Testing anchors using hydraulic jacks is the preferred way to ensure the anchorage meets design loads. The post tension load can also be used to apply a holding load.
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https://www.halversoncivil.co.nz/services/post-tensioning-and-testing#sigProIdb42a365306
https://www.halversoncivil.co.nz/services/post-tensioning-and-testing#sigProIdb42a365306