Laboratory Double Barrels Theoretical Maximum Specific Gravity Density Tester for Asphalt Mixture

This instrument complies with the industry standard of the Ministry of Transport "Highway Asphalt and Asphalt Mixture Test Procedure, Asphalt Mixture Theoretical. Large Relative Density Test (Vacuum Method)". The vacuum method is used to determine the theoretical. Large relative density of asphalt mixture at 25°C.
The determination of the theoretical maximum relative density of asphalt mixture can provide basic data for calculating void ratio, compaction degree, etc. in asphalt mixture mix design, road condition investigation or pavement construction quality management. Therefore, the accuracy of the theoretical. Large relative density test value of asphalt mixture directly affects the pavement construction quality management and control.
The maximum relative density of asphalt mixture refers to the ratio of the mass of the test piece per unit volume to the mass of water at the same temperature when the asphalt mixture is compacted to an ideal state without voids.
This instrument consists of a frame, a vacuum pump, a vibrator, a vacuum regulating valve, a vacuum gauge, a pressure gauge, a water accumulation device, a vacuum container and control electrical appliances. It has a reasonable structure and is easy to use. It can perform parallel tests on two samples at the same time.

Air extraction system: generally composed of a vacuum pump, etc., used to extract air from the negative pressure container to achieve the specified vacuum degree in the container.

Vibration system: composed of a vibration motor and a vibration table, etc., which vibrates the mixture in the negative pressure container during the vacuuming process to make the bubbles in the mixture easier to discharge.

Negative pressure container: used to hold asphalt mixture samples and water, usually of different types such as A, B, C, etc., with a volume of generally 4000ml or 4300ml, and the material is mostly stainless steel or plexiglass.

Control system: It can realize automatic control of the processes such as vacuuming and vibration, including single-chip microcomputer, display screen, operation buttons, etc., and can set and display parameters such as vacuum degree, vibration time, vibration frequency, etc.

Measurement system: It includes vacuum gauge, pressure sensor, etc., which are used to monitor the vacuum degree or pressure change in the negative pressure container, and balance for weighing mass, etc.

Maintenance: Regularly check the amount of lubricating oil in the vacuum pump, add oil or change oil in time; keep the negative pressure container, vibration table and other parts clean to prevent debris from entering; after the test, clean the instrument in time and turn off the power.

1. Oscillation mode: continuous/interval
2. Amplitude: 0.2mm
3. Vacuum negative pressure range: -0.1MPa~1 standard atmosphere; can be adjusted arbitrarily
4. Negative pressure in negative pressure container 3.7kPa±0.3 kPa (27.5mmHg±2.5 mmHg), digital display (real-time display)
5. Pumping power: 120W
6. Time can be set
7. Vacuum barrel: 2 pieces of plexiglass; container volume 4300ml×2 pieces; diameter 190mm×depth 170mm
8. Power supply voltage: 220V±10%
9. Dimensions: 500×500×500mm