ISO 14655 pdf download.Epoxy-coated strand for the prestressing of concrete
1 Scope
This International Standard specifies requirements for fusion-bonded, epoxy-coated, or epoxy-coated and filled, seven-wire prestressing steel strand for the prestressing of concrete. NOTE Use of epoxy-coated strand in pre-tensioned applications such as fire-rated construction should be approached with caution.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2808:1 997, Paints and varnishes — Determination of film thickness . ISO 6272:1 993, Paints and varnishes — Falling weight test . ISO 6892:1 998, Metallic materials — Tensile testing at ambient temperature. ISO 6934-4:1 991 , Steel for the prestressing of concrete — Part 4: Strand . ISO 9227:1 990, Corrosion tests in artificial atmospheres — Salt spray tests .
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply. 3.1 coated and filled strand epoxy-coated seven-wire strand in which the void spaces between the wires are completely filled with the epoxy coating to prevent migration of corrosive media, either by capillary action or other hydrostatic forces 3.2 coated strand seven-wire prestressing steel strand which has been coated with a fusion-bonded epoxy coating 3.3 disbonding loss of adhesion between the fusion-bonded epoxy coating and the strand 3.4 fusion-bonded epoxy coating coating containing pigments, thermosetting epoxy resins, crosslinking agents, and other additives, which have been applied in the form of a powder on to a clean, heated metallic substrate and fused to form a continuous barrier 3.5 grit inert particles that are impregnated into the surface of the coating 3.6 grit-impregnated strand coated strand with grit impregnated into the surface of the coating 3.7 holiday discontinuity in a coating which is not discernible to a person with normal or corrected vision 3.8 manufacturer any organization which produces coated strand 3.9 sealing material a coating system, formulated to be compatible with the fusion-bonded epoxy coating, used to repair damaged areas and cut ends 3.10 test unit the quantity of coated strand to be accepted or rejected together, on the basis of the tests to be carried out on sample products in accordance with the requirements of the product standard or order NOTE Adapted from ISO 404:1 992.
4 Materials
4.1 Prestressing steel strand Prestressing steel strand to be coated shall be in accordance with ISO 6934-4 or any other product standard as specified by the purchaser, and shall be free of contaminants such as oil, grease or paint. 4.2 Epoxy powder The epoxy powder shall comply with the requirements listed in annex B. The material shall be of organic composition except for the pigment, or grit if applicable, which may be inorganic if used. The purchaser shall be furnished a written certification that properly identifies the batch designation of the epoxy powder used in the order, quantity represented, date of manufacture, name and address of the powder manufacturer and a statement that the supplied epoxy powder is the same composition as that which was qualified under the requirements of annex B. If specified in the order, a representative 0,25 kg sample of the epoxy powder material shall be supplied to the purchaser. The sample shall be packaged in an airtight container and identified by batch designation.