What Is the Production Progress of Geotextile

Construction is a big project, during which the ground will be constantly polluted by debris falling from high places. However, after we cover the ground with geotextile, we can remove it and the ground is still clean as before, which saves the step of cleaning the ground. This also brings convenience to our work, so let's take a look at the production process of this geotextile.

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.

Geotextile Type

1. Needle-punched non-woven geotextile, the specifications are 100g/m2-1500g/m2, the main raw materials are polyester staple fiber or polypropylene staple fiber, made by needle-punching method, the main uses are: slope protection of river, sea, lake embankment, land reclamation, docks, ship locks and other projects, which is an effective way to achieve soil and water conservation and prevent pipe bursts through backfiltration.
2. Needle-punched non-woven fabric and PE film composite geotextile, the specifications are one cloth and one film, two cloths and one film, the main raw materials are polyester staple fiber needle-punched non-woven fabric, PE film is composited, the main use is anti-seepage, suitable for railways, highways, tunnels, subways, airports and other projects.
3. Non-woven and woven composite geotextile, the varieties are non-woven and polypropylene filament woven composite, non-woven and plastic woven composite, suitable for foundation reinforcement, adjustment of permeability coefficient of basic engineering facilities.
Non-woven geotextiles also include woven geotextiles, which have the characteristics of light weight, high strength, low elongation, good integrity, convenient construction, good reinforcement performance and low price.
According to the material, it can be divided into polyester geotextile and polypropylene geotextile; it can also be divided into filament geotextile and short filament (short fiber) geotextile
Short fiber geotextiles mainly include polyester short fiber needle-punched geotextile and polypropylene short fiber needle-punched geotextile, both of which are non-woven geotextiles. They are characterized by good flexibility, acid and alkali resistance, corrosion resistance, aging resistance, and convenient construction.
The width of filament woven geotextile is 1-7m, and the gram weight is 100-800g/㎡; it is made of high-strength polypropylene, polyester and other synthetic fiber filaments as raw materials, and is manufactured by special technology. It is wear-resistant, burst-resistant, and has high tensile strength. There is also a polyester filament singed geotextile (polyester filament singed geotextile) made by the method of polyester filament web forming and consolidation. Its advantages are a wide pore size range, tortuous void distribution, good permeability and filtration performance.

Functions of Geotextiles

1. When water flows from the fine soil layer to the coarse soil layer, the good air permeability and water permeability of the geotextile are used to allow the water to flow through, and effectively carry soil particles, fine sand, small stones, etc. to maintain the stability of water and soil engineering.

2. The geotextile has good water conductivity. It can form a drainage channel inside the soil to discharge excess liquid and gas in the soil structure.

3. When the water flow scours the soil, the geotextile effectively diffuses, transmits or decomposes the concentrated stress, prevents the soil from being damaged by external forces, and protects the soil.

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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