powerpoint presentation · •scheduled (major areas of construction activity) •per special...

The Concrete Convention

and Exposition

ACI 301-16

Chapter 9 – Post-Tensioned Concrete

Miroslav Vejvoda, PETechnical & Certification Director Post-Tensioning Institute


and Exposition

ACI 301E Subcommittee Roster

1 Chair Larry Krauser General Technologies, Inc.

2 Voting Asit Baxi Suncoast Post-Tension, Ltd.

3 Voting Steve Close Jorgensen & Close Assoc., Inc.

4 Voting Charles Hanskat Concrete Engineering Group

5 Voting Neel Khosa Amsysco, Inc.

6 Voting Don Kline Kline Engineering & Consulting

7 Voting Frank Malits Cagley & Associates, Inc.

8 Voting Theodore Neff Post-Tensioning Institute

9 Voting Miroslav Vejvoda Post-Tensioning Institute

10 Voting Zuming Xia VSL

11 Ex Officio (NV) Michelle Wilson Portland Cement Association

12 Ex Officio (NV) James Cornell The Beck Group


and Exposition

Primary Subcommittee Goals

ACI 301E – Post-Tensioning

June 4, 2010

1.Review document for accuracy and consistency with industry

practices.

2.Review and resolve “Tabled” items from previous specification cycle.

3.Incorporate new PTI/ASBI M50.3 Grouted Post-Tensioning

Specifications upon publication.

4.Process specific requests from Main ACI 301 Committee as they arise.


and Exposition

ACI 301E Sequence of Work

Reviewed and reconciled Tabled Items

1. Identified sections for correction/consistency of industry

practices

2. Identified sections to incorporate PTI/ASBI M50.3 Grouted

Post-Tensioning Specifications

3. Provided Chapter to main committee for balloting

4. Main committee negatives (201 individual negatives, 158

resolved at meetings, 43 withdrawn)

5. Editorial modifications for overall consistency of ACI 301

6. TAC Comments

7. Public Comments (8 comments)


and Exposition

Major Modifications

Chapter 9 – Post-Tensioning

1. Clarified specifications for personnel qualifications

2. Incorporation of PTI/ASBI M50.3 Guide Specification to Grouted Post-Tensioning

3. Incorporation of PTI M55.1 Specification for Grouting of

Post-Tensioned Structures

4. Incorporation of new requirements of ACI 423.7 in regards to encapsulated post-tensioning tendons


and Exposition

Personnel Qualifications

Unless otherwise specified, personnel requirements per PTI Training and Certification for Field Personnel:• Scheduled (Major areas of construction activity)• Per Special Request (Any location; any time)• Available throughout the US and internationally• Available in English and Spanish (Unbonded PT)• Level 2 requires documented field experience• Certification valid for four years• Simple renewal


and Exposition

Requirements: Bonded PT

301-10 301-16

Installer PTI Level 1 Bonded PT – Field Installation

50% PTI Level 1 Bonded PT –Field Installation

Crew Foreman PTI Level 2 Bonded PT Field Specialist

Tensioning Personnel 50% PTI Level 2 Bonded PT Field Specialist

Remaining Personnel PTI Level 1 Bonded PT – Field Installation

Grouting Personnel “Trained and experienced in grouting”

PTI Level 1 Bonded PT – Field Installation

Immediate Supervision “Person skilled in grouting” PTI Level 2 Bonded PT Field Specialist / ASBI Grouting Tech

Inspection PTI Level 2 Bonded PT Field Specialist

Comparison of Requirements 2010 – 2016


and Exposition

Requirements: Unbonded PT

301-10 301-16

Installer PTI Level 1 Unbonded PT –Field Installation

50% PTI Level 1 Unbonded PT – Field Installation

Crew Foreman PTI Level 2 Unbonded PT Inspector or Ironworker

Tensioning Personnel 50% PTI Level 2 Unbonded PT Inspector or Ironworker

Remaining Personnel PTI Level 1 Unbonded PT –Field Installation

Inspection PTI Level 2 Unbonded PT Inspector

PTI Level 2 Unbonded PT Inspector

Comparison of Requirements 2010 – 2016


and Exposition

Reference to PTI/ASBI M50.3 (Grouted PT)

and PTI M55.1 (Grouting)

• Industry standards adopted by many DOTs.• Developed by a committee with controlled membership and

stakeholders from:

• Developed under the same ANSI consensus process ACI uses; with the exception of pubic review – All future editions will include public review as well.

PTI Standards M50.3 and M55.1


and Exposition

Reference to PTI/ASBI M50.3 Guide

Specification for Grouted Post-Tensioning

• Testing of bonded tendon components• Bonded tendon materials;

indicate Tendon Protection Level (PL)• Tendon tolerances (placement)

PTI Standards


and Exposition

Reference to PTI M55.1 Specification for

Grouting of Post-Tensioned Structures

• Grout quality control testing• Grout mixtures for bonded tendons

• Exception: Water soluble chloride ions content not to exceed 0.06% by mass of cement (ASTM C1218)

• Field trial tests• Field mockup tests

PTI Standards


and Exposition

• Major change in ACI 423.7-14: Encapsulated Unbonded

Tendon Materials

• All unbonded tendon materials used in structures designed

by ACI 318 or ACI 350 must be encapsulated.

• Exception: Nonencapsulated tendons allowed in industrial

slab-on-ground applications where specified.

New ACI 423.7 Requirements


and Exposition

Fixed-end anchorages

Wedge-type anchorage – temporary force to seat wedges:

• Strand pull method: 80-85% of Fpu• Strand push method: 85-90% Fpu• Wedges push method: 85-120% Fpu

Other Changes

powerpoint presentation · •scheduled (major areas of construction activity) •per special...

Documents