Initial pressure: 1 vibratory roller (CA30 type), vibration before standstill 1 pass.
Re-compaction: 2∽3 vibratory rollers (YZJ- 18 type), with each vibration before and after 1 pass.
Final pressure: 2 sets of 30T rubber-tyred rollers, each with constant pressure 1 time.
Road sections without superelevation shall be rolled from the edge to the middle, and the lateral phase displacement of the mixture shall be prevented while ensuring the edge compaction. The rolling speed is generally1.8 ∽ 2.2 km ∕ h; Roller shift should be smooth, and it is forbidden to yank and shove the structural layer; Return by road. In the direction of the paver, the shift position should be staggered to form a tooth shape and return to the original road.
7. A healthy mixture. After the rolling is completed and the compaction degree is qualified, the maintenance shall be carried out immediately without delay. Curing can be carried out by covering impermeable plastic film or wet sand, or by using asphalt emulsion, or by immediately making a lower seal coat on the finished base, or by directly spraying water on the finished mixture. According to the technical specifications, the curing period should not be less than 7d. During the maintenance period, a special person shall be responsible for restricting the driving of vehicles. Heavy vehicles are absolutely forbidden to drive except sprinklers. This bid adopts two ways of keeping in good health, plastic film keeping in good health and watering keeping in good health.
Verb (abbreviation of verb) quality inspection
Test detection is an important link and means of engineering quality management, and objective, accurate and timely detection data is the scientific basis for guiding, controlling and recognizing engineering quality. In the construction of cement stabilized macadam base, because of the inherent characteristics of cement materials, quality inspection is particularly important. We must strengthen the concept of using data to guide production and do a good job in quality control.
1, raw material quality inspection of mixing station
Material name detection project detection purpose frequency quality standard cement physical properties determine whether cement is suitable for material source change or suspected unstable quality. Within the specified range, gravel particle analysis determines that the gradation meets the requirements of 2000m3.
2. The sample conforms to the gravel list.
Gradation requires that the liquid limit plasticity index is less than 0.6mm, and the liquid limit and plasticity index of particles are the same as above.
3, mixture detection
The frequency of inspection items shall be measured by sampling and sieving the cement on the conveyor belt within the specified range once in the afternoon according to the remarks of quality standard inspection methods. The dosage of fly ash shall be checked by EDTA titration every 2 hours, and the water content shall be calculated by sampling and sieving the cement on the conveyor belt every day 1 time or 1 time if necessary within the specified range. Or if necessary, convert the water content into standard water content uniformity by quick frying method, and keep the color uniform at any time without any phenomenon.
4, paving site detection
Description of inspection method for frequency quality standard of inspection items: measure the compaction degree at two places in each rolling section according to the standard sand filling method, and then quickly check the compressive strength of water content (alcohol combustion method). After standing in the morning and afternoon, it should form 1 group 3-5kpa. After soaking for 24 hours during curing, it should be randomly sampled and formed indoors before rolling.