FIB 33: Durability of post-tensioning tendons
The sturdiness of post-tensioning tendons relies unquestionably at the sturdiness of the fabrics used, yet there are layout suggestion specifics that are additionally of significant significance: the post-tensioning format and layers of defense corresponding to concrete hide and chosen fabrics in view of the aggressivity of our surroundings for instance.
It is widely known that sustainability rules consultant the Engineer from the very starting, on the venture notion, in the course of building and the carrier lifetime of a constitution. judgements made in the course of conceptual and layout degree have the biggest impact at the toughness and sustainability of post-tensioning tendons. fib Bulletin 33 addresses the specifics for prestressed concrete constructions: the sturdiness of post-tensioning tendons. it may be famous that it doesn't repeat subject matters which have been addressed in different fib announcements and that's universal for either strengthened concrete and prestressed concrete structures.
Pre-tensioning, that's used generally within the precast undefined, isn't really thought of right here, even if conclusions and proposals herein might, in lots of circumstances, even be applicable.
This advice was once ready by way of operating get together 5.4.2, longevity specifics for prestressed concrete constructions, in cooperation with fib fee nine, Reinforcing and prestressing fabrics and structures. A initial model of this advice served because the easy rfile for the second one workshop on "Durability of post-tensioning tendons", hung on 11-12 October 2004 in Zurich. This workshop used to be a follow-up to the 1st workshop held in Ghent in 2001. Bulletin 33 contains revisions akin to the agreed result of the Zurich workshop.
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Extra resources for FIB 33: Durability of post-tensioning tendons
Vertical grouting presents somewhat different problems and special measures are required. Water is separated from the grout by capillary action and is filtered through the voids between the wires of the strands. This effect is amplified because of the differential pressure between bottom and top of the duct.
Stressing jacks should be compatible with the post-tensioning system. Valid calibration records for the force measuring devices should be available on site before the stressing starts. Application and/or transfer of prestressing to a structure should be done progressively and is only allowed when the concrete strength is equal to or greater than the minimum compressive strength specified for the post-tensioning system. The stressing results should be recorded for every tendon, including at least the force and elongation at each stage of stressing and their conformity or non-conformity with the requirements.
The partial vacuum is applied first. After checking that the vacuum can be maintained the grout is injected into the duct until it is completely filled. Fig. 22 shows a typical vacuum grouting equipment set-up. Vertical ducts can be required in bridges, for example as tie-down tendons of unbalanced cantilevers and for deep webs in box girders and piers. They may also be used in reservoirs, off-shore structures and nuclear containments. Vertical grouting presents somewhat different problems and special measures are required.