道路冷再生施工前材料准备

Material preparation before road cold recycling construction

在实际的道路冷再生施工作业过程中，主要用到的施工材料有沥青面层铣刨料、水泥和水等等。通常大部分施工单位在选择水泥时，由于考虑到水泥化热问题，所以一般都会采用硅酸盐水泥，或是矿渣硅酸盐水泥等，这是因为此类水泥含有的水泥化热量较少，能够防止施工裂缝的出现。

In the actual process of road cold recycling construction, the main construction materials used include asphalt surface milling materials, cement, water, and so on. Usually, when most construction units choose cement, they usually use Portland cement or slag Portland cement due to consideration of the heat of cement formation. This is because these types of cement contain less heat of cement formation, which can prevent the occurrence of construction cracks.

并且，施工单位还要对新入厂的水泥质量进行严格的控制，坚决不允许使用变质的水泥。其次，施工单位还需要确保水泥强度真正达到了国家规定标准要求，无论是水泥龄期，还是稳定性，都满足了工程施工要求。而一般水泥初凝时间都在3-5小时左右，最后的终凝时间大概在6小时。

Moreover, the construction unit must strictly control the quality of newly imported cement and strictly prohibit the use of deteriorated cement. Secondly, the construction unit also needs to ensure that the cement strength truly meets the national standard requirements, whether it is the cement age or stability, it meets the construction requirements of the project. And generally, the initial setting time of cement is around 3-5 hours, and the final setting time is about 6 hours.

另外，道路冷再生施工工艺对于用水方面有着较高的要求，施工单位应该尽量采用饮用水，或是完全没有毒害物质的纯净水。再者，在对铣刨料选用时，也要确保料粒直径规格的一致，必须切实结合工程施工需要，选择出合适理想的铣刨料。最后，碎石作为基层混合料中主要的构成材料，应当对其强度、压碎值等当面进行规范要求。

In addition, the road cold recycling construction process has high requirements for water use, and construction units should try to use drinking water or pure water that is completely free of toxic substances. Furthermore, when selecting milling materials, it is also necessary to ensure the consistency of particle diameter specifications, and it is necessary to select suitable and ideal milling materials based on the needs of engineering construction. Finally, as the main constituent material of the base mix, crushed stone should be subjected to standardized requirements for its strength, crushing value, and other aspects.

道路冷再生混合料配合比设计

Mix proportion design of road cold recycled mixture

在道路冷再生混合料配合比设计中主要包括3个方面，如原材料分析、配合比设计及设计配合比检验。遵循《公路工程路而基层施工技术规范》进行混合料配合比的准确设计，确保施工质量。

In the design of road cold recycled mixture mix proportion, there are mainly three aspects, such as raw material analysis, mix proportion design, and design mix proportion inspection. Follow the Technical Specification for Construction of Road Base in Highway Engineering to accurately design the mix proportion of the mixture and ensure construction quality.

道路冷再生施工工艺的应用流程

Application process of road cold recycling construction technology

1.施工放样：按照原有路基铣刨过的标高和冷再生混合料底新铺基层的设计标高及经试验段确定的松铺系数，将新铺底基层的摊铺高程计算出来，并进行施工放样作业。

1. Construction layout: Calculate the paving elevation of the newly laid sub base layer based on the original roadbed milling elevation, the design elevation of the cold recycled mixture base layer, and the loose paving coefficient determined by the test section, and carry out construction layout operations.

2.路面平整：将原有路面存有的杂物清理干净，将边线也清理干净，同时将再生路段上面的井盖等结构物清除，将原有路面进行翻浆、车辙、沉陷等病害处理作业，确保原有路面的平整性。

2. Road surface leveling: Clean up the debris and edges of the original road surface, as well as remove the manhole covers and other structures on the reclaimed road section. Conduct damage treatment operations such as mud turning, rutting, and sinking to ensure the smoothness of the original road surface.

3.准备新加料：在每平米新料添加量的计算中必须严格遵循原有路内再生深度的平均密度进行计算。按照每车料的多少进行其堆放距离的确定。在对每平方米稳定层水泥用量计算时，必须严格遵循水泥剂量要求进行，并对水泥摆放的纵横间距进行确定。

3. Prepare new materials: In the calculation of the amount of new materials added per square meter, it is necessary to strictly follow the average density of the original road regeneration depth for calculation. Determine the stacking distance based on the amount of materials in each vehicle. When calculating the cement dosage for each square meter of stable layer, it is necessary to strictly follow the cement dosage requirements and determine the longitudinal and transverse spacing of cement placement.

4.冷再生拌和：在原有路面上水车在冷再生机租赁的推动下前行，遵循原有路面损坏情况及再生深度对行驶速度进行适当地调整及控制，通常都会将速度控制在每分钟6到12米，确保铣刨后料的级配不会产生较大的波动，在网裂较为严重的路段，必须将再生机组的行驶速度进行有效降低，并将铣刨转子的转速进行适量地提升。在再生机行驶中必须有工作人员跟随在其后面，以便对再生深度进行随时检查，同时还要对水泥含量及混合料的含水量进行检测，调整时，要与再生机工作人员相配合。

4. Cold regeneration mixing: The water truck is driven by the cold regeneration machine rental on the original road surface, and the driving speed is adjusted and controlled appropriately according to the damage and regeneration depth of the original road surface. Usually, the speed is controlled at 6 to 12 meters per minute to ensure that the grading of the milled material will not have significant fluctuations. In sections with severe network cracks, the driving speed of the regeneration unit must be effectively reduced, and the speed of the milling rotor must be appropriately increased. During the operation of the regeneration machine, there must be staff following behind to check the depth of regeneration at any time. At the same time, the cement content and water content of the mixture must also be detected. When adjusting, cooperation with the regeneration machine staff is necessary.

5.碾压整形：再生机施工后初压时，应选用钢轮振动压路机，压实过程中要选用高幅低频压实，压实遍数必须符合再生层底部2/3厚度范围内的压实度。钢轮压路机行驶速度必须控制在每小时3千米以下。在完成初压后，整形施工可以选用平地机进行。

5. Rolling and shaping: After the construction of the recycling machine, a steel wheel vibratory roller should be used for initial compaction. During the compaction process, high amplitude and low frequency compaction should be used, and the number of compaction passes must meet the compaction degree within 2/3 of the thickness range of the bottom of the recycling layer. The driving speed of the steel wheel roller must be controlled below 3 kilometers per hour. After completing the initial compaction, the shaping construction can be carried out using a grader.

按照从两侧向中间的顺序平地机在直线路段上进行施工，特殊情况下，还要在进行一次刮平作业。按照从中间到两侧的顺序平地机在曲线路段进行刮平作业。碾压施工中遵循先边部后中间、由轻到重、由慢到快的顺序进行，特别是超高路段必须遵循从中间到两边的顺序进行碾压施工。

According to the order from both sides to the middle, the grader is used for construction on a straight road section. In special circumstances, a scraping operation must also be carried out. The grader performs leveling operations on curved road sections in order from the middle to both sides. During compaction construction, the order of starting from the edge and then the middle, from light to heavy, and from slow to fast must be followed, especially for ultra-high road sections where compaction construction must follow the order from the middle to both sides.

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