Low relaxation PC strand refers to prestressing steel strand that has undergone a special stabilization process to significantly reduce internal stress loss under constant strain over time.

In simple terms:

• Normal strand → loses more stress over time
• Low relaxation strand → maintains stress much better

This characteristic is especially important in structures that are designed for long service life (30–100 years).

Why Relaxation Matters in Prestressed Concrete

Relaxation is the gradual reduction of stress in steel under constant strain.

In prestressed concrete systems, excessive relaxation can lead to:

• Loss of prestressing force
• Increased deflection
• Cracking risks
• Reduced durability

Using low relaxation PC strand helps engineers:

• Maintain structural integrity
• Reduce maintenance costs
• Improve long-term safety