PP biaxial geogrids play a crucial role in enhancing the strength and stability of the road structure. They are typically installed within the road base or subgrade layers. The geogrids help distribute the load from traffic and prevent the development of cracks and deformations, thereby extending the lifespan of the road.

South Africa, being a country with a vast road network, faces various challenges such as heavy traffic loads, expansive soils, and harsh environmental conditions. PP biaxial geogrids address these challenges by providing reinforcement and stabilization to the road infrastructure.

PP biaxial geogrids are widely used in road reinforcement projects in South Africa. These biaxial geogrids are made from polypropylene (PP), a strong and durable polymer material. They are designed with a biaxial structure, meaning they have strength and reinforcement capabilities in both the longitudinal and transverse directions.

1 Case Study of  PP Biaxial Geogrid South Africa for Road Reinforcement Project

  • Location :South Africa
  • Product(s) : PP Biaxial Geogrid
  • Application: Road Reinforcement

2 Why Chose PP Biaxial Geogrid for Road Reinforcement Project in South Africa

When undertaking a road reinforcement project in South Africa, choosing PP biaxial geogrids proves to be an excellent solution. In these projects, the highway subgrade filling and excavation joint often experience uneven settlement, resulting in cracks and pavement issues. These problems have a negative impact on the road’s service life. Conventional methods like the open-step layered rolling technique may not effectively address the subsidence concerns at the joint section of high-fill roadbeds.

To overcome these challenges, the implementation of PP biaxial geogrids is highly recommended. These geogrids possess remarkable reinforcement properties, providing stability and strength in both longitudinal and transverse directions. By incorporating PP biaxial geogrids into the road reinforcement project, the load distribution across the road surface becomes more uniform, reducing stress concentrations and preventing premature failure.

PP biaxial geogrids enhance the bearing capacity of the road, enabling it to withstand heavier traffic loads. They effectively control crack formation and propagation, preserving the road’s integrity and minimizing the need for extensive maintenance. Moreover, these geogrids stabilize the subgrade soil, preventing lateral movement and improving overall road stability.

Given the diverse climatic conditions in South Africa, it is crucial to select PP biaxial geogrids known for their durability and resistance to environmental factors such as moisture, chemicals, and UV radiation. Consulting with geosynthetic experts and adhering to relevant design standards and guidelines will ensure the successful implementation of PP biaxial geogrids in road reinforcement projects in South Africa. Embracing this solution will effectively address settlement issues, prolong the road’s lifespan, and contribute to the development of robust and long-lasting road infrastructure.

3 Solution of PP Biaxial Geogrid South Africa for Road Reinforcement Project

The utilization of PP biaxial geogrids in road reinforcement projects in South Africa offers a reliable and effective solution. These geogrids are constructed through a stretching process, resulting in a square or rectangular polymer mesh. Depending on the stretching directions employed during manufacturing, they can be uniaxially or biaxially stretched.

To create the geogrid, holes are punched into the extruded polymer sheet, typically using materials like polypropylene or high-density polyethylene. The uniaxially stretched geogrid is formed by stretching the sheet along its length, while the PP biaxial geogrid undergoes additional stretching perpendicular to its length. The heating and stretching process during manufacturing rearranges and orients the polymer, enhancing the bonding force between molecular chains and thereby improving its strength.

To enhance the durability of the geogrid, additives such as carbon black are incorporated to provide resistance against aging, corrosion, acid, alkali, and other environmental factors. This ensures the geogrid’s long-term performance and ability to withstand the challenging conditions encountered in road reinforcement projects.

By implementing PP biaxial geogrids, road reinforcement projects in South Africa benefit from the geogrids’ high strength, load distribution capabilities, and resistance to various forms of deterioration. These geogrids effectively stabilize the road structure, prevent cracking and subsidence, and extend the service life of the road infrastructure.

The utilization of PP biaxial geogrids in road reinforcement projects in South Africa offers a solution to enhance road stability and durability. The stretching process during manufacturing strengthens the geogrid’s molecular bonds, while the incorporation of additives enhances its resistance to aging and environmental factors. By selecting PP biaxial geogrids, road reinforcement projects can achieve improved performance and longevity of the road infrastructure.

PP Biaxial Geogrid For Road Reinforcement Projects in South Africa
PP Biaxial Geogrid For Road Reinforcement Project in South Africa

3 PP Biaxial Geogrid For Road Reinforcement in South Africa

  • Total quantity – 95,600 square meters
  • Each roll size –  6m*50m

4 Features of PP biaxial Geogrid

  • Good flame retardant properties.
  • Friction is not easy to generate static electricity.
  • Easy to wash coal.
  • Strong anti-corrosion ability and anti-aging.
  • Easy to construct and transport. The plastic mesh is relatively soft, and it is not suitable for workers to be scratched during construction, and it has the advantages of easy curling and bundling, mining grid cutting and light weight, so it is convenient for underground transportation, carrying and construction.
  • Strong bearing capacity in both vertical and horizontal directions. Because the plastic mesh is biaxially stretched instead of woven, the mesh creep is small and the mesh size is uniform, which can effectively prevent the falling of broken coal and protect the safety of underground workers and the safety and security of underground workers.

5 The Role of Plastic Geogrid in Engineering

Plastic geogrids play a significant role in various engineering applications due to their unique characteristics and capabilities. Here are some key roles and benefits of plastic geogrids in engineering:

1) High Strength and Stability: Plastic geogrids exhibit high strength and minimal creep, making them suitable for use in tall retaining walls and high-grade highways. They can withstand heavy loads and provide stability to the foundation.

2) Improved Bearing Capacity: By enhancing the interlocking and occlusion of the reinforced bearing surface, plastic geogrids significantly increase the foundation’s bearing capacity. They effectively restrain lateral soil displacement and enhance overall foundation stability.

3) Durability and Convenience: Plastic geogrids offer advantages over traditional grids, including high strength, corrosion resistance, anti-aging properties, large friction coefficient, uniform hole distribution, easy construction, and long service life.

4) Seawater Resistance: Plastic geogrids are particularly suitable for deep-sea operations and embankment reinforcement, addressing the challenges posed by long-term seawater erosion. They overcome the issues of low strength, poor corrosion resistance, and short service life associated with gabions made from other materials.

5) Construction Damage Prevention: Plastic geogrids can prevent construction damage caused by machine rolling and damage during the construction process. Their robustness and resistance to mechanical stress contribute to a smoother construction operation.

6) Roadbed Reinforcement: Plastic geogrids are suitable for reinforcing the roadbeds of highways, railways, and airports, improving stability and load-bearing capacity.

7) Foundation Reinforcement: They are well-suited for reinforcing foundations subjected to permanent loads, such as large parking lots and wharf freight yards, ensuring long-term stability and durability.

8) Slope Protection: Plastic geogrids are effective in slope protection for railways and highways. They prevent soil erosion and maintain slope integrity.

9) Secondary Soil Slope Reinforcement: Plastic geogrids can be used to reinforce soil slopes previously reinforced with one-way tensile geogrids. This secondary reinforcement further strengthens the slope and enhances erosion prevention.

Plastic geogrids offer multiple benefits in engineering applications. Their high strength, stability, durability, and resistance to various environmental factors make them valuable for a wide range of projects, including retaining walls, foundation reinforcement, slope protection, and roadbed stabilization.

6 Construction Points of PP Biaixal Geogrid

  1. Construction site: It is required to be compacted, level and level, and the spikes and protrusions should be removed.
  2. Grille laying: On a flat and compacted site, the main force direction of the installed grille: the longitudinal direction should be perpendicular to the axis of the embankment, and the laying should be flat, without wrinkles, and as tight as possible. It should be fixed by inserting nails and earth-rock weight. The main stress direction of the grid should be full length without joints. The connection between the panels can be manually tied and overlapped, and the width of the overlap is not less than 10cm. If there are more than two layers of grilles, the layers should be staggered. After a large area is laid, the straightness should be adjusted as a whole. After filling a layer of soil, before rolling, the grille should be tightened manually or with equipment again, and the force should be uniform, so that the grille is in a state of tension and stress in the soil.
  3. Selection of filler: The filler should be selected according to the design requirements. Practice has proved that except frozen soil, swamp soil, domestic garbage, chalk soil, diatomaceous earth can be used as filler. However, gravel soil and sand soil have stable mechanical properties and are less affected by water content, so they should be preferred. The particle size of the filler should not be greater than 15cm, and the gradation of the filler should be controlled to ensure the compaction weight.
  4. Paving and compaction of filler: After the grid is laid and positioned, it should be filled with soil and covered in time. The exposure time should not exceed 48 hours. The flow operation method of backfilling while laying can also be adopted. First spread the filler on both ends, fix the grille, and then push it to the middle. The order of rolling is first on both sides and then in the middle. When rolling, the pressure roller cannot directly contact the reinforcement, and the uncompacted reinforced body generally does not allow vehicles to drive on it, so as to avoid the dislocation of the reinforcement. The layered compaction is 20-30cm. The degree of compaction must meet the design requirements, which is also the key to the success of reinforced soil engineering.
  5. Waterproof and drainage measures: In reinforced soil engineering, the drainage treatment inside and outside the wall must be done well, foot protection, anti-scour, and filtering and drainage measures should be set in the soil body. If necessary, geotextile, Permeable pipe  or blind ditch. Drain the water by means of dredging, and can not be blocked, otherwise there will be hidden dangers.

7 Summary

Geogrid is made of high-density polyethylene as raw material, which is plasticized and extruded, punched, heated and stretched. By stretching, the originally scattered chain-shaped molecules are redirected to a linear state, which fully improves the tensile strength and rigidity of the geogrid. When the geogrid is laid in the soil, it can form a strong stress transmission mechanism through the occlusion and interlocking between the grid mesh and the soil, which can quickly and effectively disperse the local load into a large area of soil, thereby reducing the local load. Destruction stress, improve the service life of the project.

The characteristics of geogrid are high strength, low elongation, high temperature resistance, and it can be used at the joint of highway asphalt paving layer and subgrade, which can strengthen and reinforce the road surface, prevent road cracks and reflection cracks, and can well protect the road surface. The load-bearing stress is dispersed and the service life of the road surface is prolonged. Geogrid can be used for the maintenance of cement pavement and airport runway.

BPM has been specializing in delivering one stop geosynthetics products and solutions to worldwide customers since its foundation in 2007. BPM had provided many types of effective and state of the art geomembranes, geotextiles, geocells, geosynthetic clay liners (GCLs), drainage boards, geogrids to over 81 countries.

BPM is not only manufacturing best quality geosynthetic products but also providing professional design and installation service. OEM, ODM, custom development and fabrication are also available. If you have any questions or inquiries,  please contact us, we will reply as soon as possible.

PP Biaxial Geogrid For Road Reinforcement in South Africa
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