2018-12-11_PERMIT FILE - C1981008A

Home Browse Search

THE GEOGRID MYTH Woven Geotextiles—why they really work better! For subgrade stabilization applications where weak subgrade conditions exist, geogrids are limited In their effectiveness due to their low tensile strength, inability to separate and provide filtration, expensive mechanical connectors, and high cost. In subgrade stabilization applications the product that works best is often a woven geotextile. Woven geotextiles combine the properties of high tensile strength and modulus, and high confinement, in addition to their ability to act as a filter and separator Woven geotextiles can also be seamed together to create uniform high strength in all directions. In fact, if you look at any subgrade stabilization application, woven geotextiles will always out perform geogrids, technically and economically. Geognds (right) allow soft subgrade sods to pump through while woven geotextiles peft) provide separation and filtration A Look at the Facts tells you why! I Properties of Mirafi HP Woven Geotextiles Versus Biaxial Geogridsj MIRAR Biaxial Geogrid MIRAR Biaxial Geogrid Units HP370 Type 1 HP570 Type 2 MD XD MD XD Tensile Strength Ultimate lbs/ft 2700 910 1410 4800 1278 2188 5% Strain lbs/ft 1350 620 890 2400 820 1340 2% Strain lbs/ft 540 300 445 960 380 595 Interaction - Ci 0.8 0.8 0.95 0.8 Separation/Filtration Excellent None Excellent None These properties were obtained from published manufacturers' literature and actual test programs Technical Comparison - When you look at the key product properties required of a geosynthetic for subgrade stabilization applications—high tensile strength and modulus, high confinement, filtration, separation, and seam strength—HP Geotextiles far exceed those for geogrids In every category. In every category Mirafi HP woven geotextiles exceed the properties of geogrids, often by a factor of 2 or more. In addition, woven geotextiles provide separation and filtration functions, and can provide multi -directional strengths in excess of 3000 pounds per foot, none of which are possible with geogrids. Economical Comparison - The material cost of the Mirafi HP woven geotextiles are 20 to 50 percent less than that of the geogrid alone, they are avail- able in wider roll widths and can be seamed together to reduce overlap requirements. Mirafi HP geotextiles save time and money over geogrids any way you look at it! THE BOTTOM UNE - While TC Mirafi manufactures both woven and non -woven geotextiles and geogrids, if you need a geosynthetic product `1� for subgrade stabilization applications, we recommend woven geotextiles every time. Section 2.05.3(3) Page 27 April 2017 (MR -104)