Sources: ASTM International, West Conshohocken, Pa.; CP staff
ASTM A1096, Test Method for Evaluating the Bond Quality of Steel Wire for Concrete stems from assessment of precast concrete members where indented prestressing wires exhibit potential bond-related cracking. Soon to be published by ASTM Committee A01 on Steel, Stainless Steel and Related Alloys, the standard is based on A1081, Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand.
Research led by ASTM Committee A01 member and Kansas State University Engineering Professor Robert Peterman found that wires with low bond quality can lead to structural deficiency while those bonding too quickly—often running near the concrete surface—can cause longitudinal splitting along the wires. A1096 will help establish an acceptable bond range that corresponds with prestressed concrete producers’ specific needs, allowing for better specification in purchases and better standardized testing.
Insteel Wire Products metallurgical engineer Christopher Reeve, who chairs an ASTM section behind A1096, invites participation from parties interested in helping to develop and maintain standards related to single prestressing wire; epoxy-coated, compacted, indented or two- and three-wire strand; and, related products. Committee A01 will meet next during the May 17-20 committee week in St. Louis. Technical contact, Christopher Reeve, 615/451-6330, ext. 2762, [email protected]; ASTM staff liaison, Kevin Shanahan, 610/832-9737, [email protected].