Do You Know The Construction Details of Geotextile?

Since the 1970s, geotextiles have been widely used in various fields such as roads, railways, water conservancy and port construction. The mass production and application of geotextiles have been generally regarded as an ideal engineering material that can improve engineering quality, speed up construction, reduce engineering costs and extend maintenance cycles. The following editor will introduce the construction details of geotextiles.

Old Road Surface Treatment

1. Remove dust, loose particles and debris from the old road surface, clean it up, and keep the surface dry. Shovel the sharp and abrupt parts of the road surface; for severely damaged and broken parts of the road surface, remove the broken parts and repair them with asphalt concrete. For roads with severe cracks or ruts, a 1-2 cm leveling layer needs to be paved.

2. Spread asphalt tack coat

When liquid petroleum asphalt is used as tack coat, the atmospheric temperature is above 5°C; when emulsified asphalt is used as tack coat, the atmospheric temperature is above 10°C. Do not sprinkle tack coat oil on rainy days and after rain when the road surface is wet. Pay attention to choosing the type and amount of tack coat oil. Practice has shown that it is best to use asphalt modified with EVA or SBS, which have good crack resistance and thermal stability. If emulsified asphalt is used, its asphalt content must be greater than 60% to be well utilized.

Before laying the geotextile, first sprinkle a layer of asphalt adhesive layer, the amount is about 0.4~0.6kg/m2, then lay the geotextile, and then sprinkle another layer of the same type of adhesive layer oil on the geotextile, the amount is about 0.5~0.6kg/m2. The following points should be noted: (1) It is recommended to use hot asphalt adhesive layer sleeves, and the oil temperature should be kept between 150 and 170℃; (2) The lateral range of spraying adhesive layer oil should be 5~10cm wider than the geotextile; (3) The adhesive layer oil should be sprayed evenly and the measurement should be accurate.

If one-time oiling is used, the total amount of adhesive layer oil cannot be reduced. The recommended value is 1.0~1.3kg/m2, and the oil temperature cannot be lower than 180℃. One-time oiling is prone to the geotextile not being soaked through and stratification, which leads to surface peeling.

Laying and Overlapping Of Geotextile

1. Geotextile is best to be mechanically erected, but it can also be manually laid. When laying, pay attention to let the rough side of the singeing face up, then fix one end with a fixture, tighten it mechanically or manually, and the tension elongation is about 1?0%~1?5%, and lay it straight and close to the road surface.

The fixture includes fixing nails and fixing iron sheets. The fixing nails should be cement nails or nails, with a length of 8~10cm; the fixing iron sheet can be a 1mm thick and 3mm wide iron sheet strip.

2. The geotextile is overlapped horizontally by about 4~5cm. According to the paving direction, the rear end is pressed under the front end, and it is bonded with hot asphalt or emulsified asphalt, and fixed with a fixture; the longitudinal overlap is also about 4~5cm, which can be directly bonded with adhesive oil. If the overlap is too wide, the interlayer at the overlap becomes thicker, and the bonding force between the surface layer and the base layer is weakened, which is easy to cause adverse effects such as bulging, detachment, and displacement of the surface layer. Therefore, the part with too wide overlap should be cut off.

3. Geotextiles should be laid in a straight line as much as possible. When turning is required, cut the curved part of the fabric, overlap and lay them and spray adhesive layer oil to bond them. Wrinkles should be avoided as much as possible. If wrinkles are generated during laying (wrinkle height>2cm), the wrinkles should be cut open, then overlapped in the laying direction and joined with adhesive layer oil.

4. When the geotextile is laid, spray the second layer of asphalt adhesive layer oil and cool for about 2 hours, sprinkle an appropriate amount of fine yellow sand in time to prevent the geotextile from being lifted or damaged by wheels due to oil sticking to the wheels when vehicles pass over it. The amount of fine sand is about 1-2kg/m2.

Asphalt Surface Construction

1. The construction method of asphalt surface layer is consistent with the construction method of ordinary asphalt pavement surface layer. The pavement structure and thickness design should adopt the method specified in the “Highway Asphalt Pavement Design Specification” (JTJ014) or “Highway Maintenance Technical Specification” (JTJ073). The thickness of the asphalt overlay layer is generally 4 to 6 cm for old asphalt concrete pavement.

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

If the temperature is too high, the concrete is easy to burn; if the temperature is too low, the compaction degree is affected.

2. Pavement compaction treatment

The pavement compaction degree is very important to the pavement quality. If the pavement compaction degree is insufficient, cracking, looseness, rutting and other phenomena will occur, which seriously affects the service life of the pavement.

Construction Precautions

1. Avoid turning or braking on the geotextile as much as possible, especially when paving the asphalt surface. Any sharp turn or braking may lift or damage the geotextile.

2. Construction under rainy, humid or cold weather conditions will affect the bonding strength and surface effect of the coating.

3. Traffic must be closed during the paving process. Except for construction vehicles, other vehicles are only allowed to pass through the geotextile in an emergency.

4. If the paver slips when paving hot-mix asphalt mixture, a small amount of stone chips can be sprinkled on the surface of the tack coat.

Conclusion

In general, only when we have mastered the construction points of geotextiles skillfully can we make it play a greater economic benefit and make greater contribution to our urban construction.

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