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Durability of Post-Tensioned Structures Grout Specifications Durability Design Details

This informative guide explores the importance of grout specifications and design details in ensuring the durability of post-tensioned structures. Topics covered include corrosion protection, bond properties, fluidity, bleed control, and more. Learn the key elements to consider for a long-lasting and crack-resistant concrete duct grout system.

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Durability of Post-Tensioned Structures Grout Specifications Durability Design Details

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  1. Durability of Post-Tensioned StructuresGrout SpecificationsDurability Design Details

  2. Durability and Post-Tensioning moisture, Cl-, CO2 • Extremely durable when properly constructed • Crack control • Multiple protection levels concrete duct grout The grout is the last level of protection for the strand strand

  3. Purpose of Grout • Corrosion protection • Bond

  4. Properties • Fluidity • Bleed • Segregation • Set Time • Strength • Permeability • Volume Change • Corrosion Protection Bleed

  5. Bleed in Grouts Bleed • Bleed water is trapped in duct • Higher vertical rises = higher pressures and more bleed water • Strand promotes bleed by wicking Intermediate lense

  6. Bleed Lenses • Voids • Loss of protective environment 9 ¾” bleed column Intermediate lense

  7. Keys to a Good Grout • Completely fills duct • Low permeability • Appropriate bleed resistance • Careful use of admixtures Many admixtures help one grout property while degrading another

  8. Tasks under WO-81 • Literature review and summary of current practice • Development of specification language, details, and revisions to PennDOT publications • Scope includes • Grouting (materials, procedures, venting) • Durability details (anchorage, duct material) • Inspection/repair • Training of personnel

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