This mechanism was initially considered as the primary mechanism. This vertical stress is from the deformed shape of the membrane as shown in the figure below. This mechanism is based on the concept of vertical stress distribution. It has the following functional mechanisms when applied for pavement construction: This function has made the pavement construction more stabilized and strong. The geogrids as mentioned above helps in redistribution of load over a wider area. A representation of Geogrid Confining the aggregates A representation of this concept is shown below.įig. The apertures in geogrids help in interlocking the aggregates or the soil that are placed over them. This method of interlocking the aggregates would help in an earthwork that is stabilized mechanically. The geogrids serve the function of holding or capturing the aggregates together. The welding of the ribs forming apertures Functions and Working of Geogrids One in the machine direction and other in the perpendicular direction. The stretching of ribs through extrusion processĪs shown in the figure below, the ribs obtained are sent to the welding section through either side. These are done in automated machines that run at different speeds, enabling stretching of ribs and increasing their tenacity.įig. The method involves the extrusion of flat polyester or polypropylene ribs by passing them through rollers as shown in the figure below. This is recently developed a method by Secugrid manufactures. A Geogrid sample manufactured by knitting Method-3: By Welding and Extrusion This choice varies with the manufacturer of geogrids.įig. The product is bought into the market by giving them an additional coating of either bituminous material or a polyvinyl chloride or a latex. These materials are recommended to have high tenacity, to give the Geogrid the final desired property. In this method of Geogrid manufacture, single yarns of polyester or polypropylene material undergo either knitting or weaving to form flexible junctions forming apertures. A Geogrid manufactured from the method of extrusion Method-2: By Knitting or Weaving A figure representing an extruded Geogrid is shown below.įig. Next step involves the development of tensile strength, by stretching the material to both longitudinal and transverse direction. The punching of a pattern of holes would result in the formation of so-called apertures. Already set punching pattern is placed over the sheet to make holes for the formation of desired grids. The plastic material used may be high-density polypropylene or high-density polyethylene. This manufacturing method of geogrids involves extrusion of a flat sheet of plastic into the desired configuration. Here we are going to discuss three most used method of manufacturing of geogrids: Many manufacturing choices are available for ribs. In the case of geogrids, the strength at the junction is considered more important because the loads are transmitted from adjacent ribs through these junctions. This aperture varies from 2.5 to 15cm based on the longitudinal and transverse arrangement of the ribs.Īmong different types of geotextiles, geogrids are considered stiffer. The open space, as shown in the above figure, due to the intersection of perpendicular ribs are called as the apertures. These materials form matrix structured materials. Geogrid's rib formation in machine and cross machine directions of manufacturing process The other direction will be perpendicular to the machine direction ribs, which are called as the cross-machine direction (CMD).įig. These grids are formed by material ribs that are intersected by their manufacture in two directions: one in the machine direction (md), which is conducted in the direction of the manufacturing process. The polymeric materials like polyester, high-density polyethylene and polypropylene are the main composition of geogrids. The geosynthetic material, geogrids, are polymeric products which are formed by means of intersecting grids. The high demand and application of Geogrids in construction are due to the fact that it is good in tension and has a higher ability to distribute load across a large area. It can be used in the soil reinforcement or used in the reinforcement of retaining walls and even many applications of the material are on its way to being flourished. Geogrids can be categorized as geosynthetic materials that are used in the construction industry in the form of a reinforcing material. Types of geogrids, its functions and applications in construction works are discussed. □ Reading time: 1 minuteGeogrids is geosynthetic materials used as reinforcement in construction works.
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