What are the applications of cold regeneration technology in highway overhaul and maintenance?
1、 Concept of water stable cooling regeneration technology
The full name of water stabilized cold regeneration technology is cement stabilized in situ cold regeneration technology. As the name suggests, it is to regenerate the damaged cement stabilized macadam base in a cold environment. The recycling method is to clean and crush the original damaged cement stabilized macadam base, classify it according to different specifications of macadam, mix new cement and aggregate according to the requirements of different proportions of size, and then mix it to become a mixed recycled material. Repairing the pavement with this mixed recycled material can be called cement stabilized in situ cold recycling technology.
2、 Key points of construction technology of water stable cooling regeneration
The construction process of road maintenance using cement stabilized on-site cold recycling technology is to first close the traffic roads of the maintenance sections, then set out the construction to ensure that the construction is carried out in accordance with the drawings, clean the original roads and prepare the raw materials to be added, prepare the cold recycling unit for crushing and mixing, pave and roll the mixture, and professionally treat the joints and U-turns, After receiving inspection and supervision and confirming that the quality is qualified, pay attention to the maintenance during the curing period, and then it can be put into use.
（1） Preparation before construction
Before the construction of cement stabilized on-site cold recycling technology, it needs a lot of preparation work to carry out the formal construction. The quality of the subsequent construction results depends on the completion of the preparatory work. In these preparatory work, we are mainly divided into five aspects: first, we need to sample and analyze the damaged pavement that needs to be repaired. When sampling, we should pay attention to uniform sampling, and try to ensure that the data analyzed at the sampling point conforms to the overall situation of the road. In the analysis of the worn pavement, the respective contents of cement and crushed stone of the damaged pavement, as well as the compressive strength and water content required for the successful construction of the road should be measured. Secondly, the proportion of new materials added to recycled materials is selected according to the proportion of raw materials of the damaged pavement. The type of cement used in new materials, the size of crushed stones and the additives that change their performance should be configured according to the preparation work in the previous part. The water used in mixing can be drinking water. Then, we will prepare the machinery used in the construction of cement stabilized on-site cold recycling technology, including the cold recycling machine for processing raw materials, the rubber tyred roller for rolling, the watering cart for auxiliary curing and other bulldozers, graders, and other mechanical equipment. Check the operation condition of these mechanical equipment and repair the faulty equipment to avoid the occurrence of the event of delaying the construction time caused by mechanical failure after the construction has begun.
（2） Configuration process of recycled materials
During the actual site construction, we will find that the strength of the cement stabilized crushed stone base of the worn road surface is still very high, and the particles obtained from the crushing work of the cold mix regenerator are not up to the standard, so we carry out the construction twice. During the two mixing processes, the water content of recycled materials and the crushing degree of raw waste materials should be continuously checked to ensure that the recycled materials meet the data standards of highway pavement laying. After the production of recycled materials, its performance should be tested to ensure that the test results meet the requirements before the next step of construction.
（3） Paving and rolling of mixture
In the process of road maintenance and construction of cement stabilized in situ cold recycling technology, we do not need to rent and use material handling trucks. Because the raw materials are obtained locally, they can be directly used for paving without the need for transportation, which also avoids the segregation phenomenon that may occur in the transportation process, and saves a lot of money and manpower. When paving, pay attention to slow down and maintain the speed of two to three meters per minute. Don't be eager for quick success and instant benefit. For rolling, we are used to using vibratory roller. When rolling, we should pay attention to the layering phenomenon if the time is too long. Therefore, we should control the rolling time. If it is too short, the rolling effect will not be achieved, and if it is too long, layering will occur, which will affect the construction quality of repairing the pavement base with recycled materials.
（4） Pavement maintenance, supervision and inspection
Pavement curing refers to that no heavy objects can be pressed during the cement setting period. During the curing period (usually more than a week), the pavement can be kept wet by using plastic film or wet hessian and other tools. At the same time, it should be noted that vehicles are strictly prohibited from damaging the road surface during the curing period, and only sprinklers are allowed to spray water regularly to keep the road wet.
The supervision and inspection of the cold recycled subbase of the cement stabilized macadam base should not only be evaluated according to the quality evaluation standard of ordinary highway construction, but also the quality inspection of the cold recycled materials of the pavement in line with the technical specifications of highway recycling, so as to ensure that the compactness, flatness and compressive strength of the construction section meet the relevant requirements before they can be officially put into use.
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