Overview
ISO 15835-1:2018 specifies performance and manufacturing requirements for reinforcement couplers used to make mechanical splices of steel reinforcing bars in reinforced concrete. The standard focuses on couplers produced in continuous manufacturing and is intended to be used with adequate bar processing and quality control. It covers couplers for structures under predominantly static loads, and provides additional requirements when couplers are used in high‑cycle fatigue or low‑cycle (seismic) reverse loading applications. Note: compression‑only couplers (e.g., end‑bearing sleeves) are not covered.
Key Topics and Technical Requirements
- Scope of verification: Properties of a coupler are verified via testing of the complete mechanical splice (clause 5).
- Categories of splices:
- B (Basic) – strength, ductility, slip under static loads
- F (Fatigue) – adds high‑cycle fatigue requirements
- S (Seismic) – adds low‑cycle elastic‑plastic reverse loading requirements
(If tested for both F and S, classification FS is permitted.)
- Strength and ductility: Mechanical splice tensile strength must meet the requirements referenced to the reinforcing bar product standard; ductility of the spliced bar outside the splice shall be at least 0.7 × Agt (specified characteristic elongation). If Agt is not specified, a minimum of 3% elongation is required (clause 5.3).
- Slip under static forces: Slip is measured by one of two defined test options; the median slip of tests shall not exceed 0.10 mm, with outliers no more than 0.05 mm above the maximum. Longer couplers (>100 mm) have special considerations (clause 5.4).
- Fatigue and seismic performance: Optional, but specified test programmes and acceptance criteria exist for high‑cycle fatigue and low‑cycle reverse loading (clauses 5.5–5.6).
- Traceability & installation: Requirements for marking, batch/lot traceability and manufacturer installation instructions are specified (clause 5.7–5.8).
- Testing references: Mechanical splice tests follow ISO 15835-2; reinforcing bar tests reference ISO 15630-1.
Applications
- Ensures reliable mechanical splices in reinforced concrete structures: buildings, bridges, precast elements, and infrastructure where continuity of reinforcement is required.
- Controls crack widths and structural continuity by limiting slip and ensuring ductile failure modes.
- Applicable for designers, specifiers and fabricators selecting couplers for static, fatigue‑sensitive, or seismic applications.
Who Uses This Standard
- Coupler manufacturers and quality managers
- Structural and geotechnical engineers specifying reinforcement splicing
- Construction contractors and precast producers
- Testing laboratories and conformity assessment bodies
- Procurement and specification writers seeking compliance in reinforced concrete projects
Related Standards
Keywords: ISO 15835-1:2018, reinforcement couplers, mechanical splices, reinforcing bars, slip requirement, ductility, high-cycle fatigue, seismic splices, concrete reinforcement.