In the near future，Wittgen W 380 CR Cold in-place recycling technology of foamed asphalt based on synchronous paving in Pingchang County, Bazhong City, Sichuan Province SSuccessful application in road rehabilitation project。It is worth mentioning that，This is also the first attempt of this green road regeneration process in the region in 2021.（Click on the link to view the case details）Reapplication after road maintenance。

This also shows that after nearly three years of time test.，Practice has verified the use of the road after regeneration.，Relevant local departments have fully recognized the effect of this green maintenance technology on road repair.。

Wirtgen Based on Synchronous Paving W 380 CR The cold recycling machine has diversified construction capabilities.，It is not only competent for cold regeneration of foamed asphalt、Cement cold regeneration，It is also suitable for cold recycling of emulsified asphalt.，Single unit can operate independently for single-layer cold regeneration in place（This time SThis method is adopted for road 304.），Or cooperate with another milling machine to realize widening type cold regeneration in place，But also can carry out double-layer cold regeneration in place through that echelon cooperation of the unit.（BeforeS204 The road adopts this method.），It provides a variety of feasible schemes for green and low-carbon maintenance of different types of roads.。

This green environmental protection、Energy-saving and efficient new technologies have significant social and economic benefits.，It also provides new ideas and model demonstrations for the green construction of a large number of mountainous and rural roads in the existing traffic network.。

01

Project overview

This time, the cold recycling process of foamed asphalt was adopted to realize upgrading and transformation. SSection from Lingyuan Town to yuanshan Town of Line 304，Total length 15 km，Total road width 6.5-8 m。W 380 CR The unit has realized the cold regeneration of foamed asphalt for the damaged old asphalt surface layer and part of the water stable structure layer.，Total construction area of 100,000 m²。

02

Construction process

At the construction site，By Wittgen W 380 CR Cold recycling machine、Cement spreader、Asphalt tanker、Fogler paver、Hummer, road roller, etc.“Road regeneration train”Take turns on the winding mountain road.。In order to minimize the impact on traffic，The project adopts the method of half opening and half construction.，Proceed 15 cm Thickness foam asphalt cold regeneration。

W 380 CR The milling drum of the cold recycling machine works in an undercutting manner，Will be 15 cm The thick old asphalt surface course and part of the water stable structure layer materials are cut and crushed.，Accurately adding water and foamed asphalt in corresponding proportion，And be mixed simultaneously with the previously spread cement，Nerating new foamed asphalt cold recycling mixture。The regenerated material consists of W 380 CR Into the next Vogler paver hopper。

The foam asphalt cold recycling mixture is mixed again by the paver auger and conveyed to the paver screed for back paving.，Compaction is then carried out by the following Hummer roller.，Form a flat and dense foam asphalt cold regeneration layer。After health preservation，Carry out hot asphalt overlay，Finally, the upgrading of roads will be realized.。

03

Construction advantages

Wittgen W 380 CR The advantages are obvious，Road surface with half width can be regenerated at one times，Extremely efficient construction。6000 per day~8000 m² Workload，Only 14 days of construction time，The construction task is completed.。

W 380 CR Undercut process is adopted during operation.，The grading uniformity of the milling material is improved，Materials within the regeneration width were cross-mixed in the transverse direction，More than 25% in the longitudinal direction by the synchronous paving proces m Dynamic mixing of。

Within this range，The original pavement material is mixed evenly for many times before it is discharged below the screed of the paver.，As a result, the variability and discreteness among the original pavement materials are significantly eliminated.，And is particularly suitable for different section of mountain roads with different maintenance history.，Materials between different sections、Moisture content、There may be a large difference in structural thickness.，Therefore, it is more effective to upgrade the road in terms of strength and road performance.。

Especially in resource-poor areas.，The green construction technology of cold in-place recycling based on synchronous paving can be 100%Use of old materials on site，Reduced mining and use of road-building materials，It is conducive to protecting the ecologically fragile mountain environment.。Meanwhile, compared with the traditional process,，The technology saves energy and reduces emission，And that maintenance cost is save，Help the development of the local highway industry。