道路冷再生施工前材料準備

Material preparation before road cold recycling construction

在實際的道路冷再生施工作業過程中，主要用到的施工材料有瀝青面層銑刨料、水泥和水等等。通常大部分施工單位在選擇水泥時，由于考慮到水泥化熱問題，所以一般都會采用硅酸鹽水泥，或是礦渣硅酸鹽水泥等，這是因為此類水泥含有的水泥化熱量較少，能夠防止施工裂縫的出現。

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，施工單位還要對新入廠的水泥質量進行嚴格的控制，堅決不允許使用變質的水泥。其次，施工單位還需要確保水泥強度真正達到了國家規定標準要求，無論是水泥齡期，還是穩定性，都滿足了工程施工要求。而一般水泥初凝時間都在3-5小時左右，最后的終凝時間大概在6小時。

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，道路冷再生施工工藝對于用水方面有著較高的要求，施工單位應該盡量采用飲用水，或是完全沒有毒害物質的純凈水。再者，在對銑刨料選用時，也要確保料粒直徑規格的一致，必須切實結合工程施工需要，選擇出合適理想的銑刨料。最后，碎石作為基層混合料中主要的構成材料，應當對其強度、壓碎值等當面進行規范要求。

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設計

Mix proportion design of road cold recycled mixture

在道路冷再生混合料配合比設計中主要包括3個方面，如原材料分析、配合比設計及設計配合比檢驗。遵循《公路工程路而基層施工技術規范》進行混合料配合比的準確設計，確保施工質量。

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.

道路冷再生施工工藝的應用流程

Application process of road cold recycling construction technology

1.施工放樣：按照原有路基銑刨過的標高和冷再生混合料底新鋪基層的設計標高及經試驗段確定的松鋪系數，將新鋪底基層的攤鋪高程計算出來，并進行施工放樣作業。

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：將原有路面存有的雜物清理干凈，將邊線也清理干凈，同時將再生路段上面的井蓋等結構物清除，將原有路面進行翻漿、車轍、沉陷等病害處理作業，確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.準備新加料：在每平米新料添加量的計算中必須嚴格遵循原有路內再生深度的平均密度進行計算。按照每車料的多少進行其堆放距離的確定。在對每平方米穩定層水泥用量計算時，必須嚴格遵循水泥劑量要求進行，并對水泥擺放的縱橫間距進行確定。

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：在原有路面上水車在冷再生機租賃的推動下前行，遵循原有路面損壞情況及再生深度對行駛速度進行適當地調整及控制，通常都會將速度控制在每分鐘6到12米，確保銑刨后料的級配不會產生較大的波動，在網裂較為嚴重的路段，必須將再生機組的行駛速度進行有效降低，并將銑刨轉子的轉速進行適量地提升。在再生機行駛中必須有工作人員跟隨在其后面，以便對再生深度進行隨時檢查，同時還要對水泥含量及混合料的含水量進行檢測，調整時，要與再生機工作人員相配合。

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.碾壓整形：再生機施工后初壓時，應選用鋼輪振動壓路機，壓實過程中要選用高幅低頻壓實，壓實遍數必須符合再生層底部2/3厚度范圍內的壓實度。鋼輪壓路機行駛速度必須控制在每小時3千米以下。在完成初壓后，整形施工可以選用平地機進行。

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.

按照從兩側向中間的順序平地機在直線路段上進行施工，特殊情況下，還要在進行一次刮平作業。按照從中間到兩側的順序平地機在曲線路段進行刮平作業。碾壓施工中遵循先邊部后中間、由輕到重、由慢到快的順序進行，特別是超高路段必須遵循從中間到兩邊的順序進行碾壓施工。

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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