The instrument has been developed in accordance with the requirements specified in T0709-2011, “Marshall Stability Test for Asphalt Mixtures,” as outlined in the industry standard JTG E20-2011, “Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering” issued by the People’s Republic of China. It is suitable for conducting the Marshall stability test on asphalt mixtures and can accurately determine the failure point of asphalt mixtures, thereby facilitating the design of asphalt mixture proportions or the quality inspection of asphalt pavement construction.

I. Key Technical Features

1. The instrument employs advanced instrumentation control and microcomputer processing technologies. The entire test is automatically performed by the instrument itself. This instrument boasts advantages such as cutting-edge technology, a high degree of automation, and the absence of human-induced testing errors.

2. The instrument features a high-resolution color touch screen that directly displays the stress-strain curve during the test [When the pressure or displacement exceeds the display range, the instrument automatically adjusts the coordinate data], as well as test data for stability and flow value. It also automatically calculates and displays the Marshall modulus, prints out the test results, and provides intuitive test outcomes. Equipped with an 8-inch large-screen color LCD touch screen and convenient shortcut keys, the instrument is extremely easy to operate.

3、 Smart features: The instrument features automatic specimen grouping, automatically classifying specimens that exceed the specified requirements according to procedural standards. The test results for the “K” value are automatically excluded, while the average of the qualified test results is calculated and displayed—truly enabling immediate generation of final results at the time of testing, making it extremely user-friendly.

4. This instrument features functions such as parameter setting, metrological calibration, automatic test control, automatic data acquisition, and a real-time clock. The control unit simultaneously collects test data on the specimen’s stability and flow value, and automatically identifies the peak value.

5. The entire test is completed automatically, with test graphs and results automatically printed.

6. This instrument features manual control for raising, lowering, and stopping, as well as upper and lower limit protection functions, making it extremely easy to use.

II. Main Technical Parameters and Specifications

1. Maximum load: 50 kN.

2. Measurement range: 50 kN.

3. Measurement error: ≤ ±0.05 kN.

4. Overload protection function: Automatically activates when the load exceeds 50 kN.

5. Vertical deformation (flow value): Measurement range: (0–20) mm. Measurement error ≤ ±0.05 mm.

6. Press rising speed: (50 ± 5) mm/min.

7. Equipped with 101.6 mm and 152.4 mm test fixtures;

8. Can do Freeze-thaw splitting test; testing fixtures provided separately.

9. Equipped with a computer interface for convenient computer communication;

10. Equipped with a printer for printing test graphs and data;

11. Operating voltage:   AC (220 ±10%) V, 50 Hz.

12. Ambient temperature:   0℃ to 60℃.

13. External dimensions:    600mm × 380mm × 900mm (length × width × height).

14. Motor power:   550W.

15. Weight (net weight): 98 kg.