Q

Can the Pile Driving Analyzer® (PDA) be used to measure the energy transferred to an SPT rod?

A

The Pile Driving Analyzer® may be used to measure the energy transferred to Standard Penetration Tests (SPT) rods by SPT hammers, as called for by the many project specifications that mandate compliance with the American Society for Testing and Materials (ASTM) D4633 and ASTM D6066, or with the European Standard EN ISO 22476-3. Both the European Standard and ASTM D4633 accept only one way of determining this energy - through Force and Velocity measurements on the rod. This is something that the PDA can do, provided that the sampling frequency requirements of the code applicable in your part of the world (ASTM D4633 or EN ISO 22476-3) is met. Any current PDA mode complies with ASTM D4633 or EN ISO 22476-3 provided you acquire the optional SPT Software Program Measurements on SPT rods also require the use of an instrumented rod. It consists of a piece of rod about 0.6 m (2 ft) long, with foil strain gages glued to it and calibrated. Regular PR accelerometers are attached to the rod in the usual way. The strain transducers used for testing foundations cannot be used on SPT rods.