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3. ASTM D2487-11. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System). American Society of Testing Materials, USA.
4. ASTM D1883-14. Standard Test Method for California Bearing Ratio (CBR) of Laboratory-compacted Soils. American Society of Testing Materials, USA.
5. ASTM D6637. Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-rib Tensile Method. American Society of Testing Materials, USA.