shaped containers are made from corrosion-resistant materials and are equipped with two water tanks. This equipment is widely applicable in universities, research institutes, testing centers, and other institutions for determining the properties of clayey rocks and weathered rocks.

II. Meets the standards:

DZ/T0276.2-2015, National Standard of the People’s Republic of China for the Geological and Mineral Industry—Experimental Procedures for Physical and Mechanical Properties of Rocks, Part 9: Rock Disintegration Resistance Test.

As stipulated in JTG E41-2005, "Code for Rock Testing of Highway Engineering."

III. Main Parameters of the Rock Disintegration Resistance 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*170*120mm

6. Specimen specifications: Each specimen weighs 40–60 g, with a total of 10 specimens. Use a grinding disc or sandcloth to polish them into smooth, rounded shapes.

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

8. External dimensions: 900*300*500mm

9. Power supply voltage: 220V

IV. Procedure for the Rock Disintegration Resistance Tester

1. Select the specimen carefully, verify its name and number, and enter the information into the record form.

2. Place the specimen into the cylindrical sieve cylinder of the disintegration resistance tester. Dry it at a temperature of 105–110℃ until its weight stabilizes, then cool it to room temperature in a desiccator and weigh it.

3. Place the cylindrical sieve cylinder containing the specimen into the water tank, and then add pure water to the tank so that the water level is approximately 20 mm below the rotating shaft. After rotating the cylindrical sieve cylinder at 20 r/min for 10 minutes, dry both the cylindrical sieve cylinder and the remaining specimen at a temperature of 105–110℃ until a constant weight is achieved. Then, cool them to room temperature in a desiccator and weigh them.

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

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

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

6. After the test is completed, describe the residual specimens, the color of the water, and any sediment present in the water. As needed, perform particle size analysis, determination of liquid limit and plastic limit, and clay mineral analysis on the sediment in the water.

7. Weigh accurately to 0.01 g.

V. Calculation of Results from the Rock Disintegration Resistance Test

Calculate the rock disintegration resistance index using the following formula:

Id2 = mr/md %

In the formula: Id2 —— Index of Rock (Secondary Cycle) Disintegration Resistance (%);

md——original sample dried mass (g);

Mr——Dried mass of residual sample (g)

NBJ-II type

Rock Disintegration Test Apparatus

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 Test Apparatus

I. The Rock Disintegration Resistance Tester is primarily an experimental instrument used to determine the durability disintegration index of rocks. It can test the rock’s resistance to disintegration after repeated wetting and drying cycles caused by climatic factors. The device operates by rotating two drum-shaped specimen containers at 20 revolutions per minute, driven by a motor fixed to the baseplate of the equipment. The drum-shaped specimen containers are mounted on lubricated bearings, allowing them to rotate without any frictional resistance. These drum-shaped containers are made from corrosion-resistant materials and come equipped with two water tanks. This equipment is widely applicable in universities, research institutes, testing centers, and other institutions for determining the properties of clayey rocks and weathered rocks. II. Compliance Standards: The equipment complies with “DZ/T0276.2-2015, Geological and Mineral Industry Standard of the People’s Republic of China—Experimental Procedures for Physical and Mechanical Properties of Rocks, Part 9: Rock Disintegration Resistance Test,” as well as the requirements specified in JTG E41-2005, “Test Procedures for Rocks in Highway Engineering.” III. Main Technical Parameters of the Rock Disintegration Resistance Tester: 1. Host Power: 50W 2. Rotational Speed: 20 rpm 3. Sieve Cylinder: φ140 × 100 mm 4. Standard Sieve Aperture: 2 mm 5. Water Tank Volume: 200 × 170 × 120 mm 6. Specimen Specifications: Each specimen weighs between 40 and 60 g; a total of 10 specimens, ground into rounded shapes using grinding discs or sandpaper. 7. Specimen Shape: Roughly spherical, free of sharp edges. 8. Overall Dimensions: 900 × 300 × 500 mm 9. Power Supply Voltage: 220V IV. Procedure for the Rock Disintegration Resistance Test: 1. Select the specimens carefully, verify their names and numbers, and record this information in the designated log sheet. 2. Place the specimens into the cylindrical sieve cylinder of the disintegration resistance tester. Dry them at a temperature of 105–110°C until constant weight is achieved, then cool them in a desiccator to room temperature and weigh them. 3. Place the cylindrical sieve cylinder containing the specimens into the water tank, add pure water to the tank so that the water level is approximately 20 mm below the rotating shaft. Rotate the cylindrical sieve cylinder at 20 rpm for 10 minutes. Then, dry the cylindrical sieve cylinder and the remaining specimens at 105–110°C until constant weight is achieved, cool them in a desiccator to room temperature, and weigh them again. 4. Repeat the procedure described in step 3 to obtain the mass of the cylindrical sieve cylinder and the remaining specimens after the second cycle. If necessary, the test can be repeated up to five times or even more. 5. During the test, the water temperature should be maintained within the range of 20 ± 2°C. 6. After the test, describe the appearance of the remaining specimens, the color of the water, and any sediment present in the water. If required, perform particle size analysis, determination of the liquid limit, and clay mineral analysis on the sediment in the water. 7. Weighing accuracy: 0.01 g. V. Calculation of Rock Disintegration Resistance Test Results: The rock disintegration resistance index is calculated according to the following formula: Id2 = mr / md % where: Id2 — Rock disintegration resistance index (second cycle) (%); md — Original specimen dry weight (g); mr — Remaining specimen dry weight (g). Instruction Manual for NBJ-II Type Rock Disintegration Resistance Tester (Please read the manual carefully before use.)

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