Characterization of geosynthetics at various environmental conditions

Abstract

In the last two decades, geosynthetics became a common application in Geoenvironmental engineering. Use of geosynthetics as a sustainable construction solution in civil engineering was reported by the Waste and Resources Action Program (WRAP, 2010), presenting case studies of sludge lagoon, tailing ponds and soil waste systems, wherein geosynthetic introduced reduction in cost and CO2 emission. Geosynthetics enhance the soil quality, performance, strength parameters, and regularly pragmatic as a soil reinforcement in the exhibition of high loads while strengthening of tailing impoundments and landfills. It is an appropriate soil improvement system with unique advantages compared to other conventional ones. This manuscript introduces analyses and results of laboratory constant strain rate (CSR) test of 20%, 10%, 6%, 3%, 1% and 0.05% strain/min conducted on five specimens of geosynthetics polyester (PET) geogrids. Tests were performed according to the Multi-Rib tensile method of ASTM D6637. Main output acceptance features of tensile ultimate strength and the strain at break were justified. Stiffnesses at strain of 1% and 2% were derived. Sensitivity of strain rate of loading on strength, stiffness and non-linear properties of geogrid was inspected. Results of the measured tensile load-strain relationship for working are loads (strain ≤ 2%) and considerably acknowledged of linear simulation. The larger ultimate strength, the higher anticipated stiffness irrespective to loading strain rate. The derived stiffness at 1% is larger than corresponding for 2% strain, which reflects phenomenon of non- linearity and stiffness relaxation with progressive elongation. Behavior of reinforced soil is sensitive to stiffness rather than strength of geogrid.

In the last two decades, geosynthetics became a common application in Geoenvironmental engineering. Use of geosynthetics as a sustainable construction solution in civil engineering was reported by the Waste and Resources Action Program (WRAP, 2010), presenting case studies of sludge lagoon, tailing ponds and soil waste systems, wherein geosynthetic introduced reduction in cost and CO2 emission. Geosynthetics enhance the soil quality, performance, strength parameters, and regularly pragmatic as a soil reinforcement in the exhibition of high loads while strengthening of tailing impoundments and landfills. It is an appropriate soil improvement system with unique advantages compared to other conventional ones. This manuscript introduces analyses and results of laboratory constant strain rate (CSR) test of 20%, 10%, 6%, 3%, 1% and 0.05% strain/min conducted on five specimens of geosynthetics polyester (PET) geogrids. Tests were performed according to the Multi-Rib tensile method of ASTM D6637. Main output acceptance features of tensile ultimate strength and the strain at break were justified. Stiffnesses at strain of 1% and 2% were derived. Sensitivity of strain rate of loading on strength, stiffness and non-linear properties of geogrid was inspected. Results of the measured tensile load-strain relationship for working are loads (strain ≤ 2%) and considerably acknowledged of linear simulation. The larger ultimate strength, the higher anticipated stiffness irrespective to loading strain rate. The derived stiffness at 1% is larger than corresponding for 2% strain, which reflects phenomenon of non- linearity and stiffness relaxation with progressive elongation. Behavior of reinforced soil is sensitive to stiffness rather than strength of geogrid.