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1808.4.1.4 High Strain, Dynamic Compressive Test Methods
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High strain, dynamic compressive test methods performed in accordance with ASTM D 4945 shall be permitted to be used where three or more load tests are required and subject to the approval of the commissioner. In such case, at least one high strain dynamic test shall be performed as a calibration on a static load tested pile or nearby pile driven to comparable resistance. No more than one-half of the required number of load tests may be performed by high strain dynamic methods. High strain dynamic tests shall be performed under the supervision of an engineer experienced in the methods used. The number of high strain dynamic tests shall be at least twice the number of replaced static load tests.
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