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- W641138962 abstract "Currently there is a serious problem in the United States and elsewhere with deteriorating concrete bridges. Historically, the problem has been associated with conventionally reinforced concrete bridge structures and not with bridges with prestressed or post-tensioned concrete members. In part, this situation may reflect the fact that there are more conventionally reinforced concrete structures in existence and that they have been in service longer. The oldest post-tensioned concrete bridge structures that use presently accepted technology are less than 25 years old. However, the consequences of corrosion of reinforcing steel in prestressed concrete structures are potentially greater than that in conventionally reinforced structures. This is because the structural integrity of the bridge relies on the high tensile loading of the strands, and loss of the strand could lead to catastrophic failure of the structure. It should be noted that a catastrophic failure has not yet occurred in the United States. The grout is the final line of defense for the steel tendon in the event the duct is breached. It is of interest to examine grout technology and practice, with a view to optimizing the ability of grouts to protect prestressed tendons against corrosion. The present review was carried out as the first step in achieving this objective. This review included open literature sources and contacts with industry and government agencies involved with bonded post-tensioned concrete construction as either a supplier, a user, a specifier, or contractor. Based on a review of the grouts used to date and on the current technology of additives developed primarily for use in concrete to reduce the permeability to chloride ions, the next generation of grouts could be improved in the following areas: (1) an increased resistance to chloride penetration, (2) an improved ability to inhibit corrosion if chloride ions penetrate down to the prestressed steel, and (3) improved rheological and emplacement characteristics for minimizing voids in the grouted ducts." @default.
- W641138962 created "2016-06-24" @default.
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- W641138962 date "1990-11-01" @default.
- W641138962 modified "2023-09-22" @default.
- W641138962 title "GROUTING TECHNOLOGY FOR BONDED TENDONS IN POST-TENSIONED BRIDGE STRUCTURES. INTERIM REPORT" @default.
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