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Geotextile Construction Process
Dec 19, 2018

First, the old road surface treatment 

1, the old road surface to remove dust, loose particles and debris, clean up, the surface remains dry. The sharp and abrupt parts of the road are flattened, and the broken parts should be eradicated and repaired with asphalt concrete when the road surface is badly damaged and broken.

For roads with severe cracks or ruts, it is necessary to fill a layer of 1~2cm leveling layer.

2. Sprinkle asphalt Adhesive Layer Oil When liquid petroleum bitumen is used for viscous oil, the atmospheric temperature is more than 5 ℃, and the atmospheric temperature is more than 10 ℃ when the emulsified asphalt is used in the viscous layer oil. Do not pour sticky oil when the road is wet on rainy days and after rain. Attention should be paid to the selection of good viscosity oil varieties and dosage. Practice has proved that it is best to use asphalt modified by Eva or SBS, these products have good crack resistance and thermal stability. If emulsified asphalt is used, its bitumen content must be greater than 60% to make good use of it. Sprinkle the geotextile before laying the asphalt adhesive layer pumping, the dosage is about 0·4~0·6kg/m2, and then spread geotextile, and then sprinkle a layer of the same type of sticky oil on the geotextile, the dosage of about 0·5~0·6kg/m2.

The following points should be noted:

 (1) It is recommended to use hot asphalt adhesive sleeves, oil temperature to maintain between 150~170℃, 

(2)spray viscous layer oil transverse range than geotextile width 5~10cm, 

(3) adhesive layer Oil spraying should be uniform, measurement should be accurate. If the use of one-time pouring oil, the total amount of sticky oil can not be reduced, the recommended value of 1·0~1·3kg/m2, oil temperature can not be less than 180 ℃.

Primary pouring oil is easy to appear geotextile immersion, stratification, and lead to surface stripping phenomenon.

Second, the laying and splicing of geotextile 

1, Geotextile is best to use mechanical erection, can also be used artificial laying.

When laying, care should be taken to let the rough side of the burning hair up, and then the end with a fixator fixed, with mechanical or human tightening, tensile elongation about 1 0%~1 5%, straight close to the road forward laying. The fixer comprises a fixing nail and a fixed tin.

Fixed nails should be made of cement nails or nails, nailed long 8~10cm; fixed tin can be used thick lmm, wide 3mm of iron strips.

 2, geotextile transverse connection about 4~5cm, according to the direction of paving, the back end of the press under the front end, with hot bitumen or emulsified asphalt cementing good, fixed with a fixator; longitudinal bonding is also about 4~5cm, which can be used directly with bonded oil to dry knot. By taking over the width, the interlayer becomes thicker, and the bonding force of the surface layer and the base is weakened, which can easily lead to the adverse effects such as drum, detachment and displacement of the surface layer.Therefore, take over the width of the area should be cut off. 

3, geotextile should be paved as far as possible in a straight line. When a turn is required, the fabric is bent and cut open, overlapping and sprayed with adhesive layer oil cementation.

Should try to avoid fabric wrinkles, if the laying of wrinkles (wrinkle height >2cm), should cut this part of the wrinkle, and then in the direction of laying and then put up, and with the adhesive layer oil handover.

4, when the geotextile is laid, after spraying the second asphalt viscous oil and cooling for about 2 hours, should be dropped in time for the appropriate amount of fine yellow sand, in order to prevent the vehicle through the geotextile, because the wheel sticky oil will be cloth brought up or destroyed, fine sand dosage of about 1~2kg/m2.

Third, asphalt surface construction 

1, asphalt surface construction methods and ordinary asphalt pavement surface construction methods, road structure and thickness design should be used "Highway asphalt Pavement Design Code" (JTJ014) or "Highway Maintenance Technical Specification" (JTJ073) provisions of the method.

The thickness of asphalt overlay is generally 4~6cm for old asphalt concrete pavement.

When paving asphalt mixture, the paving temperature must be strictly controlled!

The temperature is too high, the concrete is easy to burn out, the temperature is too low, affects the compaction degree.

2, Road compaction treatment The compaction degree of pavement is very important to the quality of pavement.The compaction degree of pavement is insufficient, there will be cracking, loosening, rutting and other phenomena, seriously affecting the service life of the road surface.

Forth. Construction Precautions

1, should try to avoid the vehicle on the geotextile turn or brake, especially when paving the asphalt surface, any sharp turn or car to glide may bring geotextile up or damage.

2, rain, humidity or cold weather conditions under the construction will affect the adhesion strength of the coating and cover effect. 

3, the laying process must be closed traffic.

With the exception of construction vehicles, other vehicles are allowed to pass through geotextiles only in emergency situations.

4, if the spread of hot mixed asphalt mixture in the paver skidding phenomenon, you can sprinkle a small amount of stone crumbs on the surface of the viscous layer oil.

In general, when we skillfully grasp the main points of geotextile construction, we can make it play a greater economic benefits, for our urban construction to make greater contributions.