What are the applications of cold regeneration technology in highway overhaul and maintenance?

一、水稳冷再生技术的概念

1、 Concept of water stable cooling regeneration technology

水稳冷再生技术全称为水泥稳定就地冷再生技术，顾名思义就是在冷环境下对破损的水泥稳定碎石基层进行再生。再生的方法是将原来破损的水泥稳定碎石基层进行清洗破碎，按照不同的碎石规格进行分类，根据大小不同的比例要求混入新的水泥和骨料，进行拌和后就成为了混合再生材料，用这种混合再生材料进行路面的修补就可以称之为水泥稳定就地冷再生技术。

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.

二、水稳冷再生的施工技术要点

2、 Key points of construction technology of water stable cooling regeneration

使用水泥稳定就地冷再生技术进行道路维修的施工工艺流程首先是进行进行维修路段交通道路的封闭，然后进行施工放样确保施工按照图纸进行，将原道路进行清洗并准备好需要添加的原材料，准备好冷再生机组进行破碎和拌和，将混合料进行摊铺碾压，接缝和掉头处进行专业处理，在接受检查监督确认质量合格之后注意养生期间的保养，就可以投入使用了。

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.

（一）施工前的准备工作

（1） Preparation before construction

水泥稳定就地冷再生技术进行施工前，需要许多的准备工作才能进行正式施工。准备工作完成的好坏，决定了之后施工结果的质量好坏，在这些准备工作中，我们主要分为五个方面：首先，我们要对需要进行维修的破损路面进行取样分析，取样时要注意均匀取样，尽量保证取样点所分析出的数据符合道路的整体情况。在进行破旧路面的分析中应当测量出破损路面的水泥碎石各自含量，以及道路建设成功时所需要的抗压强度和含水量。其次，根据已经得出的破损路面的原材料比例选择添加到再生材料中的新材料比例。新材料使用的水泥种类和碎石大小以及改变其性能的添加剂，都要按照前一部的准备工作进行配置，拌和时使用的水可以采取饮用水。然后，我们准备水泥稳定就地冷再生技术施工所使用的机械，包括加工原材料的冷再生机、进行碾压的胶轮压路机、辅助养生的洒水车和其他推土机平地机，等等机械设备。要对这些机械设备进行检查运行状况，对有问题的设备要进行修理，避免出现已经开始施工，由于机械故障所导致的拖延施工时间的事件发生。

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.

（二）再生材料配置过程

（2） Configuration process of recycled materials

在实际现场施工时，我们会发现破旧路面的水泥稳定碎石基层强度仍然很高，对于冷拌再生机来说进行一遍的破碎工作所得到的颗粒是不达标准的，因此我们按照两次进行施工。两次拌和过程中都要不断的检查再生材料的含水量以及原废料的破碎程度，一定要保证做出的再生材料符合公路路面铺设的数据标准。制作完成再生材料之后要进行其性能的测试，保证测试结果符合要求之后再进行下一步施工。

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.

（三）混合料的摊铺和碾压

（3） Paving and rolling of mixture

进行水泥稳定就地冷再生技术公路维修施工过程中，我们不需要租赁使用材料搬运运输车。因为在生材料是就地取得的，可以直接用来摊铺，不需要走运输这一过程，也避免了运输过程中可能出现的离析现象，同时节省了大量资金和人力。在摊铺时要注意缓慢进行，保持在每分钟两到三米的速度，不能急功近利。进行碾压是我们习惯使用振动压路机，碾压时要注意如果时间过长就会产生分层现象，所以要控制碾压时间，过短达不到碾压效果，过长会产生分层影响再生材料修补路面基层的施工质量。

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.

（四）路面养生和监督检查

（4） Pavement maintenance, supervision and inspection

路面养生就是指水泥凝结期间不能有重物压过，在养生期间（一般为一周以上时间）保持路面一定湿度，可以是用塑料薄膜也可以使用淋湿的桔杆麻布等等工具保持路面潮湿。同时要注意严禁车辆在养生期间破坏路面，只允许洒水车定期喷洒水分保持路面潮湿。

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.

对水泥稳定碎石基层冷再生底基层监督检查不仅仅要符合普通公路建设质量评定标准来进行评定，还需要对路面的冷再生材料进行符合公路再生技术规范的质量检查，确定其施工路段的压实度、平整度、抗压强度都符合相关要求才能正式投入使用。

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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