In the near future，Wittgen W 380 CR Cold in-place recycling technology of foamed asphalt based on synchronous paving in Liaoning Province GSuccessful application in repair engineering of Dandong Fengcheng Section 304，This is also the first application of the new maintenance technology in Liaoning Province.。This green environmental protection、Energy-saving and efficient new technologies have significant economic and environmental benefits.，It has also attracted the attention of provincial highway authorities and trading groups.。
Project overview and maintenance plan
G304 Danhuo Line is an important passageway between Dandong City and Fengcheng City in Liaoning Province.，Two lanes in both directions with hard shoulder，Original pavement width 11.5 meters。After years of traffic load and UV aging，The pavement condition index decreased to a certain extent.。
The main pavement disease before maintenance is fatigue crack.、Rut、Net crack, etc，Poor flatness，It seriously affects the comfort and safety of driving.，A comprehensive and complete restoration is urgently needed.。In order to better respond to the national call for low-carbon roads and circular economy.，And for new materials.、New Technology、New technology、Popularization and application of new equipment，After research, it is decided to apply the cold in-place recycling technology of low-carbon high-performance foamed asphalt based on synchronous paving to repair some sections of the road.。
This is the first application of this new advanced cold in-place recycling technology in Liaoning Province.，This will provide a good reference for the future national and provincial trunk highway maintenance projects to open up new structural forms and maintenance programs.。
Before the implementation of the scheme，A detailed road condition survey was carried out on the original pavement.，Combined with the original pavement structure and disease condition，Back-calculation result based on traffic volume and deflection，Finally, it was decided to adopt the following scheme to repair the original pavement.：
Before construction，Representative sampling of the existing pavement materials was carried out，And commissioned the relevant units to carry out the indoor mix design.，The design results are as follows。According to the experimental results,，The performance of the mixture fully meets the requirements of the specification.。
Regeneration process and quality control
The construction of cold in-place recycling of foamed asphalt，Wittgen was used W 380 CR The cold in-place recycling technology of foamed asphalt based on synchronous paving is implemented.。At the construction site，Wittgen W 380 CR On-site cold recycling motorcade lined up，Efficient operation。
In order to meet the demand of half opening to traffic and half construction，Requires half-width 5.One regeneration of the mixture within a width of 75 m，Therefore, the construction unit, Liaoning Datong Highway Engineering Co., Ltd., used the Wittgen 2-meter Milling Machine to pre-mill part of the pavement longitudinally in advance.，The milled material is placed directly on the spot at 3 of the Recycling Machine.Within 8m working width，O as to facilitate the reGenerator pair 5.One regeneration of all material within 75 m。
And then，W 380 CR When the old asphalt pavement is milled and crushed,，Accurately add the corresponding proportion of water and foamed asphalt，And mix with the pre-spread cement synchronously.，Nerating new foamed asphalt cold recycling mixture，And transferred to the next Vogler Paver hopper，Directly carry out back paving by Paver，The recycled material is then compacted by a full set of Hummer rollers，The whole process is efficient and smooth.，And that construction quality and efficiency are ensure.。
Technicians use sand filling method to test the compaction degree of the road surface after compaction on site.，The test results meet the construction requirements.。After rolling is completed，Open the traffic immediately after spreading the tack coat oil on the surface of the mixture，The impact on traffic is reduced to a low level，Complete dense core samples were taken out 3 days after the traffic was opened.。
Under construction，Wittgen W 380 CR The advantages are obvious，Road surface capable of regenerating half width at one times，Extremely efficient construction，The construction period is saved by about 50%，Traffic impacts during construction are greatly reduced。At the same time，W 380 CR Undercut process is adopted during operation.，The grading uniformity of the milling material is improved，Material within the regeneration width is cross-mixed in the transverse direction，In the longitudinal direction, there is more than 25 meters of dynamic mixing.，The discreteness of the pavement material is significantly eliminated。
At the same time，This technology also shows many advantages in economy and energy saving and emission reduction.，Compared with the traditional technology，OKCost savings 25%Left and right，RealizedOld material of original asphalt concrete pavement 100%In-situ regeneration and recycling，Greatly reduce the use of new materials and the removal and disposal of road waste.。 Fair to middling Reduce energy consumption 60%Above，Reducing CO2 emissions 80%Above，Realizing green environmental protection, energy conservation and high efficiency，Contribute to the achievement of sustainable development and double carbon goals。
On-site observation and technical exchange
In order to promote green and low-carbon development in the field of transportation，Promote new materials、New technology、New Technology，Liaoning Transportation Development Center，Liaoning Traffic Construction Investment Group organizes relevant personnel respectively.，In conjunction with the operation and management departments of various cities、Design Institute、Jiaotong Academy、The construction unit and the supporting unit held an observation meeting and an indoor exchange meeting on the application of cold in-place recycling maintenance technology for asphalt pavement.，The successful application of this innovative technology was witnessed on the spot.。
Wei has something to say
This time G304 Danho Line based on synchronous paving W 380 CR The cold recycling technology of foamed asphalt is the first application in Liaoning Province.，It is an application innovation based on improving the recycling of waste pavement materials in the process of highway maintenance.，It is a concrete practice to adapt to the development of energy conservation, environmental protection and high quality under the new situation.。
At the same time，Wirtgen's new high-performance pavement recycling technology provides a good reference value for the maintenance of other national and provincial trunk highways in Liaoning Province to open up new structural forms.，It also helps safety.、Convenient、Efficient、Green、The modernization of the economy has contributed new strength to the construction of comprehensive transportation system.。
