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D: Repeated Load Test System Calibration
Pages 335-342

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From page 336...
... Assemble a machinist's indexing device as follows: Use a machinist's magnetic indicator block wig an adjustable extension rod extending upward. Place an accurate dial indicator (or over displacement measuring device)
From page 337...
... Clamp the mold used for preparing granular specimens on the base of the biaxial cell. Set the moldibase assembly on a flat surface such as a machinist's layout table or the base of the load frame.
From page 338...
... , the extraneous system deformation equals the total measured asocial deformation minus the calculated deformation of an aluminum or steel calibration specimen. A separate calibration must be performed for each size specimen used to evaluate MR A concentrated effort should be made toward minimizing the undesirable extraneous system deformation measured in the previous section.
From page 339...
... If axial deformation is measured externally to the biaxial cell, then determine, using equation (D2) , the extraneous resilient deformation for the same stress conditions observed in the aluminum or steed specimen calibration sequence.
From page 340...
... 6. Test the two synthetic specimens following the test procedures given in Appendix E, Recommended Standard Method for Routine Resilient Modulus Testing of Unbound Granular Base/Subbase Materials and Subgrade Soils.
From page 341...
... gage length SR4 strain gages glued to He specimen, and (3) optical extensometer if it is not used as the test deformation measurement approach.
From page 342...
... . Applied Cyclic Contact Confining Axial Stress, Stress Stress No.


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