Post-Tensioned Concrete
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 7
to Rev 8
in Post-Tensioned Concrete.
---
title: Post-Tensioned Concrete
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## Informational Submittals {toc}
−### Submit the following informational items: {note}
+### Submit the following informational items:
- Certified mill test reports for the prestressing strand (ASTM A416) or bar (ASTM A722), reporting the actual modulus of elasticity used to compute theoretical elongation.
- Jack and pressure-gauge calibration certificates from an accredited laboratory, dated within the calibration validity period (commonly six months or 1,000 cycles, whichever is sooner), with the jack and gauge calibrated as a unit.
…9 unchanged lines
- "Qualifications and certification of stressing and grouting personnel"
- "Post-tensioning supplier quality-control plan"
−default: [Certified mill test reports for strand (ASTM A416) or bar (ASTM A722) with modulus of elasticity, Jack and pressure-gauge calibration certificates (calibrated as a unit, within validity period), Qualifications and certification of stressing and grouting personnel, Post-tensioning supplier quality-control plan]
+default:
+ - "Certified mill test reports for strand (ASTM A416) or bar (ASTM A722) with modulus of elasticity"
+ - "Jack and pressure-gauge calibration certificates (calibrated as a unit, within validity period)"
+ - "Qualifications and certification of stressing and grouting personnel"
+ - "Post-tensioning supplier quality-control plan"
```
## Closeout Submittals {toc}
−### Provide the following at project closeout: {note}
+### Provide the following at project closeout:
- Stressing records for every tendon: the gauge pressure applied, the measured elongation, the calculated theoretical elongation, the percent difference, the wedge seating measured, and the date and personnel — reconciled and accepted by the Engineer.
- For bonded systems: grouting records for every duct, including grout batch, flow-cone time, bleed and set verification, injection pressure, the sequence of vents closed, and confirmation of complete fill.
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- "As-built tendon layout noting field-authorized modifications"
- "Warranty documentation"
−default: [Stressing records for every tendon (reconciled and accepted by the Engineer), Grouting records for every duct (bonded systems) with fill confirmation, Records of re-stressed, replaced, or variance-accepted tendons with evaluation, As-built tendon layout noting field-authorized modifications, Warranty documentation]
+default:
+ - "Stressing records for every tendon (reconciled and accepted by the Engineer)"
+ - "Grouting records for every duct (bonded systems) with fill confirmation"
+ - "Records of re-stressed, replaced, or variance-accepted tendons with evaluation"
+ - "As-built tendon layout noting field-authorized modifications"
+ - "Warranty documentation"
```
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### The corrosion protection required for the tendons is governed by the service exposure, and parking structures are the controlling case for buildings because their decks are exposed to chloride-laden water tracked in from deiced roads. {note}
+### ACI CODE-318-25 Chapter 19 exposure categories apply to the concrete, and the post-tensioning system's corrosion protection shall be selected to match.
+
```datasheet
label: Service Exposure of the Post-Tensioned Element
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```
−### ACI CODE-318-25 Chapter 19 exposure categories apply to the concrete, and the post-tensioning system's corrosion protection shall be selected to match.
−
### In C0 and C1 exposure, standard greased-and-sheathed unbonded tendons or standard grouted bonded tendons are adequate.
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min: 25
max: 45
− setpoints: [25, 30, 33, 35, 40, 44]
+ setpoints: [25, 30, 33, 35, 40, 44, 45]
default: 33
```
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### The encapsulated system creates a continuous, sealed envelope around the strand from end to end, with no point at which the strand is exposed to the environment. {note}
+### The level of corrosion protection of an unbonded tendon shall match the service exposure.
+
```datasheet
label: Unbonded Tendon Corrosion Protection Level
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```
−### The level of corrosion protection of an unbonded tendon shall match the service exposure.
−
### Encapsulated tendons shall be used for all tendons in C2 (chloride) exposure — most importantly parking structures — and are recommended wherever the tendon is exposed to moisture.
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# Concrete for Post-Tensioned Members {toc}
−## General {toc}
+## The concrete shall conform to [[sync/cast-in-place-concrete]] for its materials, mix design, placement, consolidation, and curing.
−### The concrete shall conform to [[sync/cast-in-place-concrete]] for its materials, mix design, placement, consolidation, and curing.
+## Two requirements specific to post-tensioning, the specified compressive strength and the concrete strength at stressing, are added in this standard. {note}
−### Two requirements specific to post-tensioning, the specified compressive strength and the concrete strength at stressing, are added in this standard. {note}
−
## Specified Compressive Strength {toc}
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# Grouting of Bonded Tendons {toc}
−## General {toc}
+## Grouting applies only to bonded multistrand systems. {note}
−### Grouting applies only to bonded multistrand systems. {note}
+## After the tendons are stressed and accepted, each duct shall be filled with cementitious grout that bonds the strand to the surrounding concrete and provides corrosion protection.
−### After the tendons are stressed and accepted, each duct shall be filled with cementitious grout that bonds the strand to the surrounding concrete and provides corrosion protection.
+## Grouting shall conform to PTI M55.1, Specification for Grouting of Post-Tensioned Structures.
−### Grouting shall conform to PTI M55.1, Specification for Grouting of Post-Tensioned Structures.
+## Incomplete grouting — leaving voids where air or bleed water was trapped — is the principal durability failure of bonded post-tensioning, because the ungrouted strand has no corrosion protection and the bond the design relied on is absent, and the voids are hidden inside the duct and cannot be detected after the fact without specialized testing. {note}
−### Incomplete grouting — leaving voids where air or bleed water was trapped — is the principal durability failure of bonded post-tensioning, because the ungrouted strand has no corrosion protection and the bond the design relied on is absent, and the voids are hidden inside the duct and cannot be detected after the fact without specialized testing. {note}
−
## Grout Material {toc}
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### The warranty shall not limit the Engineer's right to require corrective work for nonconforming conditions discovered during the warranty period.