InfraGrid is InfraGeo's geogrids which specially designed to interact with the soil in a wide variety of civil engineering applications. The main types of geogrids we can supply for ; -InfraGrid IG series : High tenacity polyester yarns woven(or knitted) PVC coated geogrids. -InfraGrid PX series : Stiff monolithic plastic geogrids by extrusion and punching process of polymeric HDPE or Polypropylene sheets. -InfraGrid EX series : Fiber reinforced polymeric strip geogrid with woven structure and welded junctions. -InfraGrid PG series : High strength reinforced glass grids for restraint from cracks in asphalt concrete overlays. The wide range of InfraGrids are in use in accordance with various environmental conditions and optimum applications. * Characteristics and Advantages - High Resistance to Creep under Constant Stress - High Abrasion Resistance - High Survivability to Earthquake - Excellent Biological, Chemical and Temperature Stability - Excellent Resistance to Ultra-violet Exposure - Pliable Enough for Any Installation - 30-50% Cost Savings Compared with Conventional Retaining Wall System - Rapid and Simple Construction - Excellent Aesthetic View of Structure - Excellent Dimensional Stability ( InfraGridR EX series) * Applications - Reinforcement of Embankment Fills and Earth Dams - Construction of Bridge Abutment and Overpass Way - Reinforcement of Shallow Foundation - Beneath Aggregate in Unpaved Roads - Repairing Slope Failures and Landslides - Reinforcement of Earth Retaining Structures - Construction Mattress for Fills over Soft Soils - As Gabions for Erosion Control Structures - Restraint from Reflection Cracks in Asphalt Overlays * Construction Procedures of InfraGrid IG Reinforced Walls 1. Wall Foundation Preparation - Site excavation and grading : properly prepared as detailed on the plans. - The excavated area inspection : any soft areas shall be excavated and replace with suitable compacted backfill material. - Proof rolling with vibratory compaction or damper. - Step levels of concrete foundation are needed if the excavated profile forms a slope 2. Fill Material Placing and Compaction - The fill should be compacted to at least 95% of the maximum density. - The geogrid reinforcement shall be pulled out and anchored prior to placing of backfill material. - The rolling should not be done directly over the geogrid, and at least 150 mm blanket layer should be laid over geogrid before rolling. - Any folding and movement of the geogrid shall be avoided during placing and compacting the backfill material. - The placement and compaction of backfill material should proceed from wall face side. - The construction equipment should not be allowed to change direction suddenly. 3. Drainage System a. Drainage system in backfill part - Underdrain pipe at the bottom of the geogrid reinforced wall - Geotextile drain + Gravel at the excavated back slope - Horizontal drainage with geotextile or gravel b. Surface drainage system - Prefabricated or concrete ditch on the top or bottom-front of geogrid reinforced wall 4..Quality Control of Backfill All backfill material used in the reinforced Sieve Size Percent Passing zone shall be reasonbly free from organic 20 mm 100 or other deleterious material and shall 4.75 mm 100 - 20 conform to the limits(AASHTO, 1990) 0.425 mm 0 - 60 presented as follow. 0.075 mm 0 - 15 Plasticity Index(PI) ≤ 6.0