Geogrid used in construction works China Supplier Tuohua email sales11@wiremeshofchina.com
Geogrids is a geosynthetic materials used as reinforcement in construction works. Types of geogrids, its functions and applications in construction works are discussed.
Geogrids can be categorized as geosynthetic materials that are used in the construction industry in the form of a reinforcing material. 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.
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.
Origin of Geogrids and its Manufacture
The geosynthetic material, geogrids, are polymeric products which are formed by means of intersecting grids. The polymeric materials like polyester, high-density polyethylene and polypropylene are the main composition of geogrids.
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 other direction will be perpendicular to the machine direction ribs, which are called as the cross-machine direction (CMD).
These materials form matrix structured materials. The open space, as shown in the above figure, due to the intersection of perpendicular ribs are called as the apertures. This aperture varies from 2.5 to 15cm based on the longitudinal and transverse arrangement of the ribs.
Among different types of geotextiles, geogrids are considered stiffer. 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.
Many manufacturing choices are available for ribs. Here we are going to discuss three most used method of manufacturing of geogrids:
Method-1: By Extruding
This manufacturing method of geogrids involves extrusion of a flat sheet of plastic into the desired configuration. The plastic material used may be high-density polypropylene or high-density polyethylene. Already set punching pattern is placed over the sheet to make holes for the formation of desired grids.
The punching of a pattern of holes would result in the formation of so-called apertures. Next step involves the development of tensile strength, by stretching the material to both longitudinal and transverse direction. A figure representing an extruded Geogrid is shown below.
Method-2: By Knitting or Weaving
In this method of Geogrid manufacture, single yarns of polyester or polypropylene material undergo either knitting or weaving to form flexible junctions forming apertures. These materials are recommended to have high tenacity, to give the Geogrid the final desired property.
The product is bought into the market by giving them an additional coating of either bituminous material or a polyvinyl chloride or a latex. This choice varies with the manufacturer of geogrids.
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