![]() Measured losses are compared with established relaxation theory and relaxation limits provided in standard specifications. The influence of several additional parameters on relaxation was also evaluated including initial stress level, galvanization on plain (black) steel, coupled bars, and the variability provided by different steel heats. Stress relaxation losses were determined for 24 specimens by measuring the force change in the specimens for 1,000 h under constant strain. The experimental program objective was to evaluate the stress relaxation properties of these various materials. ![]() The bars were fabricated from 4142 quenched and tempered (QT) carbon steel and three stainless steel alloys: Type 450, Type 630, and Type 2507. This study was a component of a large-scale research program to develop a more corrosion-resistant, posttensioning bar. ![]() An experimental program was conducted to investigate the stress relaxation properties of large-diameter bars for posttensioning applications. ![]()
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