NZ International Convention Centre

The team at Grouting Services has tested the first proving trial anchors on the NZICC project and verified a geotechnical ultimate bond rupture that ranged from 1150kPa to 1500kPa in the waitemata series sandstone. The trial anchors comprised 14No x 15.2mm strands (3,570kN UTS) with a 3m bond and 15m free length in a 150mm diameter drill hole. A design geotechnical ultimate bond stress of 600kPa was used and based on the testing we have have demonstrated factors of safety ranging from 1.8 to 2.5. One of the anchors could not be tested to the structural limit of the tendon due to bearing failure of the reaction face.