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1.1 ,This test method covers the procedure for measuring the “,Aperture Stability Modulus”, of a geogrid. (The terms “,Secant Aperture Stability Modulus,”, “,Torsional Rigidity Modulus,”, “,In-plane Shear Modulus,”, and “,Torsional Stiffness Modulus”, have been used in the literature to describe this same property.)