Constructor - November/December 2016 - 25


BY DEBRA WOOD
FIXING AGING, STRUCTURALLY DEFICIENT bridges has become

a challenge for departments of transportation across the country.
The federal government reports about 58,495 bridges, carrying
nearly 204 million vehicles daily, are structurally deficient and
in need of repair. To keep those bridges functioning costs departments billions annually. Transportation departments, academics
and contractors are looking for solutions that will save funds and
ease the pain of closing bridges for repairs or reconstruction.
"These bridges being rated deficient are at a rate faster than
we can repair them, because we are limiting ourselves to oldfashioned repair methods," says Arash Esmaili Zaghi, PhD, PE,
assistant professor at the University of Connecticut in Storrs. "It's
time to move on to the next step and start using more advanced
materials and methodologies."

NOVEL REPAIR METHOD FOR CORRODED GIRDERS
Zaghi and colleagues at the University of Connecticut
Department of Civil and Environmental Engineering recently
completed a research project for the Connecticut Department
of Transportation, which maintains 4,182 bridges, that could
significantly reduce costs, time and lane closures.
Corrosion of the steel-girder ends at the bearing is one of the
most prevalent deficiencies on the nation's steel-girder bridges.
The damage can lead to failure. Traditional repair methods include
cover plates or adding steel shapes. Those methods require paint
removal, and due to the age of the bridges, that often means lead
paint and extensive abatement before any repairs can be made.
Then, crews must jack up the bridge decking, a significantly costly
and labor-intensive process that also disrupts traffic flow. Each
project requires a custom design because of different geometries.
During meetings with ConnDOT and UConn, an idea came
forward to encase the corroded web plate of beams or girders in
ultra-high performance concrete. The process includes welding
shear connectors to the girder and then pouring ultra-high performance concrete on the sides of the steel web. Zaghi's research
team came up with an experiment design to prove the concept
will work. They began with three large-scale tests performed
on intact, damaged and repaired girders.
The researchers report the repair successfully restored the
damaged girder's bearing capacity, saying, "The capacity of
the repaired girder exceeded the capacity of intact girder by
approximately 25 percent."
Ultra-high performance concrete is available in the marketplace. For the testing, UConn used Ductal JS-1212 designed by
Lafarge, a French company with U.S. offices in Chicago. It contains
"premix powder; water; Premia 150, a modified phosphonate plasticizer; Optima 100, a modified polycarboxylate high-range waterreducing admixture; Turbocast 650A, a non-chloride accelerator;
and steel fibers," with a diameter of 0.008 inches and a length
of 0.5 inches, according to the report by Zaghi to ConnDOT. The
mix flowed well and was self-consolidating. Zaghi indicated it is
nearly five times as strong as regular concrete and sets in 12 hours.
@Constr uctor Ma g

"In this repair method, two panels will be cast on the I-beam
to transfer the loads at the bearings of the bridge," Zaghi explains.
"This concrete is highly durable and strong; it transfers loads and
protects the base steel."
Zaghi indicates this repair can be completed during a weekend,
while the bridge remains open to light traffic.
The department received a $676,690 grant for the second
phase of the research, designed to address several technical
aspects to optimize the design and facilitate the implementation
of the repair. ConnDOT and UConn will soon field test this repair
methodology. They are narrowing down a list of bridges that
could be used as a pilot project.
"There is confidence this can be done," Zaghi says.
The American Association of State Highway and Transportation
Officials awarded ConnDOT a 2016 Sweet Sixteen award for
high-value, innovative research. More than 120 projects from
state-level departments of transportation vied for the recognition.
The system does not require original engineering for each
bridge. Zaghi estimates the state will be able to repair four to
five bridges with the new ultra-high performance concrete casts
for the same amount of money as one traditional bridge repair.
UConn will monitor the repaired bridges long term.
Neither Zaghi nor UConn have submitted a patent application,
because he says, the process should be available to the public.
"It can significantly benefit the safety of our bridges," Zaghi
says. "It is pretty exciting, because it is addressing one of the most
critical challenges we have with these aging bridges."

TOP-DOWN BRIDGE REPLACEMENT
When the Oregon DOT needed to replace the dual span Sandy
River Bridges on Interstate 84 at the gateway to the Columbia
River Gorge National Scenic Area without risking flooding of

For the first time in over a decade there is a
long-term authorization of federal highway and
transit programs in place following President
Obama signing the five-year $302 billion Fixing
America's Surface Transportation (FAST) Act into
law on Dec. 4, 2015. The FAST Act was a direct
result of the years of effort AGC members and their
employees spent convincing their representatives
and senators about the importance of a long-term
and well-funded transportation bill. Part of the
success could be contributed to the Hardhats
for Highways grassroots program as an integral
part of the industry's collective efforts on the
bill. Please visit the www.HardHatsforHighways.
org for an AGC overview of the FAST Act along
with other FAST Act resources.

N O V E MB E R / D E C E MB E R 2 0 1 6 | www.constructormagazine.com 25


http://www.HardHatsforHighways.org http://www.constructormagazine.com

Table of Contents for the Digital Edition of Constructor - November/December 2016

Editor’s Note
President’s Message
CEO’s Letter
AGC’s CM-BIM Credential Program Turns Five
Simonson Says
Cultivate, Innovate, Accelerate at AGC’s 98th Annual Convention
One School, One Instructor, One Student, You: A Workforce Development Campaign
In Good Repair
‘Must-Have’ Technology Tools
Technology Toolbox
Project Collaboration Starts at the Top
Connecting Community and Commuters
2016 Software Services Guide
Products & Services Marketplace
Index to Advertisers
Final Inspection
Constructor - November/December 2016 - cover1
Constructor - November/December 2016 - cover2
Constructor - November/December 2016 - 3
Constructor - November/December 2016 - 4
Constructor - November/December 2016 - 5
Constructor - November/December 2016 - 6
Constructor - November/December 2016 - Editor’s Note
Constructor - November/December 2016 - 8
Constructor - November/December 2016 - President’s Message
Constructor - November/December 2016 - 10
Constructor - November/December 2016 - CEO’s Letter
Constructor - November/December 2016 - AGC’s CM-BIM Credential Program Turns Five
Constructor - November/December 2016 - 13
Constructor - November/December 2016 - 14
Constructor - November/December 2016 - 15
Constructor - November/December 2016 - 16
Constructor - November/December 2016 - Simonson Says
Constructor - November/December 2016 - 18
Constructor - November/December 2016 - 19
Constructor - November/December 2016 - Cultivate, Innovate, Accelerate at AGC’s 98th Annual Convention
Constructor - November/December 2016 - 21
Constructor - November/December 2016 - 22
Constructor - November/December 2016 - One School, One Instructor, One Student, You: A Workforce Development Campaign
Constructor - November/December 2016 - In Good Repair
Constructor - November/December 2016 - 25
Constructor - November/December 2016 - 26
Constructor - November/December 2016 - 27
Constructor - November/December 2016 - 28
Constructor - November/December 2016 - 29
Constructor - November/December 2016 - 30
Constructor - November/December 2016 - ‘Must-Have’ Technology Tools
Constructor - November/December 2016 - 32
Constructor - November/December 2016 - 33
Constructor - November/December 2016 - 34
Constructor - November/December 2016 - Technology Toolbox
Constructor - November/December 2016 - 36
Constructor - November/December 2016 - Project Collaboration Starts at the Top
Constructor - November/December 2016 - 38
Constructor - November/December 2016 - 39
Constructor - November/December 2016 - 40
Constructor - November/December 2016 - 41
Constructor - November/December 2016 - 42
Constructor - November/December 2016 - 43
Constructor - November/December 2016 - 44
Constructor - November/December 2016 - Connecting Community and Commuters
Constructor - November/December 2016 - 46
Constructor - November/December 2016 - 47
Constructor - November/December 2016 - 48
Constructor - November/December 2016 - 49
Constructor - November/December 2016 - 50
Constructor - November/December 2016 - 2016 Software Services Guide
Constructor - November/December 2016 - 52
Constructor - November/December 2016 - 53
Constructor - November/December 2016 - 54
Constructor - November/December 2016 - 55
Constructor - November/December 2016 - Products & Services Marketplace
Constructor - November/December 2016 - Index to Advertisers
Constructor - November/December 2016 - Final Inspection
Constructor - November/December 2016 - cover3
Constructor - November/December 2016 - cover4
https://www.nxtbook.com/naylor/NGCS/NGCS0318
https://www.nxtbook.com/naylor/NGCS/NGCS0218
https://www.nxtbook.com/naylor/NGCS/NGCS0118
https://www.nxtbook.com/naylor/NGCS/NGCS0617
https://www.nxtbook.com/naylor/NGCS/NGCS0517
https://www.nxtbook.com/naylor/NGCS/NGCS0417
https://www.nxtbook.com/naylor/NGCS/NGCS0317
https://www.nxtbook.com/naylor/NGCS/NGCS0217
https://www.nxtbook.com/naylor/NGCS/NGCS0117
https://www.nxtbook.com/naylor/NGCS/NGCS0616
https://www.nxtbook.com/naylor/NGCS/NGCS0516
https://www.nxtbook.com/naylor/NGCS/NGCS0416
https://www.nxtbook.com/naylor/NGCS/NGCS0316
https://www.nxtbook.com/naylor/NGCS/NGCS0216
https://www.nxtbook.com/naylor/NGCS/NGCS0116
https://www.nxtbook.com/naylor/NGCS/NGCS0615
https://www.nxtbook.com/naylor/NGCS/NGCS0515
https://www.nxtbook.com/naylor/NGCS/NGCS0415
https://www.nxtbook.com/naylor/NGCS/NGCS0315
https://www.nxtbook.com/naylor/NGCS/NGCS0215
https://www.nxtbook.com/naylor/NGCS/NGCS0115
https://www.nxtbookmedia.com