Mechanical Properties of a New Prestressing Strand with Ultimate Strength of 2160 MPa

摘要

A new prestressing strand was recently developed. The objective of this study is to investigate and provide the mechanical properties of the new strand, as these properties are essential in the design and construction of prestressed concrete structures. The experimental program includes a tensile test, a fatigue test, a relaxation test, and a stress corrosion test. In the tensile test, an optimal gripping method was initially determined and the measured ultimate strength was found to be higher the nominal strength of the new strand. The new strand does not exhibit any degradation in its mechanical performance after fatigue loading. Compared to the existing strand with the strength of 1,860 MPa, the new strand also showed equal or enhanced performance in the stress relaxation and the stress corrosion tests.