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Paving construction of cast-in-place asphalt mixtures
The paving construction method for cast-in-place asphalt mixtures encompasses comprehensive process control, including the production, transportation, spreading, and stone chip application of cast-in-place asphalt mixtures. The term "cast-in-place asphalt concrete" literally means "flowing pavement," reflecting its fluid nature: when laid, this type of asphalt concrete does not require compaction—simply spreading and leveling it is sufficient to complete the construction. Cast-in-place asphalt concrete belongs to the category of dense-graded asphalt concretes. Its mixture features a high content of fine aggregates, a high proportion of mineral powder, and a relatively high asphalt content. The increased asphalt content keeps the aggregate particles in a suspended state. Unlike hot-mix asphalt concrete, cast-in-place asphalt concrete has a very low void ratio and its internal voids are not interconnected.
2013-01-16
Performance of Cast-in-Place Asphalt Mixtures
Product Performance of the Pouring-Type Asphalt Mixture Flexural Creep Testing Machine: 1. The LCD screen displays the relationship curve between displacement and time. 2. It automatically analyzes and determines the test results. 3. It automatically controls the entire testing process. 4. Equipped with a computer interface, allowing curves and results to be printed via computer. 5. The LCD screen displays the relationship curve between displacement and time and automatically analyzes and determines the test results. 6. Equipped with a computer interface, allowing curves and results to be printed via computer. 7. It automatically controls the entire testing process. 8. It features a water circulation system to ensure uniform temperature distribution.
2013-01-09
Poured asphalt mixtures are applied using machinery.
Poured asphalt mixtures are applied using mechanical equipment: 1. Pressure-type crack-sealing machines: These machines perform crack-sealing manually. Although they can prevent rainwater from penetrating the pavement base and slow down further crack propagation, they offer excellent sealing performance, extend the service life of the pavement, and enhance both the safety and comfort of vehicles traveling on it. 2. Jet-type pothole repair machines: Jet-type asphalt pavement repair technology is a highly efficient and rapid method for maintaining and repairing potholes in road surfaces. The primary principle behind this technique involves using high-pressure jetting to mix heated emulsified asphalt with aggregate materials conveyed via spray nozzles and conveyor belts. The mixture is then uniformly sprayed onto the pavement surface by means of high-speed compressed air.
2013-01-04
Products of the rotary compactor
Currently, the most advanced and user-friendly rotary compactor on the market is the Troxler 5850 model—the latest product from Troxler. Once installed, the rotary compactor is ready for immediate use without the need for calibration. This model can compact asphalt specimens to a specified height or for a predetermined number of rotations, and each rotation’s angle is precisely recorded to ensure accuracy. The rotation angle can be easily adjusted using buttons. The model can store up to 20 sets of test data and features a large, backlit display screen that allows for easy printing or output of test results. It boasts the most user-friendly interface, the highest level of intelligence, and the simplest operation currently available on the market.
2012-12-26
Causes of Cracking in Cast-in-Place Asphalt Mixtures
Cracking in cast-asphalt mixtures occurs when repeated loading-induced fatigue stresses within the pavement materials exceed the tensile strength of the pavement mixture. On roads, vehicles—primarily automobiles—are the primary users of the pavement and also the main factors causing damage to the pavement structure and destabilizing the subgrade. With the development of traditional fatigue failure theories, it has become clear that pavement deterioration is significantly influenced by traffic load factors—including increasing traffic volumes, higher axle loads, rising vehicle speeds on highways, the vibrational characteristics of traffic loads, and the appropriateness of traffic parameter determination. The impact of these traffic load factors on the early-stage distress of asphalt concrete pavements cannot be overlooked.
2012-12-19