Under 910.04.02.02 Post-Tensioning Working Drawings, I suggest that is be made clear that the details for the ducts must include the appropriate friction and wobble coefficients to be used in the design calculations.
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See attached file.
Comments are:
- use of word "couplers"
- request of use of ETAG 013 for dynamic testing
- use of curvature radii for ducts smaller than 10 m
- use of FIB Bulletin 75 not connected with ETAG 013
- use of corrugated plastic ducts with longitudinal flow channels
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910.02 References:
ETAG 013- Obsolete. It has been replaced by EAD 160004-00-0301 Post-tensioning systems for prestressing of structures.
Also EAD 16007-00-0301 Special filling products for post-tensioning kits has been issued
910.04.01.01 “induced slip requirement”
-what does “induced slip requirement” refer to? Does it mean “wedge draw-in”? if so, it is system-dependant and covered on each system ETA or equivalent
910.04.02.02 “where posttensioning tendons are anchored on concrete…”
Only passive anchorages based on concrete embedded bulbs are considered. Other passive anchorages typologies (i.e. Anchor head + wedges + cap; i.e. anchor head + compression fitting + cap; others…)
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910.04.02.04.02 Testing
“unless the anchorage is located or used in such a manner that repeated load applications could be expected on the anchorage.”
- Who decides if the anchorage is subject to dynamic loads?
- Can previous representative tests used to justify the requirements?
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910.04.04.05 “Mill test certificates for prestressing bars…”
strand is missing. We propose to use “main tensile element” instead (as in other documents, such as FiB)
910.04.02.08 Corrosion inhibitor
Vapour phase corrosion inhibitors (VPCI) are banned in Florida. Some studies of failed tendons were linked to the VPCI's poor dispersive properties and non-uniform protection.
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910.05.01.01
“when anchorages and couplers for PT are tested in an unbonded condition”
we are not aware of any testing procedure that tests PT in a grouted condition.
- No requirement on elongation? Only on force?
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910.01.02.01
“The ducts, including joints, shall be watertight, vapour-tight and nonreactive with concrete, tendons, or grout. The ducts and components shall meet the requirements of Post-Tensioning System Tendon Protection Level 2 (PL-2) according to PTI/ASBI M50.3”
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910.05.02.02
“Plastic for the external post tensioning ducts shall be code letter D or E for colour and ultraviolet (UV) stabilizer according to ASTM D3350. The plastic duct shall be manufactured according to ASTM D2239 from virgin material.”
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910.05.02.03
“Ducts at Deviators
Ducts within a deviator for post-tensioning tendons shall be galvanized steel pipe according to ASTM A53,Type E, Grade B, with a wall thickness of not less than 3 mm. The duct shall be formed to conform to the alignment of the tendon.”
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910.05.05.02
Vapour phase corrosion inhibitors (VPCI) are banned in Florida. Some studies of failed tendons were linked to the VPCI's poor dispersive properties and non-uniform protection.
Soluble oil corrosion protection products are recommended, and of widespread use around the industry
910.06.04
“Each gauge shall be capable of indicating forces directly in Newtons or be accompanied by a conversion chart so that the imperial readings can be converted into Newtons”
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910.07.03
Vapour phase corrosion inhibitors (VPCI) are banned in Florida. Some studies of failed tendons were linked to the VPCI's poor dispersive properties and non-uniform protection.
Soluble oil corrosion protection products are recommended, and of widespread use around the industry
Read more
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Under 910.04.02.02 Post…
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OPSS 910 Construction Specification for Stressing Systems for Post-Tensioning
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See attached file. Comments…
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We hereby attached Freycan…
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Please see attached file…
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910.02 References: ETAG 013-…
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910.04.01.01 “induced slip…
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910.04.02.02 “where…
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910.04.02.04.02 Testing Why…
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910.04.02.04.02 Testing …
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910.04.04.05 “Mill test…
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910.04.02.08 Corrosion…
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910.05.01.01 “when…
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910.01.02.01 “The ducts,…
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910.05.02.02 “Plastic for…
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910.05.02.03 “Ducts at…
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910.05.05.01 Missing…
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910.05.05.02 Vapour phase…
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910.06.04 “Each gauge shall…
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910.07.01 Personnel must be…
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910.07.03 Vapour phase…
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