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Abstract

During the grouting of post-tensioned structures, voids left by bleed water creates the risk of corrosion by aggressive agents on the prestressing steel. In this paper, the development of and countermeasures for bleed water are discussed. To improve the bleed performance of conduits, a combined rubber rod is proposed to form a compound-cross-sectional prestressing conduit. This conduit presents a unique approach to addressing bleed water, and its effectiveness at preventing bleed water was studied. A full-scale grouting comparative test was conducted based on the prototype of a Chinese high-speed railway 32 m simply-supported box girder. Based on these test results, the characteristics of the generation, transmission and distribution of bleed water in conduits were investigated, and the relationship between the bend-up height and grouting compactness percentage (GCP) was analyzed. The test results showed that compound-cross-sectional conduits can separate the voids created by bleed water from prestressing steel to protect the tendons from corrosion. For horizontal and bend-up conduits in post-tensioned structures, the compound-cross-sectional prestressing conduits had much better bleed performance than circular conduits.

Keywords

post-tensioning grouting bleed full-scale grouting test compound cross-sectional conduit

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Experimental Study of Bleed Countermeasures for Post-Tensioning

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