Improving the quality of asphalt mixtures produced by mobile asphalt plants is a systematic project requiring meticulous control from multiple dimensions, including raw materials, production processes, equipment control, and quality management. The following are specific measures and suggestions:
I. Strictly Control Raw Material Quality
Asphalt: Select branded asphalt with stable performance, ensuring that its penetration, ductility, softening point, and other indicators meet specifications.
Avoid high-temperature aging during storage, ensuring stable asphalt tank temperature (usually ≤170℃) and preventing moisture ingress.
Aggregates (Stone):
Stable Source: Maintain a consistent source of materials to minimize lithological variations.
Uniform Size: Strictly control the particle size, particle shape (cubic is preferred), and cleanliness (mud content ≤1%) of each grade of aggregate.
Strengthened Testing: Test the moisture content and gradation of aggregates daily and adjust the mix proportions promptly.
Mineral Fillers (Mineral Powder)
Use finely ground limestone to increase asphalt adsorption.
Strictly control moisture content to prevent clumping.

II. Optimized Mix Design
Target Mix Design: Design a reasonable gradation curve (e.g., AC, SMA) based on project requirements and climatic conditions to avoid gradation fluctuations.
Determine the optimal asphalt content through Marshall testing, balancing high-temperature stability and low-temperature crack resistance.
Production Mix Calculation: After installation at the mobile station, conduct multiple trial mixes to adjust the cold aggregate bin feed ratio and ensure stable gradation in the hot aggregate bins.
Use the combustion method to quickly test asphalt content and gradation, providing timely feedback and adjustments.
III. Precise Control of the Production Process
Temperature Control:
Asphalt Heating: Temperature controlled at 150-170℃ (adjusted according to asphalt type).
Aggregate Heating: Ensure the discharge temperature meets specifications based on weather and transportation distance (typically 145-165℃ for ordinary asphalt mixtures and 160-175℃ for modified asphalt mixtures).
Avoid Overheating: Prevent high-temperature burning of aggregates or asphalt aging.
Metering Accuracy: Regularly calibrate asphalt scales, aggregate scales, and mineral powder scales to ensure metering errors ≤ ±0.5%.
Check sensor sensitivity to prevent material adhesion from affecting accuracy.
Mixing Uniformity:
Mixing Time: Dry mixing time should be ≥5 seconds, wet mixing time should be ≥35 seconds (adjust according to equipment performance) to ensure asphalt completely coats the aggregate.
Agitator Paddle Condition: Regularly check the wear of the agitator blades and replace them promptly to prevent uneven mixing.
Preventing Segregation: When unloading from the storage silo to the transport vehicle, move the unloading point back and forth multiple times to reduce pile height.
Cover the transport vehicle with a tarpaulin as soon as possible after loading to reduce temperature loss and particle segregation.
IV. Equipment Maintenance and Calibration
Regular Maintenance: Daily inspection of key components such as burners, dust removal systems, and vibrating screens.
Clean screens to prevent clogging that could affect gradation.
Temperature Sensor Calibration: Regularly calibrate using an infrared thermometer to ensure accurate temperature measurement.
Belt Scale and Flow Meter: Calibrate weekly using standard weights to ensure accurate feed ratio.
V. Strengthen Quality Inspection and Feedback
Process Monitoring: Check the discharge temperature of each truckload and visually inspect the color and uniformity of the mixture.
Sampling is conducted every 200-300 tons to test asphalt content, gradation, Marshall stability, etc.
Rapid Feedback and Adjustment: If deviations in indicators are found (such as fluctuations in the asphalt-aggregate ratio), immediately stop the machine and check the metering system or raw materials.
Use an infrared thermal imager for asphalt mixtures to monitor temperature uniformity and adjust the combustion system promptly.
Data Recording and Analysis: Establish a production log to record data for each batch (temperature, mix proportion, weather, etc.) for traceability and improvement.
VI. Personnel Training and Management
Operator Training: Train operators to be familiar with equipment characteristics, process flow, and handling common problems.
Emphasize the importance of the three core elements: temperature, time, and metering.
Establish a Quality Reward and Penalty System: Link the mixture pass rate to performance to enhance accountability.
VII. Environmental Adaptability Adjustment
Rainy Day Production: Increase aggregate drying time to ensure moisture content ≤0.5%.
Low-Temperature Construction: Appropriately increase the discharge 
temperature (within the allowable range), shorten transportation time, and strengthen insulation measures.
Summary: Key Control Points
Stable material source, strict control of raw material quality.
Precise metering to ensure accurate mix proportions.
Temperature control to prevent overheating or underheating.
Uniform mixing to avoid segregation and aging.
Continuous monitoring to achieve data-driven closed-loop management.
Through the above measures, mobile asphalt plants can produce high-quality mixtures comparable to those from stationary asphalt plants, meeting the requirements of high-grade road construction.