Inspection Guidelines for Bridge Post-Tensioning and Stay Cable Systems Using NDE Methods (2017) / Chapter Skim
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Pages 12-18
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From page 12... ...
12 Deterioration Conditions Introduction When PT concrete bridges are properly designed and constructed, they may prove to be the most durable bridge type, also requiring the least amount of maintenance (Clark 2010)
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13 spheric corrosion, pitting corrosion, crevice corrosion, stress corrosion cracking, hydrogen cracking, corrosion fatigue, and electrolytic corrosion (Elliott and Heymsfield 2003)
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14 in internal/external tendons and metal/nonmetal ducts. In addition, it also provides the specific accuracy levels for the NDE methods that successfully detect corrosion defects.
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15 occurrence of fretting fatigue and later breakage (Wollman et al.
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16 proper bonding does not occur and other detrimental conditions such as water infiltration can follow. This can eventually lead to the corrosion of strands.
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17 commonly an issue in vertically angled tendons, such as stay cable MTEs, is bleed water. Bleed water is typically caused by poor mixing, poor materials, or excessive water in the grout, but is essentially the formation of a water pocket that forms at the highest point of the grout as the particles settle downwards and force the water upwards.
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From page 18... ...
18 be thoroughly examined during bridge inspections. Sealed ducts in the anchorage zone are vital to protect the steel tendons.
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