Durable Bonded Post-Tensioned Concrete Bridges (Concrete by Concrete Society

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Additional resources for Durable Bonded Post-Tensioned Concrete Bridges (Concrete Society Technical Report)

Sample text

The aim should be to establish as far as possible the characteristics of each void to be grouted, including its length, cross-section at suitable intervals, volume, presence and position of constrictions, continuity and extent and position of leakage. The ability to do this will depend on the available access and the acceptability of drilling closely spaced holes. The extent of drilling should be decided with the agreement of the engineer in order to avoid unacceptable damage to the fabric of the bridge.

_ c 8 5 c s There are some special considerations for segmental construction, which mainly relate to face anchorages at joints, both for in situ and match-cast precast segmental construction. Typical layouts for precast segmental construction are shown in Figures 16 and 17,and for in situ segmental construction in Figure 11. The particular concern is to protect the anchorage, including the cap, from any possible water leakage in the joints. Special care needs to be paid to the following details: 0 2nd segment 1st segment Sealing of the anchorage recess or box-out, particularly if the distance from the edge of the recess to the edge of the segment is small (this concrete is easily damaged).

The stages at which the tests might be undertaken are therefore considered below. Under each heading, the most appropriate tests are discussed, with reference to Appendix A, where further details of the tests themselves may be found. 1 Type-approval at pre-contract stage (duct systems, grout materials and procedures) One of the most efficient means of achieving a quality end product is to test certain aspects that influence quality in advance of potential contractual complications. This testing may include the following, separately or in combination: 0 testing of’duct systems 0 testing of grout materials e testing of combinations of duct systems, grout materials, and duct geometry.

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