PTI M-50/ASBI JOINT TASK GROUP Specification for Grouted Post-Tensioning 2011 Update Presented By David Martin
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PTI M-50/ASBI JOINT TASK GROUP
Specification for Grouted Post-Tensioning
2011 Update Presented By
David Martin
The Group
The Mission & Goals
Why
The Process
Support & Reference Documents
History
Sticking Points – Tough Subjects
Where we go from here
OVERVIEW
• David Martin – Co-Chair (PTI M-50 Chair)
• Guido Schwager – Co-Chair (ASBI)
• Miroslav Vejvoda – Secretary
• Ted Neff – ex-officio (PTI)
• Randy Cox – ex-officio (ASBI)
• 31 Voting Members
• 3 Associate Members
.
THE JOINT TASK GROUP
Suppliers Contractors, Engineers, Research Consultants, Owners
THE JOINT TASK GROUP – OUR INDUSTRY
Develop and report on post-tensioned concrete structures with
bonded tendons.
MISSION
GOAL
Develop a national standard specification for bonded tendons
Set a minimum standard for all grouted post-tensioning
Define the design and testing requirements before a post-tensioning
systems can be used.
Give the owner/engineer a choice of performance levels in a post-
tensioning system.
Ensure the installed systems meet the approved system description.
Ensure the system is installed in a technically sound manner.
Ensure the durability goals will be achieved.
Give the suppliers an avenue for innovation beyond current best
practices.
Ensure that post-tensioned construction methods remain competitive.
Keep the specification as brief as possible.
GOAL IN DETAIL
WHY DOES THE INDUSTRY NEED A BONDED
POST-TENSIONING SPECIFICATION?
ENDLESS APPLICATIONS AND OPTIONS
APPLICATIONS from A..Z
Buildings, Concert Halls, & Dams
APPLICATIONS from A..Z
Bridges
APPLICATIONS from A..Z
Pavement & Runways
APPLICATIONS from A..Z
Viaducts & Walls
SYSTEM OPTIONS – Multi-Strand
SYSTEM OPTIONS – Single-Strand Bonded
SYSTEM OPTIONS – Threadbar
SYSTEM OPTIONS – Materials
Plastic Duct
Metal Duct
THE PROCESS
Collect input from committee members.
Collect and evaluate industry documents for consideration.
Prepare draft specification.
Collect comments from committee after initial review period.
Prepare and distribute 2nd draft.
Work through balloting process.
Publish and distribute specification.
Promote specification to industry.
DOCUMENTS UTILIZED IN THE PROCESS
PTI – Acceptance Standards for Post-Tensioning Systems
PTI – Specifications for Grouting of Post-tensioned Structures
AASHTO LRFD Bridge Construction Specification
FDOT Standard Provisions
MnDOT Standard Provisions
Caltrans Standard Provisions
Fib Bulletin 33 – Durability of Post-Tensioning Tendons
2007 M-50 Committee formed
2008 First meeting to discuss the base document for
specification development.
8/ 2009 M-50 established an ad-hoc joint task group with ASBI
with the joint interest of the standard specification
10/ 2009 Draft #1 of the specification
4/ 2010 Draft #2 of the specification
5-7/ 2010 Draft was balloted
May 1, 2011 Resolution of negative votes
HISTORY OF THE TASK GROUP
STICKING POINTS – TOUGH SUBJECTS
AIR PRESSURE TESTING OF TENDONS
Ideas of purpose were questioned.
Value gained in testing vs. cost
questioned.
Amount of pressure questioned.
STICKING POINTS – TOUGH SUBJECTS
SEGMENTAL COUPLERS
Industry wants the latest technology for increased durability.
Intent of specification is not to preclude any current systems available.
Future Goals
Establish a PTI Recommendations Document with commentary.
Focus on industry acceptance and promotion of specification.
Consider developing mechanism for national acceptance and
certification of individual proprietary systems.
Ensure the document always remains current with consideration for
the latest technologies.
WHERE TO GO FROM HERE
THE FUTURE IS POST-TENSIONED CONCRETE
NOT STEEL
Thank You
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