Construction of Cement Stabilized Gravel Base (1). Preparation materials before construction must be tested in accordance with technical specifications. 32.5# cement is used at the grass-roots level, and the cement with fast hardening, early strength and moisture deterioration must be discarded. The maximum particle size of granular materials shall not exceed 31.5mm, and meet the requirements of fine particle range in technical specification tables 306-65,438+0 and 304-65,438+0. At the same time, the composition design should meet the requirements of compressive strength. (II) Construction Requirements The construction requirements of cement stabilized base course are as follows: 1, mixing and transportation ①, mixing of cement stabilized mixture ②, mixing equipment of factory mixing shall be approved by the supervision engineer when matching and debugging, so that the particle composition and cement content of the mixed mixture meet the specified requirements. (3), transport vehicles must be equipped with enough loading capacity, and pay attention to uniform loading and prevent segregation (4), when the paving site is far from the mixing station, the mixture should be covered in transportation to prevent moisture evaporation. 2, paving integer ①, the mixture is paved with ABG-4 1 1 paver, and the loose paving thickness should be set when paving, so that the mixture is evenly spread on the required width. (2) When paving, the water content of the mixture should be 0.5-2% higher than the optimal water content (depending on the climate) to compensate the hydration loss during paving and rolling. 3. Rolling ① The rolling procedure of the mixture shall be carried out according to the method determined in the test section. (2), in the process of rolling, the surface of cement stabilized base should always be moist. If the surface water evaporates quickly, it should be supplemented with appropriate amount of water in time. ③ It is forbidden for the roller to "turn around" and suddenly brake on the completed or final rolling layer to ensure that the surface of cement stabilized base is not damaged. (4) During construction, the delay time from mixing with water to the end of rolling shall not exceed the final setting time of cement, and it shall be strictly controlled according to the appropriate delay time determined in the test section. 4. The treatment of joints and U-turn construction joints and U-turn of road rollers shall be carried out in accordance with the Technical Specification for Construction of Highway Pavement Base by the Ministry of Communications. 5. After the compaction reaches the required degree of compaction, it shall be cured immediately, and the curing time shall not be less than 7 days. Two sprinklers are mainly used for maintenance, and other vehicles are prohibited from passing during maintenance. After reaching the curing period, it should be closed in time to protect the surface of the base from damage and ensure the quality of the base. 6, cement stabilized construction site sampling and testing, should be sampled once a day or 2000 square meters, check whether the mixture ratio is within the prescribed scope; The water content, cement content and unconfined compressive strength of the mixture are tested according to the standard method of "Test Specification for Stabilized Materials in Highway Engineering". Compaction test shall be carried out on the completed pavement according to the Code for Field Test of Highway Pavement Subgrade, and the test shall be carried out for more than 6 times per operation section or not exceeding 2,000m2. All test results shall be operated by the supervision engineer and submitted to the supervision engineer for approval. 7, cement stabilized granular base inspection items and inspection standards according to the "technical specification". The specified value or allowable deviation test method and frequency of the measured project of cement stabilized granular base are specified. Subbase subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subhighway Other Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subbase Subhighway Subbase Subbase Subbase Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subbase Subbase Subbase Subbase Subbase Subbase Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Subhighway Sub 438+0 2 flatness (mm) 8121215 3m straightedge: measure two longitudinal section elevations (mm) +5,-10+5 and -65433 every 200m. —Grade 20: Measure the width (mm) of four sections every 200m, which shall not be less than the design value; Measure the thickness (mm) of four sections every 200m, representing the value of-8-10-10-12; On each lane at 1, check 20 poles every 200 meters. -306 cross slope (%) 0.3 0.5 0.3 0.5 level: measure the strength (Mpa) of four sections every 200m and meet the design requirements; Check 20 according to appendix g.