The cement is washed away, resulting in a decrease in the cement content. The fine particles are washed away, resulting in unreasonable classification. The moisture content is too high to be compacted. Therefore, in case of heavy rain, the cement and mixture shall be prevented from getting wet in the rain. In case of rain, the construction shall be stopped, and the paved cement soil structure layer shall be rolled and compacted as soon as possible.
The compactness of cement stabilized macadam is close to the density, and the strength mainly depends on the locking principle between macadam. At the same time, there is enough mortar volume to fill the gap of aggregate. Its initial strength is high, and the strength rapidly forms a plate with the increase of age. Therefore, it has high strength, good impermeability and frost resistance.
The cement consumption of cement stabilized macadam is generally 3% ~ 6% of the mixture, and the unconfined compressive strength in 7 days can reach 5.0mpa, which is higher than that of other subgrade materials. Cement stabilized macadam is not muddy after rain and has a solid surface. It is an ideal base material for high-grade pavement.
As an important part of highway foundation, the main function of cement stabilized gravel layer is:
Cement stabilized macadam layer is the transition layer between hard pavement and soil subgrade. It is effectively combined with pavement and subgrade to form an organism.
The cement stabilized macadam layer has certain strength and stiffness. It is higher than the subgrade and lower than the pavement, which not only ensures a certain thickness of the pavement to meet the bearing load, but also reduces the construction cost.
The cement stabilized macadam layer can evenly disperse the vehicle load on the pavement to the subgrade and has a certain toughness.
The gravel and coarse sand in the cement stabilized gravel layer have good water filtering effect, which can reduce the ponding of the subgrade and reduce its bearing capacity.
Generally, the edge stone can be laid 24 hours after the cement stabilized macadam operation in Jinan is completed. The time interval between and masonry should not be too long, otherwise, after the mixture is formed into plates, the plates will harden, increase the construction difficulty, and easily destroy the integrity of the plates by knocking and chiseling the plates.
The maintenance time shall not be less than 7 days. During this period, vehicles are prohibited. Sprinklers spray water 2 to 4 times a day to keep it moist.
Crushed stone is produced by impact crusher, impact crusher or cone crusher. It is forbidden to use crocodile crusher for secondary crushing. Dust removal equipment must be installed on the production line. The specifications of vibrating screen in gravel processing plant are 6mm, 11mm, 22mm and 41mm. The technical index of crushed stone requires that the density is greater than 2.6t/m3 and the crushing value (%) is less than 25%.
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