CSCE-Ryerson Lecture: Tuesday, December 7, 2010 from 6-9pm

CSCE Toronto Section is pleased Co-Host Seminar on:

NON-DESTRUCTIVE ASSESSMENT OF GROUTED PRESTRESS CABLE DUCTS IN POST-TENSIONED DECKS

TUESDAY, DECEMBER 7, 2010,
FROM 6:00 TO 9:00 P.M.

LECTURE ROOM ENG-103, FIRST FLOOR, GEORGE VARI ENGINEERING AND COMPUTING CENTRE,
RYERSON UNIVERSITY, 245 CHURCH STREET, TORONTO, ONTARIO M5B 2K3

ADMISSION IS FREE- PIZZA AND BEVERAGE WILL BE PROVIDED

To reserve a space, please respond by e-mail to: ksennah@ryerson.ca

Regards,

Peter Langan, P.Eng.
Chair, CSCE Toronto Section
c/o
R.V. Anderson Associates Limited
2001 Sheppard Avenue East Suite 400 Toronto ON M2J 4Z8
Tel 416 497 8600 Ext 301 Fax 416 497 0342
www.rvanderson.com
plangan@rvanderson.com

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Abstract: Post-tensioned concrete deck bridges have been in service in Ontario for more than 30 years. Many of them have been operating without any waterproofing/asphalt protection from their initial construction. Concerns currently exist as to the condition of the prestressing cables in the grouted ducts particularly in the negative moment regions where the cables are closest to the deck surface. Deterioration of post-tensioned bridge decks due to prestress cable corrosion is matter of considerable concern since the repair or replacement can be a costly process. As Ontario bridge infrastructure enters the era of maintenance, rehabilitation and replacement, there is a need to investigate/develop non-destructive methods of assessing the conditions of the grouted prestressing ducts and cables inside that require little or no invasive concrete work such as removal of concrete to expose the ducts for visual inspection. The seminar will start with a presentation of the recent German technologies (Remanent Mangantism (RM) and Impulse Thermography) for detecting voids in ducts as well as breaks in prestressing cables and strands. The seminar will also present results of a research program conducted at
Ryerson University on the use of GPR, Impact Echo, Half-Cell Potential and Shear Wave technologies on detecting voids and prestressed cable corrosion, as applicable. The seminar will conclude with an explanation of the use of vacuum grouting technology in filling the detected voids.

Seminar Schedule
6:00 -6:30 p.m. Registration, snacks and beverage - CSCE Ryerson Student Chapter
6:30-6:40 p.m. Introduction - Dr. Khaled Sennah and Dr. Bala Tharmabala
6:40-6:55 Case studies on locating ducts using GPR - Mr. David Redman
6:55-7:40 Application of Remanent Mangantism (RM) to detect prestressed cable break. Application of Impulse Thermography technologies to detect void in post-tensioned decks - Mr. Dave Whitman, Dr. Bernd Hillemeier, Mr. Andrei Walther
7:40-7:45 Use of Half-cell Potential in detecting corrosion of pretsessed cables - Mr. Hamidreza Khederzadeh
7:45-8:00 Recent research at Ryerson University on detecting voids using GPR, and Impact Echo technologies - Mr. Hamidreza Khederzadeh
8:00-8:15 Case studies on detecting voids - Mr. Garth Fallis
8:15-8:30 Advances in Impact Echo and future directions - Mr. Ron Grieve
8:30-8:40 Recent research at Ryerson University on detecting voids using Shear-Wave technology - Mr. Nabil Al-Bayati
8:40-8:50 Vacuum grouting of voids, DSI experience - Dr. Khaled Sennah
8:50 Concluding remarks Dr. Khaled Sennah