How to construct cold recycling machinery for old asphalt pavement

1、就地冷再生的施工原理沥青路面就地冷再生并不是人们通常所理解的将已破损的沥青路面重新恢复到完好的原始状态，而是将旧面层和部分基层一并打碎混合之后就地改建成新的基层（或底基层）。严格地讲，此工艺应该称之为旧沥青路面材料的就地再利用。路面就地冷再生的工作原理，是在原有旧路铺层的基础上，按照新的设计要求，选择性地掺入适量的骨料、水泥、石灰、粉煤灰、乳化沥青、泡沫沥青和水等外加材料，利用就地冷再生设备，实际上就是一台大型的稳定土路拌机）,在自然常温下，就地连续完成对旧铺层（路面和部分基层）的铣刨、破碎、添加料、拌和、摊铺等工序，随后进行找平和碾压，修建出一种特殊级配的道路基层（或底基层）。

1. Construction principle of in-situ cold recycling asphalt pavement in-situ cold recycling is not generally understood to restore the damaged asphalt pavement to the intact original state, but to break and mix the old surface course and part of the base course, and then transform it into a new base course (or subbase). Strictly speaking, this process should be called in-situ reuse of old asphalt pavement materials. The principle of cold in place recycling is to select the right amount of aggregate, cement, lime, fly ash, emulsified asphalt, foam asphalt and water, and use the local cold recycling equipment on the basis of the old pavement. Milling, crushing, adding materials, mixing, paving and other processes of the old paving layer (pavement and part of the base course) shall be continuously completed on site, and then leveling and rolling shall be carried out to build a special graded road base (or subbase).

2、就地冷再生的适用范围和优点由于就地冷再生施工是将原道路的面层和基层变成了新的道路基层（或底基层）,致使新道路的面层少要在此标高的基础上开始铺筑，况且在高标准的道路改造中，有时是将再生层作为底基层，在此基础上还要加铺二灰碎石等基层材料，这就使得改造之后的路面标高远远大于原来路面的标高，沿路构造物处路面的设计结构将随之发生变化。如果在城市道路中采用此法施工，原有的排水系统也将随之受到一些影响。因此，对于路面标高有较严格限制的道路，不宜采用此法施工。

2. Application scope and advantages of in-situ cold recycling construction because in-situ cold recycling construction changes the surface course and base course of the original road into a new road base (or subbase), the surface course of the new road must be paved at least on the basis of this elevation. Moreover, in high standard road reconstruction, sometimes the recycled layer is used as the subbase, On this basis, lime fly ash macadam and other base materials should be paved, which makes the elevation of the reconstructed pavement far greater than that of the original pavement, and the design structure of the pavement along the road structure will change accordingly. If this method is used in urban roads, the original drainage system will also be affected. Therefore, this method is not suitable for roads with strict restrictions on pavement elevation.

虽然就地冷再生的适用范围受到路面标高的限制，但在多数的一般道路改造中，与传统的施工方法相比，依然具有诸多的优点。

Although the application scope of in-situ cold regeneration is limited by the pavement elevation, it still has many advantages compared with the traditional construction methods in most general road reconstruction.

（1）工序简单由于原有旧路面的材料全部被就地利用，省略了挖掘6外运6厂内加工及回填等一系列工作，使得施工工序大大简化。

(1) The process is simple. Because all the materials of the original old pavement are used locally, a series of work such as excavation 6, outward transportation 6, processing and backfilling in the plant are omitted, which greatly simplifies the construction process.

（2）成本较低国外的一些施工资料显示，与传统的施工方法相比，由于旧的道路材料得以全部利用，随着再生层厚度的不同，大致可以降低成本。厚度越深，降低成本越多，我国目前在这方面总结的资料还不多，但就从我省对该施工法进行的定额测定结果来看，此工艺能够降低工程成本是肯定的。

(2) The cost is low. Some foreign construction data show that compared with the traditional construction methods, due to the full utilization of the old road materials, the cost can be roughly reduced with the different thickness of the regeneration layer. The deeper the thickness, the more the cost will be reduced. At present, there is not much data summarized in this regard in China, but from the quota measurement results of this construction method in our province, it is certain that this process can reduce the project cost.

（3）提高道路等级由于该施工法强化了基础的承载能力#如果新的设计级配合理，可使再生层的强度达到（13-15Mpa），从根本上保证了道路等级的提高。这一优点对于低等级道路的改造尤为重要。

(3) Improve the road grade because the construction method strengthens the bearing capacity of the foundation # if the new design grading is reasonable, the strength of the regeneration layer can reach (13-15mpa), which fundamentally ensures the improvement of the road grade. This advantage is particularly important for the reconstruction of low-grade roads.

（4）生产效率高就地冷再生是在自然条件下进行的，除了个别严重的坑槽需要简单的预处理外，其余路面均不需要任何处理。再加之一次性通过的施工特点，充分地利用了作业时间，因此大大地提高了生产效率，在水稳路基二灰碎石施工时，经过我们的实地测定，一台WR2300L型再生机，在组织合理的情况下，每个工作台班可以再生路面4000㎡以上。

(4) High production efficiency, in-situ cold regeneration is carried out under natural conditions. Except that some serious pits need simple pretreatment, other roads do not need any treatment. In addition, the construction characteristics of one-time passing make full use of the operation time, so the production efficiency is greatly improved. During the construction of lime fly ash macadam for water stabilized subgrade, after our field measurement, a wr2300l regenerator can regenerate more than 4000 m2 of pavement for each working shift under the condition of reasonable organization.

（5）保护环境和资源因为旧料得以全部就地利用，减少了新材料的开采，也不存在旧料运输和废料随意弃放的问题，施工过程没有粉尘和废气的污染，节约了资源，保护了环境，因此有人称之为“绿色”施工技术！

(5) Protect the environment and resources. Because the old materials can be fully utilized locally, the mining of new materials is reduced, and there is no problem of old material transportation and waste disposal at will. There is no dust and waste gas pollution in the construction process, which saves resources and protects the environment. Therefore, some people call it "green" construction technology!

（6）可以不中断交通施工由于就地冷再生工序简单“投入现场的施工设备很少”对交通干扰反应不敏感！故此在交通量不太大的情况下“可以半幅通车”半幅施工！

(6) Traffic construction can be carried out without interruption. Due to the simple process of local cold regeneration, "there are few construction equipment on site" is not sensitive to traffic interference! Therefore, under the condition that the traffic volume is not too large, it can be "opened to traffic" and constructed in half!

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