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5.5.3.3. Coupon Testing and half- cell potential measurements of reinforcement
Coupon testing and half- cell potential measurements of reinforcements are installed at regular
intervals during MSE wall construction. The North Carolina Department of Transportation began
installing this type of monitoring approach during construction in 1990s. Zinc bars and steel
plate coupons were installed, and reinforcements were wired for half- cell potential measurements
at each monitoring station along the wall. Withiam et al. ( 2002) provided details on corrosion
measurement at several sites in North Carolina and California based on this approach.
5.5.4. Summary
It is clear that integration of corrosion measurements with time to asset management of metallic
components of earth structure is needed. Withiam et al. ( 2002) provided a conceptual framework
for integrating corrosion performance measurement within a database of mechanically stabilized
walls. Such framework can be streamlined into a broader GAM system for comprehensive and
economically reliable management of metallic reinforcement.
5.6. Retaining Walls
A scan of literature, however, clearly shows a lack of a structured and widely accepted system
for management of walls as a highway asset. Retaining structures support many of the highway
assets. As such, the development of an asset management system for retaining structures is an
emerging concept. Anderson et al. ( 2008) developed a system for wall Inventory Program ( WIP)
to support effort underway in the National Park Service. The purpose of the system is to manage
maintenance and replacement cost of earth retaining structures. An inventory system for
retaining walls and sound barriers was presented by Hearn ( 2004). The system included
information about location, age, type, dimensions, and condition of the wall. The authors
presented the application of linking the inventory system with a maintenance management
program. It is of interest to note that Robert et al. ( 2006) indicated that noise walls and other
structures are now included in the “ Pontis” bridge management system. This is a positive
development as a GAM component ( noise walls) is integrated into a broader highway asset
management system. The development of a systematic means for condition assessment and
cataloging of all highway retaining structures in a sustainable manner will represent a major
contribution an asset management system.
5.6.1. Wall Data Collection
In conjunction with the conference activities, four retaining walls located around Research
Triangle Park in North Carolina were selected for demonstration of a system for inventory and
condition assessment of walls. Each of the four walls is a part of a bridge abutment structure.
The wall locations are as follows:
At the interchange of NC 98, Wake Forest Bypass, from west of US 1 to west of US 1A
( designated as US1/ NC98 wall),
• At the interchange of I- 85 from west of Canden Avenue to east of Midland Terrace and
0.8 miles south of Cheek road on US- 70 ( designated as US70/ I85 wall),
• At the intersection of US 147 at Hillandale street in Durham city ( designated as US147
Hillandale wall), and
• At the intersection of US 70 at Aviation Parkway and Westgate road in west of Raleigh
city ( designated as US47 Westagate wall).
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| Title | Asset management inventory and data collection : final report - Page 169 |
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| Full Text | 155 5.5.3.3. Coupon Testing and half- cell potential measurements of reinforcement Coupon testing and half- cell potential measurements of reinforcements are installed at regular intervals during MSE wall construction. The North Carolina Department of Transportation began installing this type of monitoring approach during construction in 1990s. Zinc bars and steel plate coupons were installed, and reinforcements were wired for half- cell potential measurements at each monitoring station along the wall. Withiam et al. ( 2002) provided details on corrosion measurement at several sites in North Carolina and California based on this approach. 5.5.4. Summary It is clear that integration of corrosion measurements with time to asset management of metallic components of earth structure is needed. Withiam et al. ( 2002) provided a conceptual framework for integrating corrosion performance measurement within a database of mechanically stabilized walls. Such framework can be streamlined into a broader GAM system for comprehensive and economically reliable management of metallic reinforcement. 5.6. Retaining Walls A scan of literature, however, clearly shows a lack of a structured and widely accepted system for management of walls as a highway asset. Retaining structures support many of the highway assets. As such, the development of an asset management system for retaining structures is an emerging concept. Anderson et al. ( 2008) developed a system for wall Inventory Program ( WIP) to support effort underway in the National Park Service. The purpose of the system is to manage maintenance and replacement cost of earth retaining structures. An inventory system for retaining walls and sound barriers was presented by Hearn ( 2004). The system included information about location, age, type, dimensions, and condition of the wall. The authors presented the application of linking the inventory system with a maintenance management program. It is of interest to note that Robert et al. ( 2006) indicated that noise walls and other structures are now included in the “ Pontis” bridge management system. This is a positive development as a GAM component ( noise walls) is integrated into a broader highway asset management system. The development of a systematic means for condition assessment and cataloging of all highway retaining structures in a sustainable manner will represent a major contribution an asset management system. 5.6.1. Wall Data Collection In conjunction with the conference activities, four retaining walls located around Research Triangle Park in North Carolina were selected for demonstration of a system for inventory and condition assessment of walls. Each of the four walls is a part of a bridge abutment structure. The wall locations are as follows: At the interchange of NC 98, Wake Forest Bypass, from west of US 1 to west of US 1A ( designated as US1/ NC98 wall), • At the interchange of I- 85 from west of Canden Avenue to east of Midland Terrace and 0.8 miles south of Cheek road on US- 70 ( designated as US70/ I85 wall), • At the intersection of US 147 at Hillandale street in Durham city ( designated as US147 Hillandale wall), and • At the intersection of US 70 at Aviation Parkway and Westgate road in west of Raleigh city ( designated as US47 Westagate wall). |
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