(1) material requirements The materials used in the cement stabilized layer must meet the requirements of specifications or procedures. The macadam used in the stable layer should be clean, hard, with water chestnut and continuous grading. Aggregate gradation shall meet the provisions of No.1 gradation in Table 6.2.4 of Technical Specification for Highway Pavement Base Construction (JTJ34— 2). The content of needle and flake (≥ 1: 3) particles is less than 2%. The cement content of mixing stable layer is 5%, so it is not suitable to use early strength cement. In this project, ordinary portland cement is proposed. Cement dosage is determined by mix proportion test. Each material of cement stabilized macadam layer should be combined with the actual approach materials to determine the mixture ratio. The water content should be strictly controlled in the construction process, and the water content during mixing is slightly higher than that during the test. The specific data should be determined according to the field test, mainly to offset the water loss of lime soil during transportation and the evaporation loss during paving. ⑵ Mixing and transportation: We adopt centralized mixing materials for construction, and strictly control the mixing ratio when mixing. The clinker shall be uniform and consistent, and there shall be no pinch phenomenon. The transportation shall be carried by a 5-ton dump truck, and the transportation road shall be flat and short, so as to avoid segregation and dry materials. (3) Before paving and rolling cement stabilized layer, the quality of base course should be reinspected, and the cement stabilized layer can be paved only after it meets the quality requirements of subdivisional work. (1) paving adopts mechanical paving, and the whole picture is paved and shaped to avoid longitudinal joints. When paving, it is forbidden to use four-toothed harrow or scatter. After paving, a three-person team will be set up behind the roller to eliminate coarse aggregate belt or honeycomb in time, and replenish fine mixture in time to pave smoothly. ② When paving, the throwing height should be determined according to the test of the test road section. It is forbidden to stick the layer. When paving, the principle of "rather high than low, rather shovel than make up" should be mastered. It is forbidden to level or throw with a toothed rake. After paving, the mixture must be rolled within 2 hours, compacted by CA25 vibratory roller, and the edge and well periphery are compacted by small vibratory roller or manual compaction. When rolling, it should be static before vibration, edge before middle, and the wheel tracks should overlap by more than one third of the wheel width. The number of rolling passes shall be determined according to the field test sections. It is forbidden to turn, turn around and brake suddenly on the sections that have just been compacted or are being compacted, so as to ensure the quality of grass-roots units. The rolling time of the mixture should be close to the optimum water content. When the weather is hot and evaporation is fast, the paving time should be avoided at noon. When the base layer is not paved with sealing layer, it is forbidden to open traffic and protect the surface layer from pollution and destruction. Construction vehicles should drive slowly, and the driving speed should not be greater than 3km/h. .6 Rolling of water-stable granular materials ① According to the road width, the wheel width and the wheel pitch of the road roller, the rolling scheme should be made, and the times of rolling each part should be the same as far as possible, and the two sides of the road surface should be pressed 2~3 times more. (2) After shaping, when the water content of the water-stabilized material is the optimal water content (+1% ~ +2%), it should be immediately rolled with a light roller within the full width of the structural layer. Straight lines and horizontal curve segments without superelevation shall be rolled from shoulders on both sides to the center of the road; The wheel width should be overlapped by 1/2, and the rear wheel must exceed the joint of the two sections. When the rear wheel presses the full width of the road surface, it will be once. After rolling it twice with a light roller, it will be recompressed with a heavy roller. Generally, it needs to be rolled for 6~8 times. The rolling speed of the roller should be 1.5km/h~1.7km/h for the first two times, and 2.km/h~2.5km/h for the future. Data of the water-stable layer: ③ It is forbidden for the roller to turn around or brake suddenly on the completed or rolling section, and the surface of the water-stable layer should be guaranteed not to be damaged. (4) In the process of rolling, the surface of cement stabilized layer should always be moist. If the water evaporates too quickly, a small amount of water should be added in time, but it is forbidden to sprinkle water for rolling. ⑤ In the process of rolling, if there are "spring", looseness, peeling and other phenomena, it should be turned over in time to mix again (add appropriate amount of cement) or treated by other methods to meet the quality requirements. ⑥ After mixing and shaping, the cement stabilized layer should be rolled before the initial setting of cement and within the delay time determined by the experiment to achieve the required compactness, and there is no obvious wheel track at the same time. ⑦ Before the end of rolling, use a grader to level it once again, so as to make it longitudinal and comfortable, and the road arch and elevation meet the design requirements. Final leveling should be carefully carried out, and the local higher part must be scraped off and swept out of the way; For local low-lying areas, no more mending is needed, which can be left to be treated when paving asphalt surface or concrete surface.