Evaluating Bond of Seven-Wire Steel Prestressing Strand ASTM A1081

Evaluating Bond of Seven-Wire Steel Prestressing Strand ASTM A1081

ASTM A1081 test method determines the strength and properties of the bond of a seven-wire prestressing strand. The tensile force that pulls the strand in a cylindrical steel casing with the help of a cured mortar is evaluated. The test results are indicated in either inch-pound units or SI units.


    ASTM A1081 method establishes the standard for prestressing steel strands in pre-tensioned and post-tensioned concrete constructions. The strand bond is impacted by manufacturing processes, subsequent handling, and storage conditions. The bond strength and bond breaker can be determined. Performance and reliability for construction use are studied.

    Test Procedure:

    Six strands samples are withdrawn from a single length and placed in a cylindrical casing with a cement mortar. The strengthened mortar causes the steel embedded cylinder to land into a tensile testing machine. The tensile force on the loaded end and the displacement of the free end of the strand are determined, and results are drawn.

    Specimen Size : 

    Six samples of seven-wire steel prestressing strand with nominal diameters of 0.500 in. (12.7 mm) or 0.600 in. (15.24 mm) are selected from a single continuous length. Each sample should be 800 mm long.


    The tensile force measured on the loaded-end of the strand corresponds with a movement of 0.1 in. (2.5 mm) at the free end of the strand.
    The load (that is, pull-out force) rounded to the nearest 10 lbf (50 N) is calculated when the free end of the strand has moved down about 2.5 mm into the mortar due to the force applied on the loaded end.


    Core Materials Testing Services


    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing

          STEP 01

          You share material and testing requirements with us


          STEP 02

          We ensure your sample pick-up in an ensured manner


          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            idea icon
            Want to connect with an expert before you leave?