ASTM Steel Standard covers test for prestressing PC strand.
Press Release Summary:
ASTM A1081/A1081M, Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand. According to one member of committee responsible for ASTM A1081/A1081M, test will enable steel wire strand (PC strand) producers to evaluate bond characteristics of their product as QC/QA check point in their manufacturing processes. Such a test will also enable qualification of potential PC strand suppliers and monitoring of existing suppliers.
Original Press Release:
New ASTM Steel Standard Covers Test for Prestressing Steel Wire Strands
W. CONSHOHOCKEN, Pa.—Prestressing concrete has existed in the construction industry for more than 100 years, but without a repeatable and reproducible test capable of quantifying the bond performance of prestressing steel wire strand (commonly called PC strand). This test has now been developed in the form of ASTM A1081/A1081M, Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand.
ASTM A1081/A1081M was developed by Subcommittee A01.05 on Steel Reinforcement, part of ASTM International Committee A01 on Steel, Stainless Steel and Related Alloys.
Prestressing concrete technology most commonly uses seven-wire prestressing steel strands, as described in ASTM A416/A416M, Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete. PC strands impart compressive force to concrete structural members, enabling otherwise brittle concrete members to reliably span long distances. When PC strands are tensioned in forms prior to pouring the concrete, the tension in the strands must bond to the concrete sufficiently to cause the concrete member to be in a state of compression once the strands are released from the tensioning anchorages.
Bonding issues in the pre-tensioned segment of the prestressed concrete made evident the need for the bonding test described in ASTM A1081/A1081M.
“Prestressing concrete is a vital construction technology used throughout the world,” says Christopher Reeve, a metallurgist with Insteel Wire Products, and a member of Committee A01. “PC strand producers need the test covered in ASTM A1081/A1081M to be able to evaluate the bond characteristics of their product as a quality control/quality assurance check point in their manufacturing processes.”
In addition, Reeve notes, PC strand users need such a test to be able to qualify potential PC strand suppliers and monitor existing suppliers.
A01.05 invites interested parties to participate in its standards developing activities. Due to the limited number of facilities currently available to perform the test, A01.05 is particularly interested in identifying laboratories that are willing to perform it.
To purchase ASTM standards, visit www.astm.org and search by the standard designation, or contact ASTM Customer Relations (phone: 877-909-ASTM; sales@astm.org). ASTM International welcomes participation in the development of its standards. For more information on becoming an ASTM member, visit www.astm.org/JOIN.
ASTM International is one of the largest international standards development and delivery systems in the world. ASTM International meets the World Trade Organization (WTO) principles for the development of international standards: coherence, consensus, development dimension, effectiveness, impartiality, openness, relevance and transparency. ASTM standards are accepted and used in research and development, product testing, quality systems and commercial transactions.
For more news in this sector, visit www.astm.org/sn-metals or follow us on Twitter @ASTMMetals.
ASTM Committee A01 Next Meeting: May 20-23, 2013, May Committee Week, Indianapolis, Ind.
Technical Contact: Christopher F. Reeve, Insteel Wire Products, Gallatin, Tenn., Phone: 615-451-6330, ext. 2762; creeve@insteel.com
ASTM Staff Contact: Kevin Shanahan, Phone: 610-832-9737; kshanahan@astm.org
ASTM PR Contact: Barbara Schindler, Phone: 610-832-9603; bschindl@astm.org
