How to solve problems in asphalt concrete pavement during construction

With the rapid expansion of expressway networks today, asphalt concrete pavement has become increasingly popular and has spurred the development of comprehensive equipment and technologies, focusing on pavement structure, raw materials, construction methods, and inspection. Significant advancements have been made in construction techniques, with some asphalt concrete pavements reaching or nearly matching international standards. However, the quality of these pavements is influenced by numerous factors including operator skill, raw materials, machinery, technical processes, environmental conditions, and the complexity of construction workflows. Therefore, establishing a robust supervisory system is crucial. As supervisors, construction companies must adhere strictly to approved plans and standards. Every step in pavement construction directly impacts the overall quality. Hence, meticulous oversight of each process is essential to ensure high-quality asphalt concrete pavements. 1. Mixing Asphalt Mixture During the mixing process, asphalt concrete can experience inconsistent quality or uncertainty, especially with green mixing materials. Ensuring consistent quality at standardized, mechanized construction sites is challenging. For instance, temperature imbalances or inconsistencies in raw materials can alter the flow value and porosity, affecting pavement durability. Daily extraction and screening tests are conducted to analyze data, guiding production adjustments. These include modifying the proportion of cold feed hoppers and regulating the specifications of oscillating screens in the mixing plant. Circular hole screens have proven effective when operated according to the following specifications: 1# sieve > (1?2) mm 2# sieve = ((larger than 5mm) + (1?2)mm)/2 3# sieve = 5 mm (1?2) mm 4# sieve = 3 mm This approach allows for flexible adjustments. Using round hole screens sized 33, 16, 6, and 3 has yielded positive results. Professional engineers continuously monitor the mixing process to ensure quality and address issues immediately. 2. Rolling Processing Technology Compaction is a critical phase in forming asphalt surfaces, ensuring physical and mechanical properties align with design standards. Supervision at all levels is vital, with immediate corrections for deviations. Key considerations include: 1. Edge gaps often occur after rolling, significantly impacting pavement reliability. Monitoring initial and final rolling temperatures ensures compliance with design specifications. 2. Oscillating rollers should avoid abrupt starts or stops on fresh asphalt layers, requiring experienced operators. 3. Excessive watering accelerates cooling, causing cracks. Watering on the roller's tires should be minimal to prevent damage to the rolling process. 4. Tire pressure and condition must be uniform before using the tire method to avoid uneven surface planes. 3. Penetration Surface Layer Construction Following a structured procedure ensures quality: 1. Develop a construction plan and curb installation. 2. Prepare the subbase. 3. Apply a permeable oil or tack coat before spraying. 4. Lay the primary layer of gravel, ensuring particle size consistency and avoiding vehicle traffic. 5. Compact the gravel layer using a 6-8 ton oscillating roller at 2 km/h, adjusting from the edges to the center. Roll twice to stabilize the layer, followed by a 10-12 ton roller for four to six passes until the layer is tightly bound. 4. Asphalt Concrete Mixing Rules 1. Precisely control mineral and asphalt usage as per the mix design. 2. Monitor heating temperatures for raw materials and asphalt. 3. Ensure uniformity in the mixed material, free of spots or segregation. 4. Sample each batch for testing. 5. Clean mixing equipment and document checks thoroughly. 5. Sampling and Testing Site tests must align with rules to ensure accuracy. Samples are taken from the mixer and paving site, with density tests conducted on compacted samples. Immediate action is taken if discrepancies arise. Parallel tests are conducted for verification. 6. Paving Quality Paving affects overall pavement quality. Challenges include uneven thickness, temperature variations, and movement rates. Solutions involve monitoring elevation, adjusting screed temperatures, and maintaining consistent paving speeds. 7. Joint Inspection Addressing joints is vital for smooth transitions. Proper cutting, filling, and rolling techniques ensure durability and flatness. By addressing these aspects comprehensively, we can achieve superior asphalt concrete pavements.

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