The preparation work before the construction of the cold regenerator mainly includes personnel preparation, machinery preparation, material preparation, traffic coordination and logistics support.
(1) Material requirements: Portland or ordinary portland cement with strength grade of 32.5, initial setting time ≥ 3h, final setting time ≤ 10h and ≥ 6h shall be selected. Cement shall have good workability, low hydration, high late strength, durability, corrosion resistance and crack resistance.
(2) Mechanical requirements: the construction process of the project is completed by the regeneration unit, which includes: cold regeneration host, cement slurry truck, grader, roller, etc.
(3) Personnel requirements: Engineering and technical personnel and mechanical operators shall be trained in cold regeneration and qualified after examination.
(4) Project coordination: make the overall construction plan, take half width construction without interrupting traffic, do a good job of traffic diversion during construction, and prepare for the shelter of the construction working surface.
2. Construction scheme
A. General provisions
(1) Measure and investigate the road conditions of the original road surface, use a milling machine to mill the places 5cm above the original road surface elevation, and fill the milled old road materials in the pits 5cm above the original road surface elevation.
(2) The original road shall be intensively excavated and tested, and the original asphalt pavement shall be sampled with a cold recycling machine for standard compaction test to determine the appropriate water content and maximum dry density.
(3) During the construction process, adjust the water consumption set by the regenerator in time according to the water content of the recycled material, pay close attention to the weather changes, and avoid regeneration construction in rainy days.
B. Construction of test section
Before the formal commencement of the project, 300m road is selected as the test section to determine whether the condition of the existing road is consistent with the design requirements, and work is carried out in the aspects of cold regeneration gradation, rotor speed, walking speed of regeneration machinery and compaction process, so as to accumulate necessary data for the formal construction of other sections.
After leveling the regenerative layer with the grader, use 22T vibratory roller (static pressure when moving forward, vibration when returning) to roll for one time, then use the self weight 26t vibratory roller to roll for two to three times, and then use the rubber tyred roller to finally roll for one time. During rolling, the flatness shall be strictly controlled according to the specification requirements.
(2) Health preservation
After the rolling test is qualified, the plastic film shall be used to cover the curing in time, and all traffic shall be interrupted during the curing period. Due to the busy May 1st Road, the curing period is 7 days. During the curing period, the surface of the cold recycled base course is always wet, and special personnel are assigned to take care of it every day to ensure that the recycled layer is not damaged due to improper curing.
(3) Open traffic
After the construction of the cold recycling machine, after the pavement strength meets the requirements, use the air compressor to blow away the floating ash, sprinkle the prime coat oil, sprinkle the stone chips on it, and then open the traffic.
The above is a detailed introduction about the rental of cold regenerator, which I hope will help you. If you have any questions, please contact us. We will provide services for you with a professional attitude https://www.sddhfjx.com