In terms of renovation of old asphalt pavement, Handan City, Langfang City, and Shijiazhuang City in Hebei Province have successively introduced on-site cold recycling equipment for asphalt pavement and conducted large-scale construction attempts, all of which have achieved good economic and social benefits. Practice has proven that it is scientifically feasible to use on-site cold recycling construction technology to renovate old asphalt pavement in response to the current situation of highways in our province.

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， 终修建出一种特殊级配的道路基层（ 或底基层） 。

1. The construction principle of on-site cold recycling of asphalt pavement is not commonly understood as restoring damaged asphalt pavement to its original state, but rather breaking and mixing the old surface layer and part of the base layer, and then rebuilding it on site into a new base layer (or sub base layer). Strictly speaking, this process should be referred to as the in-situ reuse of old asphalt pavement materials. The working principle of cold in place recycling of pavement is to selectively add appropriate aggregate, cement, lime, fly ash, emulsified asphalt, foam asphalt, water and other external materials on the basis of the original old pavement layer according to the new design requirements. Using the cold in place recycling equipment, it is actually a large stabilized soil road mixer, Continuously complete the milling, crushing, adding materials, mixing, paving and other processes of the old pavement layer (road surface and some base layers) on site, followed by leveling and rolling, and finally 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. The applicable scope and advantages of on-site cold recycling. Due to the construction of on-site cold recycling, the surface layer and base layer of the original road are transformed into a new road base (or subbase), resulting in the surface layer of the new road being laid at least on this elevation. Moreover, in high standard road renovations, sometimes the recycled layer is used as the subbase layer, and on this basis, base materials such as lime fly ash and crushed stone are also added, This makes the elevation of the reconstructed road surface much higher than the original elevation, and the design structure of the road surface along the road structure will change accordingly. If this method is used for construction on urban roads, the existing drainage system will also be affected. Therefore, for roads with strict restrictions on road surface elevation, this method should not be used for construction.

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 applicability of on-site cold regeneration is limited by road surface elevation, it still has many advantages compared to traditional construction methods in the vast majority of general road renovations.

（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. Due to the fact that all the materials from the original old road surface are utilized on-site, a series of tasks such as excavation, transportation, and factory processing and backfilling are omitted, greatly simplifying 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 20%~46%。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) According to some construction materials from foreign countries with lower costs, compared to traditional construction methods, due to the full utilization of old road materials, with different thicknesses of recycled layers, the cost can be reduced by approximately 20% to 46%. The deeper the thickness, the greater the cost reduction. Currently, there is not much information summarized in this regard in China. However, based on the quota measurement results of this construction method in our province, it is certain that this process can reduce engineering costs.

（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) Improving the road grade is due to the construction method strengthening the bearing capacity of the foundation. If the new design grading is reasonable, the strength of the recycled layer can reach (13-15Mpa), fundamentally ensuring the improvement of the road grade. This advantage is particularly important for the renovation 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, on-site cold regeneration is carried out under natural conditions. Except for some severe pits that require simple pre-treatment, other road surfaces do not require any treatment. In addition, the one-time construction feature fully utilizes the working time, greatly improving production efficiency. After our on-site measurement, a WR2300L recycling machine can regenerate more than 4000 square meters of road surface for each work team under reasonable organization during the construction of water stabilized roadbed with lime fly ash and crushed stone.

（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) Protecting the environment and resources is achieved by fully utilizing old materials on-site, reducing the extraction of new materials, and eliminating the problem of transporting old materials and randomly disposing of waste materials. The construction process is free from dust and exhaust gas pollution, saving resources and protecting the environment. Therefore, some people call it the "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 can be uninterrupted during construction due to the simple on-site cold regeneration process, which requires very little construction equipment to be put into operation. It is not sensitive to traffic interference! Therefore, in situations where the traffic volume is not too high, "half open to traffic" and half construction can be carried out!

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