ASTM D3963/D3963M - Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars
Understanding ASTM D3963/D3963M
Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars
Introduction
The use of protective coatings is essential in preventing corrosion of steel reinforcing bars used in concrete structures. This helps ensure the durability and structural integrity of the construction. The Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars, designated as D 3963/D 3963M, provides guidelines for the fabrication and handling of deformed and plain steel reinforcing bars with epoxy coating. This article aims to shed light on this important test method while also providing a detailed procedure for its application.
Scope
The specification outlines the requirements for the fabrication and jobsite handling of epoxy-coated steel reinforcing bars in accordance with Specification A 775/A 775M. The standard is applicable for orders in both SI units (Specification D 3963M) and inch-pound units (Specification D 3963). The values in both systems are treated separately and must not be combined, as it may lead to nonconformance with the specification. However, this standard does not cover all safety concerns associated with its use. The responsibility lies with the user to establish appropriate safety and health practices and determine regulatory limitations before utilizing the standard.
Referenced Documents
The standard references several ASTM standards and federal reports that provide further information on the fabrication and handling of epoxy-coated steel reinforcing bars. These include Practice E 691 for conducting an interlaboratory study to determine the precision of a test method and Test Method G 20 for evaluating chemical resistance of pipeline coatings.
Coating Repair Materials
Section 3 of the specification focuses on the requirements for coating repair materials. These materials should be compatible with the coating, inert in concrete, and suitable for repairs either at the applicator, fabricator, or in the field. Before use, such materials must be approved in accordance with Annex A1. The manufacturer is responsible for specifying the metal surface preparation method and patching application procedures for use in the field.
Handling and Identification
Section 4 emphasizes the importance of handling and identifying coated bars with care. All systems used for handling coated bars must have padded contact areas, and bundling bands should be padded or replaced with suitable banding to prevent coating damage. Additionally, lifting bundles of coated bars must be done with proper equipment to prevent abrasion and damage.
Fabrication of Steel Reinforcing Bars After Coating
Section 5 outlines the requirements for steel reinforcing bars to be fabricated after applying the coating. These bars must meet the specifications outlined in the standard. Furthermore, the handling and storage of coated bars at the fabricator's facility must adhere to the guidelines in Section 4 and 6.3.
Repairs
Section 7 focuses on repairing damages incurred during fabrication, handling, shipment, and jobsite handling. It is the fabricator's responsibility to repair coating damages due to fabrication and handling at their facility. Coating damages during shipment and jobsite handling fall under the contractor's responsibility. Patching materials used for repairs must meet the requirements of Section 3. All repairs must be performed as soon as possible and before visible oxidation appears on the steel surface and before shipment to the jobsite.
Storage, Handling, and Placement at the Jobsite
Section 6 emphasizes the importance of proper storage, handling, and placement of coated steel reinforcing bars at the jobsite. It is essential to use systems with padded contact areas for handling and avoid dropping or dragging coated bars. Coated and uncoated steel reinforcing bars must be stored separately. Long-term storage should be minimized, and material delivery should be scheduled based on construction progress.
Conclusion
The Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars (D 3963/D 3963M) plays a critical role in ensuring the durability and structural integrity of concrete structures. By following the guidelines outlined in this specification, engineers, fabricators, and contractors can effectively apply protective epoxy coatings to steel reinforcing bars, preventing corrosion and extending the lifespan of vital infrastructure.