Biaxial Geogrids
Soil reinforcement for road stabilization
Biaxial geogrids are used mostly for reinforcement purposes in soil stabilization applications their symmetric-multiaxial structure can increase the bearing capacity of the existing subsoil providing the necessary strength and confinement effect. The tensile strength and the geometry of these geogrids are normally symmetric with tensile strengths from 20 to 300 (or even more) kN/m but three or more axis versions are available; also the polymer and the opening shapes can vary according to the tensile requirements and the fill properties.
Maccaferri’s range includes different families of products:
MacGrid EG
Extruded polypropylene geogrids with a symmetric tensile strength of up to 50 kN/m; successfully used in single or multiple layers for many decades in soil stabilization applications is an essential component of many combo-solving solutions.
MacGrid EG-T
Again an extruded polypropylene geogrid but characterized by a triangular shape to have a multi-axial behaviour. These materials are used – as the MG EG – in the same type of applications and are supposed to be an evolution of the biaxial ones.
MacGrid WG-S
High tenacity PET knitted-weaved coated geogrids are also available and used in these types of applications especially when the tensile strength requested exceeds the capacity offered by the extruded ranges; these products are available up to standard symmetric strength of 300kN/m but – on demand – can be proposed up to 1000 kN/m.
Success Stories
Built, not just drawn
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BASE COURSE (ROAD) REINFORCEMENT
United States
Highway 6 north out of Houston was designated as one of the evacuation routes out of the city in the event of natural disasters. The width of the highway was being expanded to accommodate hurricane evacuation for Houston area resi-dents. Due to the potential large number of vehicles and large size of vehicles (i. e. buses and other large transpor-tation vehicles) the roadway needed to be both large in lane numbers and strong. The sub-base and base course design has a major impact on the strength and functionality of the road. TXDoT needed a cost effective and practical way to solve this problem.
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NTPC SIDING-GADARWARA PROJECT– BLANKET THICKNESS REDUCTION
The Gadarwara railway station is approx. 20 km from NTPC site. NTPC constructed the Gadarwara railway siding line for transporting coal to their plant. For this railway siding work, the blanket (subballast) material was not available in the Gadrwara area and transportation of blanket material from outside area was not an economical option. This devoid of blanket material was major concern of project. Also, mining has been banned in our country due to environmental issues, so it had become difficult to get quantity for blanket for formation construction. Apart from unavailability of blanketing material, another concern of this project was the inadequacy of good subgrade material. The subgrade material was of SQ1 type which had fines content of more than 50%. Considering these aspects of project, biaxial extruded polypropylene geogrid MacGrid EG and non-woven geotextile solution MacTex N was proposed for strengthening the formation.
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PORT DALHOUSIE WWTP - ROAD REINFORCEMENT
Weak subgrade threatened the safety and reliability of WWTP roads. At the Port Dalhousie Wastewater Treatment Plant in St. Catharines, the Regional Municipality of Niagara identified that the internal laneways no longer met industry standards for safe turning and vehicle maneuvering. Geotechnical investigations revealed very low bearing-capacity soils beneath the pavement, requiring a full reconstruction. The initial design called for complete pavement removal, subgrade regrading and proofrolling, and a thick section consisting of 60 mm HL-3 asphalt, 120 mm HL-8 asphalt, and 520 mm of Granular A base. This heavy granular requirement significantly increased project cost, material demand, and construction time. RMON needed a solution that would improve road performance without relying on excessive granular thickness.
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What we can do with
Biaxial Geogrids
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