Bond between steel strand and cement grout in ground anchorages

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Abstract
Synopsis Bond action between prestressing strand and cement grout is examined both theoretically and experimentally. Variations in strand type, embedment length, grout strength and lateral compression are investigated using a modified pull-out specimen and a simple test rig. The results support the recommended value of ultimate bond stress of 2 N/mm2proposed in the British Standard Draft for Development DD81: 1982 but show that this value may be trebled by the introduction of biaxial lateral pressure. A theoretical expression is derived, based on a frictional force mechanism, which predicts the bond strength of normal and Dyform strand. The bond characteristics of indented strand are found to be similar to those of deformed bars. A wedge action, which is attributed to “lack ofjit” of strand within the grout channel, is shown to play an important role in the establishment of a stable load/slip bond characteristic.

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