BS EN 523:1997- Steel strip sheaths for prestressing tendons. Terminology, requirements, quality control
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This standard is applicable to uncoated cylindrical steel sheaths with a corrugated profile and with a nominal internal diameter of up to 130 mm1) and their connectors (couplers) which are assembled to form ducts for prestressing tendons in post-tensioned prestressed concrete elements. It is only applicable to sheaths and connectors made of interlocked or welded steel strip2)3) . The seals required between sheaths and couplers are not covered by this standard4)
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