What is Geogrid used for?
Geogrid is an extruded synthetic mesh that is typically used in civil construction projects across Australia and New Zealand. It is designed to provide long term ground reinforcement in an efficient manner by stabilising the rock fill particles that are used as a sub-base layer under roads and pavements.
Made from polypropylene or polyethylene, geogrids are sold by the roll offering a lightweight and easy to handle way to cover large areas efficiently. The plastic construction has been stress-tested under a number of different Australian Standards tests, proving it to be extremely strong and reliable for many years.
Additionally, because geogrid is a geosynthetic material made from polymers like polypropylene, it will not react with moisture or microorganisms in the soil, meaning it is resistant to degradation.
Typical uses for geogrid
Geogrid is designed with an intertwined mesh structure which holds particles and rocks, enabling it to form a strong bond with soil and aggregate mixes. Because of this inherent strength, geogrid is ideal for use as:
The reinforcement of base and subgrades
Road construction, both paved and unpaved
The reinforcement of slopes and embankments
How does geogrid provide reinforcement?
Geogrids work by forming a strong, resilient structure of polymer fibres that becomes interwoven with the soil or granular material placed over them. The open-aperture design of geogrids allows the rock or fill material to be held fast within the grid, dramatically increasing the strength of the layer.
There are two types of geogrids available from GEOmasta – biaxial and uniaxial.
These geogrids provide equal support and equal strength in two directions or planes (for example, north-south plus east-west).
Uniaxial geogrids have uni-directional strength; that is, their strength and support operate along one direction.
How do geogrids save time and money on site?
Traditionally, reinforcing soil has been a costly and time-consuming process, however, geogrid offers a fast and cost-effective solution. Your team can literally roll out geogrid by the metre, offering immediate savings in time and effort.
Geogrid also helps to the thickness of the granular base that is required, providing even more cost savings.
Not only do geogrids add significant tensile strength to soils, but the use of high-strength polyester fibres which are purpose-engineered makes them suitable for all normally occurring soil types and gives them decades of design life.
Nine industries that can benefit from geogrids
The construction of roads and pavements or the repair of ageing ones require specific attention to be paid to temperature variations, stress and load-bearing, vehicle traffic loading, fatigue and water ingress.
By using geogrids, engineers can reduce the thickness of capping layers by half compared with a standard un-stabilised design, and this is without any loss of performance. A contractor can save significant expenses on ground improvement work because of the reduction – up to 30% – in layer thickness.
Road renewal, especially full-depth reconstruction, is a costly business. The employment of a geogrid layer has been proven to increase the life-span of the road pavement by more than three times, thereby reducing annual maintenance budgets by over 50%.
Heavy load access roads
The bearing capacity of weak subgrades can be increased by using geogrids, when necessary, to construct access roads for very heavy loads. For example, constructing access for cranes needed for the installation of wind farms where the bearing capacity of a road has to be able to withstand unusually heavy loads across typically weak soil substrates.
Retaining walls and slopes
Uniaxial geogrids are ideal for the construction of soil slopes and retaining walls. They provide reinforcement by containing lateral earth pressure and spreading the load. In retaining wall systems, uniaxial geogrids are ideal for the reinforcement of soil mass. Geogrids are designed to link with a number of different block systems, steel mesh panels and concrete panels to form a super-strength retaining wall. They can also be used for wrap-around facings.
Slopes and slip repairs
Geogrid technology means that slopes of any angle can be constructed using a variety of fills. This is a quick, cost-effective means of constructing embankments and slip repairs that need to tackle a steep face angle.
Capping tailings and industrial waste deposits
What was once considered almost impossible has now become a manageable challenge, thanks to geogrids. Engineers have been able to develop techniques utilising geogrids to cap weak deposits, making geogrids the industry standard for such challenges today.
On railway projects, geogrids stabilise the rail ballast and trackbed and improve bearing capacity. They also significantly reduce any movement of rail ballast, meaning that less maintenance will be required over the railway line’s lifetime.
Airports and heavy-duty pavements
Multiple layers of geogrids form a stiff platform that spreads heavy loads across a large area and reduces unequal settlement and cracking. In some situations, several layers of geogrids are required, particularly where soft ground is prevalent.
Shop for GEOmasta geogrid
Choosing a geogrid from GEOmasta can help you save time, money and even CO2 emissions. Geogrids such as our mastaGRID range promise long-term stability and significant reductions in maintenance costs for your project.