Common problems in water stability construction of cold regenerator1．水泥平稳砂砾石农村基层施工时，务必选用流水线作业法，使各工艺流程密不可分对接。非常是要尽可能减少从搅拌到进行碾压中间的延迟时间。
1. During the construction of cement stabilized sand gravel rural base, the production line operation method must be selected to make the process flow inseparable. It is very important to minimize the delay time between mixing and rolling.
2. It is necessary to test the damage of delay time of cement stabilized layer on its compressive strength, so as to determine the suitable delay time.
3. The daily low temperature in the construction period should be above 5 ℃.
4. During the construction of cement stable layer in rainy season, attention should be paid to the climate problem, so as to avoid the cement and mixture from getting wet. The construction shall be terminated when dewatering, but the paved cement mixture shall be compacted as soon as possible.
5. During the construction of stable cement layer, the seasoning must be accurate; the water spraying and mixing should be even.
6. The thickness and elevation of rural base should be strictly controlled, and the slope rate of road arch should be consistent with the overall surface course.
7. Rolling should be carried out when the mixture is in or slightly higher moisture content (when the weather is hot and dry, the rural base course mixture can be 1% - 2%) until the compactness is ≥ 98% (super heavy compaction specification) and the seven day tensile strength is ≥ 4MPa.
8. The above 18t three wheel roller, super heavy small roller and rubber tyred roller shall be used for rolling. When rolling with 18-32t small roller, the tamping thickness of each layer shall not exceed 20cm. When the tamping thickness exceeds the requirements mentioned above, it should be paved in layers. The less compacted thickness of each layer is 10cm, and the next layer should be slightly thicker. The light type vibratory roller shall be selected first and then the super heavy vibratory roller shall be used for rolling.
9. It is forbidden to use chromatography decompression method to carry out ground leveling;10.务必保证潮湿，不使平稳层表层干躁，都不应忽干忽湿。
10. Be sure to ensure that the surface of the stable layer is not dry or wet.
11. When the cement is stable and the rural base is not paved with prime coat or overall surface course, all mobile vehicles are strictly prohibited except that the construction vehicle can drive at a slow speed (no more than 30km / h).
12. During the construction of double-layer cold regenerator, the chromatographic cement or cement paste should be sprayed on the top of the next layer of wall before paving the top layer.
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