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Lianyi®PET welded geogrid (polyester welded geogrid)is a kind of geosynthetic material with a mesh structure made mainly of polyethylene terephthalate (PET) through high-frequency welding or ultrasonic welding processes. It features high strength, corrosion resistance, fatigue resistance and other characteristics, and is widely used in engineering fields such as roadbed reinforcement, slope protection and soft foundation treatment.
Features Of PET Welded Geogrid
*High strength: It has a high tensile strength (up to 30 to 200kN/m), which can effectively disperse the load and prevent soil cracking.
*Low elongation: Small deformation under force (generally ≤8%), suitable for projects with strict deformation requirements.
*Corrosion resistance: PET material is resistant to acid, alkali, salt and microbial erosion, and is suitable for complex geological environments.
*Anti-aging: Add UV inhibitors to extend outdoor service life.
*Lightweight and easy to install: It is lighter than steel-plastic grating and has a higher laying efficiency.
*Environmentally friendly and recyclable: PET materials can be partially recycled and reused, in line with the trend of green engineering.
Common Types Of PET Welded Geogrid
The longitudinal (main force direction) strength is high, while the transverse strength is relatively low.
It is applicable to unidirectional force-bearing projects such as retaining walls and steep slope reinforcement.
The strength is balanced in both longitudinal and transverse directions, making it suitable for scenarios that require uniform force distribution, such as roadbeds and soft foundation treatment.
*Woven PET geogrid (non-welded type)
It adopts weaving technology, has better flexibility and is suitable for irregular terrain.
Application Of PET Welded Geogrid
*Reinforcement of highway/railway subgrades
*Reduce settlement, prevent reflective cracks and extend the service life of roads.
*Slope protection and reinforcement
*Enhance the anti-sliding capacity of soil and prevent landslides.
*Soft soil foundation treatment
*It forms a composite layer with the soil to enhance the bearing capacity.
*Airport runways, port storage yards
*Distribute the load to prevent ground cracking.
*Landfill sites, tailings ponds
*As a reinforcing layer, it enhances stability.
Key points of Construction
*Base treatment
Clear sharp objects and level the ground to prevent the geogrid from being punctured.
*Laying direction
The main strength direction (unidirectional geogrid) should be perpendicular to the force direction (such as slope).
*Lap joint and fixation
The lap width should be no less than 10cm and be fixed with U-shaped nails or binding.
*Filling and compaction
Fill the soil in layers to avoid direct mechanical compaction of the grid.
Notes
*Avoid prolonged exposure to ultraviolet rays and cover when storing.
*Avoid direct mechanical rolling during construction to prevent the welding points from breaking.
*Select the appropriate strength grade to ensure the safety of the project.
PET welded geogrids,with their advantages of high strength,corrosion resistance and easy construction, have become important materials in modern geotechnical engineering, especially suitable for projects with high requirements for weight and environmental protection.
Keywords：
1.Welded Geogrid
What‘s Steel Plastic Composite Geogrid ?
Lianyi®Steel Plastic Composite Geogrid is a kind of high-strength geosynthetic material, which is made by combining high-strength Steel wire with polyethylene (PE) or polypropylene (PP), and it combines the mechanical properties of metal with the corrosion resistance of polymer.
Features Of Steel Plastic Composite Geogrid
*High strength: The steel wire core offers extremely high tensile strength (up to over 100kN/m), making it suitable for withstanding heavy loads.
*Mesh size: 50*50mm,60*60mm,75*75mm,100*100mm,120*120mm,150*150mm
*Corrosion resistance: The plastic coating protects the steel wire from the erosion of acids, alkalis, salts and groundwater, thus extending its service life.
*Small deformation: Low elongation (generally ≤3%), which can effectively restrain soil deformation and improve structural stability.
*Good durability: Stable performance in complex environments (such as humidity and ultraviolet rays), with a long service life.
*Lightweight and easy to install: Light in weight, convenient to cut, and highly efficient in laying.
Advantages Of Steel Plastic Composite Geogrid
*The ultra-high tensile strength can reach 30 to 150 kN/m (much higher than that of plastic geogrid), and it is used in heavy-duty engineering.
*The deformation rate of the low creep steel wire core material is less than 3% (almost no deformation under long-term loading).
*The corrosion-resistant plastic layer isolates water/oxygen/chemical media, with a design life of ≥50 years (applicable to saline-alkali land and landfill sites).
*The large interfacial friction coefficient, rough surface structure, enhanced interlocking force with soil (friction Angle > 25°).
*Flexible rolls (1 to 6 meters wide) with convenient construction can be cut on site and have high laying efficiency.
Application Of Steel Plastic Composite Geogrid
*Highway/railway subgrade: Distribute loads, prevent uneven settlement, and reduce cracks.
*Slope protection: Enhance the anti-sliding capacity of soil, such as embankments and mine slopes.
*Soft soil foundation treatment: Form a composite layer with soil to enhance bearing capacity.
*Reinforcement of retaining walls: Reduce lateral pressure and enhance the integrity of the structure.
*Airport and port storage yards: Prevent ground cracking and extend service life.
Frequently Asked Questions
Q: Will steel plastic composite geogrid rust?
The steel wire is completely sealed with plastic and has passed the 4,000-hour salt spray test (ASTM B117). In actual engineering, no corrosion failure has been observed for 50 years.
Q: Can it replace steel mesh?
Sure! In reinforced soil structures, its tensile strength is equivalent to Φ16@100mm steel mesh, but its weight is only 1/10, and the construction speed is increased by 3 times.
Q: Precautions for winter construction?
When the temperature is less than 5℃ :
Disabled! The brittleness of plastic increases, and it is prone to breakage during laying.
When storing, the rolls should be placed vertically to prevent freezing and sticking between layers.
Purchase suggestions
*Verify the test report of GB/T 21825-2008 (national standard) or ASTM D6637 (American standard);
*The key inspection points are the peel strength of the nodes (which should be greater than the tensile strength of the steel strands) and the carbon black content (≥2% UV resistance).
Ultimate advantage: Increase the bearing capacity of the foundation by 300% at a cost of 10%, making it the king of cost performance for soft soil, steep slopes,and heavy-load projects!
Keywords：
- Material and Structure
*Raw materials
Fiberglass Geogrid: Glass fiber (inorganic material, mainly composed of silicate)
Polyester Geogrid: Polyester fiber (PET, organic polymer)
*Production process
Fiberglass Geogrid: Glass fibers are woven and then impregnated with asphalt or polymer coatings
Polyester Geogrid: High-strength polyester yarns can be warp knitted or welded into grids, and the surface can be covered with polymers
*Physical properties
Fiberglass Geogrid has high rigidity and great brittleness, and is not easy to bend
Polyester Geogrid has good flexibility and strong elasticity, and can adapt to deformation
- Key performance comparison
*Tensile Strength
Fiberglass Geogrid: 30kN/m-300kN/m
Polyester Geogrid: 20kN/m-1000kN/m
*Elongation
Fiberglass Geogrid has an extremely low elongation rate (≤3%), almost no elasticity
Polyester Geogrid is relatively high (13% – 15%), capable of absorbing deformation energy
*High-temperature resistance
Fiberglass Geogrid: excellent (Long-term temperature resistance >200℃)
Polyester Geogrid: average (softening point 230℃, long-term service ≤100℃)
*Acid and alkali resistance
Fiberglass Geogrid: resistant to strong acids and strong alkalis (stable glass composition)
Polyester Geogrid:resistant to weak acids and alkalis,but prone to hydrolysis in strong acid and alkali environments
*Creep resistance
Fiberglass Geogrid: average (prone to brittle fracture under long-term load)
Polyester Geogrid: excellent (strong resistance to long-term deformation)
*UV resistance
Fiberglass Geogrid relies on coating protection (prone to aging after damage)
Polyester Geogrid has excellent performance (with UV absorber added, long service life).
*Low fatigue resistance
Fiberglass Geogrid: low (prone to breakage under repeated loads)
Polyester Geogrid: high (flexible and resistant to dynamic loads)
3. Applicable scenarios
(1)The advantageous scenarios of fiberglass geogrid
*Asphalt pavement crack resistance
It is laid between asphalt layers to suppress reflective cracks by using high modulus (such as adding asphalt to old cement roads).
*High-temperature construction
The performance of hot-mixed asphalt laying is stable at 140-160℃.
*Reinforcement of rigid structures
Airport runways, concrete pavements and other projects that require high-rigidity supports.
(2)The advantageous scenarios of polyester geogrid
*Soft soil foundation reinforcement
Flexible adaptation to foundation deformation and reduction of settlement (for highway/railway subgrades and DAMS).
*Slope and retaining wall
High elongation disperses soil stress and prevents landslides.
*Long-term load-bearing project
It has strong creep resistance and is suitable for structures with high fill soil (such as landfill slopes).
4.Typical engineering cases
After the renovation of the old expressway (Shanghai-Nanjing Expressway), the reflective cracks were reduced by 80% after the asphalt layer was added.
Deep-sea soft foundation treatment (artificial island of Hong Kong-Zhuhai-Macao Bridge), controlling settlement and enhancing the stability of the roadbed.
5.A one-sentence summary
*Fiberglass geogrid: High strength, crack resistance, high temperature resistance, suitable for asphalt pavement and rigid structure.
*Polyester geogrid:Flexible, creep-resistant, corrosion-resistant, suitable for soft foundation reinforcement and long-term engineering.
6.Pitfall Avoidance tips
*Fiberglass geogrid may become brittle due to “alkali precipitation” in a damp and alkaline environment, so an alkali-resistant coating model should be selected.
*Anti-corrosion layers need to be added to polyester geogrid in strong acid (such as pH<3) and strong alkali (such as pH>11) soils.
keywords:
- Key performance comparison
*Manufacturing Process
Non Woven Geotextile:Fibers bonded mechanically (needle-punched), thermally, or chemically.
Woven Geotextile:Fibers woven together (like fabric) on looms.
*Structure
Non Woven Geotextile:Random fiber orientation (felt-like).
Woven Geotextile:Grid-like pattern (warp + weft yarns).
*Primary Function
Non Woven Geotextile:Separation, Filtration, Drainage.
Woven Geotextile:Reinforcement, Stabilization.
*Tensile strength
Non Woven Geotextile:Lower tensile strength, isotropic (similar strength in all directions).
Woven Geotextile:High tensile strength, anisotropic (stronger in machine direction).
*Permeability
Non Woven Geotextile:High (water flows easily through pores).
Woven Geotextile:Low to moderate (dense weave restricts flow).
*Filtration Efficiency
Non Woven Geotextile:Excellent (retains soil while allowing water passage).
Woven Geotextile:Good, but prone to clogging in fine soils.
*Elongation
Non Woven Geotextile:High (stretches more under load).
Woven Geotextile:Low (minimal stretch).
2.Key Properties & Performance
*Hydraulic Behavior (Water Flow):
Non Woven Geotextile: High permeability → Ideal for drainage (e.g., behind retaining walls, under roads).
Woven Geotextile: Lower permeability → Better for erosion control but may require careful soil compatibility.
*Mechanical Strength:
Non Woven Geotextile: Good puncture resistance but lower load capacity → Used for cushioning/protection (e.g., under geomembranes).
Woven Geotextile: High tensile strength → Perfect for soil reinforcement (e.g., steep slopes, embankments).
*Filtration & Soil Retention:
Non Woven Geotextile: Random pores trap soil particles while allowing water → Superior for filtration (e.g., landfill leachate systems).
Woven Geotextile: Uniform pores may clog with fine silts → Requires proper opening size (AOS) selection.
*Durability:
Non Woven Geotetxile are both resist UV/chemical degradation (if made from polypropylene/polyester).
Woven geotextile generally has higher abrasion resistance.
3.Typical Applications
*Road Construction
Non Woven Geotextile : Separation layer between subsoil/aggregate
Woven Geotextile : Base reinforcement for weak subgrades.
*Drainage Systems
Non Woven Geotextile : Wrap for perforated pipes, French drains.
Woven Geotextile : Limited (low permeability).
*Erosion Control
Non Woven Geotextile : Under riprap/armor layers.
Woven Geotextile: Slope stabilization, silt fences.
*Landfills
Non Woven Geotextile: Protection layer for liners, leachate collection.
Woven Geotextile: Reinforcement of cover systems.
*Railway Ballast
Non Woven Geotextile:Separation/filtration beneath tracks.
Woven Geotextile: Trackbed stabilization.
4.How to Choose?
You need drainage, filtration, or separation (e.g., under driveways, behind retaining walls, pond liners).
You need high strength and stabilization (e.g., reinforcing soft soils, building access roads over mud).
*Hybrid Tip: Some projects use both! For example:
Non woven geotextile for drainage + woven geotextile for reinforcement in steep slopes.
5.Quick Reference
Pros Cons
✅ Excellent filtration/drainage ❌ Lower tensile strength
✅ Conforms to uneven surfaces ❌ Prone to creep under sustained load
✅ Cost-effective
Pros Cons
✅ High load capacity ❌ Poor filtration in fine soils
✅ Low elongation ❌ Stiff (harder to install on curves)
✅ Superior abrasion resistance
6.Summary:
Non woven geotextile:Drainage/Filter (water-centric).
Woven geotextile: Reinforcement (strength-centric).
What’s Asphalt Geogrid ?
Lianyi®Asphalt Geogrid is available in two versions,both for road asphalt reinforcement.First option is fiberglass geogrid and self-adhesive fiberglass geogrid.The second option is a geocomposite made by fiberglass geogrid glued or stitched with PET non woven geotextile or PP non woven geotextile which increase the contact surface original layer. Asphalt geogrid is the best solution to solve asphalt pavement cracking and repair asphalt pavement.
Classification Of Asphlat Geogrid
*Self- Adhesive Fiberglass Geogrid
*Fiberglass Geogrid Composite With Nonwoven Geotextile
*Fiberglass Geogrid Stitched With Nonwoven Geotextile
*Reinforcement of asphalt pavement
Fiberglass Geogrid is used to pave roads considerably reduce the reflective cracking on the course,decrease crack propagation speed,control the formation of ruts and lessen the internal stresses caused by temperature changes.Fiberglass Geogrid for asphalt reinforcement are ideal to improve the performances of roads superstructure,thus allowing them to meet the design requirements.Additionally,these fiberglass geogrid improve loads distribution on the wearing course and thus reduce the settlements.
*Protection from Reflective Cracks
The use of asphalt fiberglass geogrid in asphaltic pavement system mitigates the risk of reflective crack formation.The fiberglass geocomposite reinforcement layer redistributes stresses horizontally in the overall system,thus preventing stress from concentrating and migrating upward to the surface as a crack.
*Prevention of wheel track rutting
The high strength performance of the materials redistributes loads across the entire area of the reinforced road surface.This prevents the formation of wheel ruts,even in high temperature environments.
Benefits Of Asphlat Geogrid
*Safer roads
*Greater roadway service life
*Thinner asphalt layers with no loss of performance
*Reduced costs in construction and long term maintenances
*Stronger base cause
Applications Of Asphlat Geogrid
*Asphalt concrete pavement
*Asphalt layer
*Rehabilitation of old asphalt roads
Lianyi®PP geogrid composite is a composite material made by combining PP geogrid (such as Biaxial geogrid made of PP,Fiberglass or Polyester)with non woven geotextile (such as polyester non woven geotextile or pp non woven geotextile through thermal lamination or adhesive bonding processes.It combines the advantages of two materials and is widely used in civil engineering,environmental engineering and other fields.
Classification Of PP Geogrid Composite
*PP Geogrid Composite With Non Woven Geotextile
Features Of PP Geogrid Composite
*High strength and tensile resistance
PP geogrid offers high tensile strength, effectively disperses loads and reduces uneven settlement of the foundation.
*Filtration and drainage
The non woven geotextile layer allows water to pass through while preventing the loss of soil particles, and it also has a drainage function.
*Anti-seepage and isolation
Some composite fabrics can be added with anti-seepage membranes (such as HDPE geomembranes for anti-seepage projects (such as landfill sites).
*Corrosion resistance and durability
Acid and alkali resistant, UV-resistant, suitable for long-term exposure or underground use.
Benefits Of PP Geogrid Composite (
*Distribution of loads and therefore reducing stress concentration over the soil.
*The geogrid’s structural junctions,rigid ribs and thick walls help lock aggregate,increasing its shear resistance. As a result when a vertical load is applied,the aggregate is restrained by the ribs reducing deformation.
*Decrease in long term deformation.
*Increase in load distribution.
Applications Of PP Geogrid Composite
*Highway/railway subgrade
*Enhance the stability of the roadbed and prevent reflective cracks.
*Slope protection
*Fix the soil in combination with vegetation to prevent landslides.
*Landfill
*Anti-seepage composite fabric is used as a cushion layer to prevent the spread of pollution.
*River course improvement
*Protect the bank slope and resist the erosion of water flow.
PP Geogrid Composite Key Points of Construction
*Laying direction: The high-strength direction of the grid must be consistent with the force direction.
*Lap treatment: The transverse lap of the grating should be no less than 10cm, and the longitudinal lap should be no less than 20cm. Geotextile lap joints need to be sewn or bonded.
*Protective layer: Avoid direct exposure to ultraviolet rays and cover the fill soil in time.
Purchase suggestions Of PP Geogrid Composite
*Select parameters such as tensile strength (e.g., above 30kN/m) and permeability coefficient (e.g., ≥0.1cm/s) according to engineering requirements.
*Give priority to well-known brands (such as Lianyi-www.geolianyi.com) to ensure quality.
