2. Before paving asphalt concrete, spray construction seal oil.
3. Before the construction of the middle surface layer and the upper surface layer, the adhesive layer oil shall be constructed on the lower surface layer and the middle surface layer respectively.
Asphalt pavement construction process:
1, dust, loose particles and sundries should be removed from the old pavement, cleaned and the surface should be kept dry. Sharp and steep parts of the road surface should be leveled; For severely damaged and damaged pavements, the damaged parts should be carved from the roots and repaired with asphalt concrete. For pavement with serious cracks or rutting, a leveling layer of 1 ~ 2 cm should be paved.
2. Sprinkle asphalt binder oil
When liquid petroleum asphalt is used as viscous layer oil, the atmospheric temperature is above 5℃; When emulsified asphalt is used as binder oil, the atmospheric temperature is above 10℃. In rainy days and when the road is wet after rain, it is not allowed to stick oil backwards. Attention should be paid to selecting the variety and dosage of viscous oil. Practice has proved that it is best to use EVA or SBS modified asphalt. These products have good crack resistance and thermal stability. If emulsified asphalt is used, its asphalt content must be greater than 60% to make full use of it.
Before the geotextile is laid, the asphalt bonding layer is sprayed once, and the dosage is about 0.4 ~ 0.6 kg/m2, then the geotextile is laid, and then a layer of the same type of bonding layer oil is sprayed on the geotextile, and the dosage is about 0.5 ~ 0.6 kg/m2. The following points should be noted: (1) It is recommended to use hot asphalt laminated sleeve, and the oil temperature should be kept between 150 ~ 170℃; ⑵ The lateral range of gunning oil is 5 ~10 cm wider than geotextile; (3) Viscous oil should be sprayed evenly and measured accurately.
If the oil is poured once, the total amount of viscous oil cannot be reduced. The recommended value is 1.0 ~ 1.3 kg/m2, and the oil temperature should not be lower than 180℃. Once the oil is poured, it is easy to cause the geotextile to be impermeable and delaminated, resulting in the surface layer peeling off.
reference data
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