LRPC

Pre- stressed steel strand when stressed and embedded in concrete, loses the applied stress exponentially as time passes. This loss of stress is called ' Stress Relaxation ' and is one of the important factors in the design of pre- stressed concrete structures. If the assumed relaxation in stress can be reduced, then many advantages can be expected. 'Low Relaxation ' wire and strand exhibits a relaxation loss not greater than 2.5% after 1, 000hrs at 20°C (68°F) when initially loaded to 70% of the specified minimum breaking strength, as compared with 5% for 'Normal Relaxation ' of stress - relieved wire and strand. TATA Wiron Low Relaxation strand are treated by the ' stabilizing ' process, which is the most widely accepted method throughout the world. This is also known as ' hot stretching' because the steel is subject to a stress - relieving temperature while it is under tension.