Bitumen Pav Asphalt Pressure Aging Vessel Test Degassing Equipment Oven
Applicable Standards
This method is applicable to residues from petroleum asphalt, polymer-modified asphalt, or diluted asphalt and emulsified asphalt.
This Vacuum Degassing Oven equipment consists of the PAV-1-1 Asphalt Pressure Aging Chamber and the PAV-1-2 Asphalt Aging Vacuum Chamber. The vacuum chamber is used to remove bubbles from asphalt before casting, using negative pressure at a specific temperature to squeeze out the bubbles.
Technical Parameters
1. Working Volume: 13L
2. Working Temperature Range: (90-110)°C
3. Temperature Control Accuracy: ±0.5°C
Working Pressure: 2.1MPa ±0.1MPa
4. Design Pressure: 2.2MPa
5. Hydrostatic Test Pressure: 2.75MPa
6. Safety Valve Opening Pressure: 2.35 MPa
7. Bursting Pressure of Safety Bursting Disc: 2.6 MPa
Features and Advantages
1) The manufacture, installation, and use of this equipment comply with the relevant provisions of the "Regulations on Safety Supervision of Special Equipment," ensuring the safety of its products.
2) Equipped with a computer, the pressure aging test is controlled and monitored by the computer, and the entire test process is completed automatically under computer control.
3) Real-time monitoring of chamber pressure and temperature, displaying temperature-time and pressure-time curves during operation.
4) Real-time display of temperature error time and pressure error time during the aging process (meets the requirements of the new standard).
5) Due to its computer-controlled system, all test data can be saved, exported, uploaded, or connected to an external printer.
6) Safety features such as over-temperature and over-pressure protection, and a safety bursting disc device effectively protect experimental personnel during high-temperature and high-pressure experimental conditions.
7) Both the asphalt pressure aging chamber and the asphalt aging vacuum chamber are made of durable stainless steel. They fit on any standard laboratory bench and are easy to operate and maintain.
Frequently Asked Questions (FAQ)
Q1: What international standards do the Pressure Aging Vessel (PAV) and Vacuum Degassing Oven (VDO) strictly comply with?
A: Both systems are engineered to fully satisfy global binder aging and testing standards:
PAV Standards: AASHTO R 28, ASTM D6521, and EN 14769 (standard practice for accelerated aging of asphalt binder using pressurized air).
VDO Standards: AASHTO R 28, ASTM D6521, and EN 14769 (vacuum degassing of aged asphalt binder prior to Rheometer/DSR/BBR physical testing).
Q2: How does the Pressure Aging Vessel (PAV) ensure high-pressure safety during long aging cycles?
A: Safety is our top engineering priority during high-pressure 2.1MPa) and high-temperature （90 - 110℃) 20-hour aging runs:
Certified Pressure Vessel: Precision-machined, high-strength ASME/CE certified stainless steel pressure vessel.
Triple Safety Redundancy: Equipped with an electronic over-pressure auto-shutoff limit, a mechanical burst safety disk, and an over-temperature cut-off switch.
Automatic Air Release: Automatically releases internal vessel pressure safely at the end of the test cycle or in case of power interruption.
Q3: What is the capacity of the PAV rack, and how many sample pans can be tested simultaneously?
A:Standard Capacity: The internal stainless steel specimen rack holds up to 10 TFOT/RTFO standard TFOT-style sample pans in a single batch, maximizing laboratory testing throughput.
Uniform Thermal Distribution: Internal heating jacket design guarantees temperature uniformity within ±0.5℃ across all 10 sample positions.
Q4: Why is the Vacuum Degassing Oven (VDO) essential, and how does it automate the degassing process?
A:Purpose: After 20 hours of high-pressure air aging in the PAV, entrapped air bubbles remain inside the bitumen. The VDO removes these air pockets under vacuum 15 kPa（ absolute pressure） at 170℃ to ensure accurate downstream Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) measurements.
Automated Cycle: Features a one-touch automated cycle. The system controls the pre-heating, vacuum evacuation 15 kPa, 30-minute degassing timer, and automatic pressure relief without requiring manual operator intervention.
Q5: What type of compressed air supply or gas bottle is required to run the PAV?
A:Gas Requirement: Standard clean, dry bottled compressed air or a high-pressure air compressor system capable of maintaining 2.1MPa ±0.05MP (305 psi) continuously.
Inlet Filtration: The equipment features built-in high-pressure inlet air filters to protect internal solenoid valves from moisture, oil, and dust contaminants.
Q6: How accurate are the temperature and pressure control systems?
A:Temperature Accuracy: Microprocessor-controlled PID heating system with calibrated RTD (Pt100) sensors provides temperature control accuracy of ±0.1℃ and uniformity better than ±0.5℃.
Pressure Transducer Precision: High-precision digital pressure transducer with an accuracy within ±0.1\%, continuously logged and displayed on the digital touchscreen interface.
Q7: How is test data logged, and can reports be exported for laboratory audits?
A:Real-time Graphics: The built-in color touchscreen continuously records and displays live Temperature vs. Time and Pressure vs. Time curves.
Data Export: Complete test logs (including timestamps, peak pressure, and thermal stability) can be exported via USB port or Ethernet connection in CSV or PDF formats for easy inclusion into LIMS or QA/QC audit files.
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