Asphalt pavement performance includes two major categories of functional core structural performance. Among them, the pavement functional performance is reduced, and targeted methods can be simply adopted, such as asphalt overlay, micro-surface, fogging, or resurfacing after milling. solve. If the base layer is completely damaged or even the subgrade is destroyed, most of the base and subbase materials will be lost and structural damage will occur. The solution is to rebuild the subgrade and the base layer. However, if the grassroots is only partially damaged, most of the grassroots and substratum materials remain intact, and rebuilding the grassroots is not a wise choice in terms of economy and time. The deep cold regeneration process of the CAT RM series pavement Road cold recycler machine to be introduced by the Road cold recycler machine experts is an effective and economical solution for this kind of road grassroots damage.
The deep cold recycled asphalt pavement repair process first uses the CAT RM series of pavement Cold recycler. After the original damaged old asphalt pavement and some of the base course materials are continuously milled, loosened and crushed in situ, the design requirements are selectively Add proper amount of aggregate, and add a certain proportion of stabilizers (such as cement, lime, fly ash, emulsified asphalt, foamed asphalt, etc.) and water, mix them in situ at natural normal temperature, and then reshape and roll. Form a new and improved special graded road base. The road base course treated by this regeneration process has much higher structural strength than the original road base course. After the cold-recycled road basement is cured, it can be sealed or asphalted. The specific construction process is as follows:
Milling, loosening, and crushing The three processes of milling, loosening, and crushing are continuously completed in a single operation using the RM series Road cold recycler machine. The depth of regeneration must be determined by the design department. The original pavement must be thoroughly investigated to understand the damage of the subgrade pavement, the thickness of each structural layer, the depth of damage below the surface layer, and the water content below the base layer, and make relevant records. Coring, digging, and deflection testing must be performed when necessary to determine the depth to be regenerated. Conditions can be used for test sections to determine the best construction technology and methods to ensure the quality of Road cold recycler.
In the cold regeneration process, if precise control of the regeneration depth is required, the CAT RM series cold regeneration machine can purchase the CAT automatic depth control device to maintain accurate working depth.
Chuping Chuping uses a grader to perform two functions: it provides a good working surface for the subsequent distribution of aggregates and powdery stabilizers and removes particles with large particle sizes.
Adding Aggregate, Stabilizer, and Water The amount of aggregate, stabilizer, and water is determined by the mix design test. The elevation, structural strength, and health time of the pavement after regeneration must be fully considered. If the elevation requirements are strict and the adjustment of the mix of new aggregates and stabilizers can no longer meet the requirements of elevation control, you can consider milling a part of the old asphalt surface layer with a milling machine before regeneration, and then perform the regeneration operation. . Aggregates and powdery stabilizers are spread on the working surface after the initial level by a special spreading truck. Conditions are not allowed. Manual spreading can also be used, but the uniformity of spreading must be controlled as much as possible. The liquid stabilizer and water can be contained in a special tank truck, connected to the water pump of the regenerator through a special pipeline, and continuously added in proportion during the mixing process.
Mixing and mixing is completed by the CAT RM series cold recycler. The mixing depth must exceed the thickness of the mixture, and it is advisable to invade the un-loosed base layer 1 ~ 2cm. Adequate mixing of additives to improve regeneration quality. During the mixing process, a special person should be sent to check the mixing depth and water content at any time. It should be checked at any time and adjusted according to the site conditions to facilitate construction and approach the optimal water content and ensure the regeneration quality.
Initial pressure Initial pressure can be carried out by single steel drum vibratory rollers and bump-type vibratory rollers. The role of initial pressure is to initially stabilize the recycled material, avoiding excessive movement in the subsequent shaping work, causing segregation and affecting quality.
Reshaping Reshaping is performed using a grader, and construction must be carried out in accordance with the relevant requirements of the Technical Specifications for Highway Pavement Base Construction.
Rolling and compacting the regenerated base material is best carried out with a high-power single-steel wheel roller. Rolling procedures and methods are carried out in accordance with the relevant requirements of the Technical Specifications for Construction of Highway Pavement Base Courses or the methods of test section confirmation.
Health time The health time can be determined through laboratory tests. In general, the factors that affect health time are the gradation of the material, the type of stabilizer used, the moisture content of the recycled material, and the temperature of the environment.
Health maintenance shall be carried out in accordance with the relevant requirements of the Technical Specifications for Construction of Highway Pavement Bases. During the health period, traffic control must be strictly in accordance with requirements.
Sealing layer or asphalt covering After regeneration, the road base course can be directly opened to traffic, but for higher-grade roads, it is recommended to add a sealing layer or hot-mixed asphalt concrete covering. The water stability of the regenerated road base material is relatively poor. Adding a sealing layer and a hot-mixed asphalt concrete cover can reduce the direct erosion of road surface water to the regenerated road base material and prolong the service life of the road.
When the asphalt pavement is partially damaged, compared with the traditional asphalt pavement maintenance process, the deep Road cold recycler process has the advantages of simple procedures, low construction costs, high production efficiency, resource conservation, environmental protection, non-interrupted traffic and so on. Increase the structural strength of the road base.
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