【国外标准】 Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement

This specification covers glass fiber reinforced polymer (GFRP) bars, provided in cut lengths and bent shapes and having an external surface enhancement for concrete reinforcement. It specifies the property limits and test methods for qualification, quality control and certification of GFRP bars, the geometric and mechanical property requirements, and minimum inside bend diameter of bent bars. Physical properties include fiber mass content, glass transition temperature, degree of cure, and bar sizes), whereas mechanical properties include ultimate tensile force, tensile modulus of elasticity, ultimate tensile strain, transverse shear strength, and bond strength.This specification also covers the manufacturing process for constituent materials, namely, reinforcing fibers and matrix resins; durability properties (moisture absorption, resistance to alkaline environment); sampling (product qualification, quality control and certification); product certification; and markings and traceability.1.1 This specification covers glass fiber reinforced polymer (GFRP) bars, provided in cut lengths and bent shapes and having an external surface enhancement for concrete reinforcement. Bars covered by this specification shall meet the requirements for geometric, material, mechanical, and physical properties described herein.1.2 Bars produced according to this standard are qualified using the test methods and must meet the requirements given by Table 1. Quality control and certification of production lots of bars are completed using the test methods and must meet the requirements given in Table 2.1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.1.4 The following FRP materials are not covered by this specification:1.4.1 Bars made of more than one load-bearing fiber type (that is, hybrid FRP).1.4.2 Bars having no external surface enhancement (that is, plain or smooth bars, or dowels).1.4.3 Bars with geometries other than solid, round cross sections.1.4.4 Pre-manufactured grids and gratings made with FRP materials.1.5 This specification is applicable for either SI (as Specification D7957M) or inch-pound units (as Specification D7957).1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.