Now picture yourself stepping onto a brand-new roadway that appears to be immaculately paved until cracks appear just a few months later. The gap between such an undesirable scenario and the one where a pavement remains structurally sound for years is made possible by following one vital procedure in the paving process. That procedure entails correctly installing a biaxial geogrid, which is basically a form of geosynthetic that strengthens the subgrade and ensures even loading.

In this article, I'll shed light on the best practices for installing biaxial geogrids based on what contractors and engineers do out in the field. Here you'll get to know precisely how to set up the location, work with the geogrid, roll out your biaxial geogrid, deal with overlap and compaction. These tips will help you derive maximum benefit from biaxial geogrid.

Installation Techniques Are Paramount for Biaxial Geogrid Functioning

Mechanical interlocking is achieved through the open apertures in the geogrid with fill materials that prevent vertical displacement by transferring load distribution laterally. The effectiveness of this principle relies heavily on proper installation of the material, as substandard installation may decrease performance by up to 40%. It is essential to avoid any errors during the process to prevent wasting money.

The tension in the grid should be evenly distributed throughout the material. Loose spots cause stress concentrations, and insufficient overlapping results in inadequate interlocking. Overlapping beyond necessary levels will make the material too thick in certain sections. No matter how good a material is and whatever reputation a Geogrid manufacturer Gujarat has, the installation methods will impact the efficiency of the material's functioning.

Preparation of Subgrade Before the Placement of Biaxial Geogrid

1. Surface Preparation

Before installing the geogrid, the subgrade needs to be levelled and cleared of all debris or any sharp objects that could lead to tears in the geogrid. All vegetation and their remnants need to be cleared since there is a possibility that they could decay at a later stage and cause void spaces within the structure. The surface should be prepared to the required grade and crown where necessary.

2. Compaction to the Required Density

Once the subgrade has been prepared, it should be compacted to the required density before placing the geogrids. It is important to note that the surface should be sufficiently stiff to hold the construction equipment and not be prone to rutting. However, it shouldn’t be so firm as to make the formation difficult during placement of the geogrid.

3. Checking the Moisture Content

This is very important since moisture greatly influences compaction properties. The optimum moisture content should be attained while still considering proper drainage. There should be no more than 5% fines of less than 0.063mm.

Proper Handling and Storage Instructions for Biaxial Geogrid

1. Storage of Rolls Until Installation

Biaxial geogrid rolls should be kept in their original packages until needed. They must be stored away from direct sunlight on level and dry surfaces. Polymer materials degrade when exposed to the UV rays, which means that biaxial geogrid should preferably be stored under cover for several days after unloading.

2. Careful Transportation of Rolls

While transporting the rolls from storage to installation site, avoid any scraping and dragging along uneven surfaces. Forklifts with wide forks should be used for transport. If the rolls have damaged packaging, they should be checked carefully prior to installation.

3. Careful Unrolling without Damage

Rolls should be unrolled slowly following the prepared subgrade surface, not forced onto a particular spot. The material must not stretch as its elasticity has an important role in the effectiveness of biaxial geogrid installation. Ribs should go in a planned direction according to project design specifications.

Biaxial Geogrid Installation Procedures Step by Step

1. Ensure Correct Positioning of the First Roll

The initial stage should be attaching the start of the roll to the center point as well as corners of the area. For this purpose, a variety of materials such as fill aggregate piles, washer pins, or U-staples should be applied and driven into the ground, thus capturing the apertures and keeping the material in place.

2. Ensure Tension During the Unrolling Process

When unrolling, some tension needs to be applied to reduce wrinkling and slack. The installation of geogrid sheets should be smooth without creases or folds over the entire surface. In case it is required, the material can be weighted manually with the help of packing in order to secure the sheet against slipping on slopes or moving due to wind.

3. Prevent the Material from Moving While Installing

Overlap edges and ends should be fixed with the help of MS rods or wooden pegs. These pegs should be placed every three to four meters along two directions of the grid. At the same time, the end of the geogrid material should be hand-tightened and fixed to the formation before filling in.

Adding and Compacting Fill Material Above Biaxial Geogrid

1. Add Fill Material Gently

Transport the required soil or aggregate and pour it slowly onto the laid geogrid layer. Movement of any vehicle on top of the exposed geogrid is not advisable unless it is when adding fill material in its initial stage. The thickness of the first layer must be between 20 cm and 30 cm before exposing the surface to traffic.

2. Fill Material Placement Technique

Place fill material above the geogrid using the front-spread approach in order to prevent dragging or displacement of the geogrid material. Move the material towards you from the backside of the grid.

Method for Compactness and Optimum Functioning

Compact the base with the specified thickness using suitable earthwork machinery. Begin compaction from the middle part of the structure and move outwards towards the edge to utilize reinforcement right away. Initial static rolling combined with dynamic rolling has been found advantageous in the majority of cases.

1. Optimal Water Content Prior to Compaction

The water content in the supporting layer should be brought to its optimal level prior to compaction since high levels of moisture can cause the material to crumble under the pressure of rollers, whereas low water content fails to produce optimal density.

2. Checking Quality of Compaction

When you compact the first layer of material, riding over the installed and compacted supporting layer will enable you to test the load-carrying capacity of this material. Measure the deformation of the surface due to the passage of wheel loads and the depths of tracks left by these wheels.

Acquiring High-Quality Biaxial Geogrid from Reliable Suppliers

The quality of the product is just as important as the quality of work that goes into its installation. When you deal with a trusted Biaxial geogrid factory India, you can be sure that the products will conform to global standards when it comes to tensile strength and aperture.

For customers in western India, a manufacturer can provide them with geogrids that are specially formulated for their region. This is because manufacturers in this region are aware of the unique soil characteristics found here, as well as the extreme weather that occurs during monsoon season.

Conclusion

Proper installation of biaxial geogrid means the difference between having pavements last for decades or failing after a few months. Best practice installation of biaxial geogrid involves all the crucial procedures from subgrade preparation to compaction.

Clearing the surface properly, ensuring proper compaction of subbase material, unrolling the geogrid without causing any wrinkles, using appropriate overlap width, placing the fill carefully and compaction all help reinforce the geogrids optimally.

If done right, all these best practices ensure the benefits of improved bearing strength and reduced settlement of pavement as well as improved longevity.

FAQs

1. How long should biaxial geogrid last before covering?

Cover the biaxial geogrid within 7 to 10 days after its installation. UV exposure may degrade the performance of polymers in biaxial geogrid.

2. Who is the largest exporter of biaxial geogrid?

India is a big contributor to the exports of the biaxial geogrid. In India, Singhal Industries Pvt Ltd is the most famous exporter of high-quality geogrid materials at affordable prices.

3. Can I use biaxial geogrid on slopes?

Yes, till 18 degrees (3:1). Add anchorage using stakes or pins and compact from bottom to top to prevent sliding.

4. How does biaxial geogrid differ from uniaxial geogrid?

Biaxial geogrid provides strength in both directions while uniaxial provides more strength in one direction.

5. How can I determine if the installation of biaxial geogrid was successful?

There should be even track depths without any signs of deformation by load or pumping during compaction.