Geogrid, made of polymeric fibers (mainly from PET fibers) are distinguished by high mechanical properties and are used to create reinforcing layers. Geogrid reinforced base like the pavement of krupnofraktsionnyh materials, slopes of embankments. In the upper layers of reinforcing the pavement along with the geogrid of PET fibers are widely used geogrid from the glass or basalt fibers. Geogrid of glass or basalt fibers are similar and superior to PET geogrids their mechanical characteristics of the fibers, but their properties are less stable in comparison with polymeric geogrids in relation to possible violent impacts during operation. The main disadvantages steklosetok and basalt nets: 1) Inability to impregnate fiberglass asphalt (only possible surface coating fiberglass with bitumen, so fiberglass is a foreign body between layers of asphalt concrete) – a similar problem with the linkage in asphalt grid of basalt and metal grids, 2) poor adhesion with asphalt steklosetok 3) Poor resistance fiberglass aggressive Wednesdays and water – given the available test loss in strength after 7 days – about 10%, lime – about 30% of its original strength.
This negatively affects the behavior of glass fiber in the ground structures – due to rapid loss of strength from exposure to groundwater and water-borne particulate material, 4) High strength fiberglass or loss of basalt nets during laying and compaction asphalt mix or the overlying soil layer, which is associated with a low resistance material such materials to mechanical damage and impacts, 5) Lack of resistance to shear, which leads to abrasion of the material in the coating (this is partly due to the chaotic structure of the fibers of fiberglass). There were cases when, after 3 .. 5 years old asphalt covering fiberglass mechanical wear a white powder. In ground fiberglass in Europe do not apply at all, as expected loss of strength geogrids and faster than in the asphalt concrete, 6) Glass separates the layers of asphalt, which leads to difficulty of transfer traffic loads on the underlying layers of road construction, increased wear of asphalt concrete and accelerated the formation of ruts, waves, combs and other deformations of asphalt concrete pavements; 7) Various factors (the difference – about 12 .. 20 times) fiberglass thermal expansion worsen the already nonideal work together fiberglass and asphalt, 8) Geogrid of fiberglass and basalt bad perceives the dynamic forces due to which the relative movement between the asphalt and fiberglass can almost completely destroy the fiber, 9) Glass is very fragile material and in any cuts the load is destroyed, and after milling asphalt to create an additional layer of leveling, which leads to additional costs. Most interesting is that a number of manufacturers in steklosetok as material strength indicate the strength of individual strands (glass fiber). When these fibers produce geogrids, about 40% of the original strength is lost due to friction at the nodes, the friction of adjacent threads of each other and some loss of strength associated with the production. More detailed analysis of production technologies geogrids manufacturers, as well as with the current situation and outlook for the Russian market can be meet in the report of the Academy of marketing research Conjuncture industrial markets "Market geogrids from NM PET yarn in Russia."Tags