November 5, 2014
September 20, 2013
Slayen/Sundt poured 1,420 cubic yards of concrete at pier 5 – a key milestone in the 47-month project.
The Sellwood Bridge project in Portland, Oregon achieved two important milestones last month when Sundt and joint venture partner Slayden Construction placed nearly 3,000 cubic yards of concrete at the foundations of piers 4 and 5, located in the Willamette River. The concrete pours represent significant achievements in the 47-month, $216 million project to replace the aging bridge with a new structure that is wider, safer and seismically sound.
Discharge water cascades from the cooling system the team developed to control the temperature of the concrete as it cured.
The concrete milestones also represent impressive accomplishments in value engineering and ingenuity. Piers 4 and 5 are massive concrete structures comprised of reinforcing steel and 6000 psi concrete. Slayden/Sundt’s own workforce used specialized concrete placement techniques to control the excessive – and potentially damaging – heat that was created during the curing process.
An up-close look at the cooling system’s water tubes, manifold and valves
“As fresh concrete hardens, or ‘cures,’ heat is generated as a byproduct of the chemical reaction,” explains Sundt Project Engineer Matt Fisher. “Due to the very large mass of concrete at piers 4 and 5, this ‘heat of hydration’ is generated faster than it can naturally dissipate, which could result in excessive internal temperatures and possible damage to the concrete.”
As a solution to this problem, the team designed an internal water-cooling system to remove the excess heat from the concrete. Water pumps, manifolds, intake screens, valves, flow meters and thousands of feet of flexible plastic water tubing were carefully placed throughout the concrete formwork. After the concrete was placed at the piers, cool water was continuously pumped through the plastic tubes, which in turn carried away the excess heat from the concrete. Remote temperature sensors were also placed throughout the fresh concrete to collect temperature data. As the concrete cured, and the internal temperatures climbed, this data was constantly monitored to confirm the performance of the cooling system and to ensure a quality product.
Artist’s rendering of Sellwood Bridge as it will look when it’s complete in 2016
May 29, 2013
Sundt recently presented its Lifetime Achievement Award to Mike Mahoney, a general superintendent who worked on the company’s federal government construction projects before retiring earlier this month.
Mike, who started with M.M. Sundt as a concrete finisher, worked on a wide range of projects across the United States for more than 40 years. His contributions to Sundt were acknowledged during the company’s Annual Leadership Conference, where 100 of the top senior management gathered.
This is only the third time in Sundt’s 123-year history that the Lifetime Achievement award was presented.
March 6, 2013
An aerial view of the reconstructed Cordes Junction Traffic Interchange
Sundt and joint venture partner Vastco, Inc., have nearly completed reconstructing the Cordes Junction traffic interchange, located about 65 miles north of downtown Phoenix at Interstate 17 (I-17) and State Route 69. Traffic has been placed into its ultimate configuration to prepare for the final lift of rubberized asphaltic concrete pavement. Crews are currently scheduled to pave the project during the month of June followed by final striping and signage. The project is expected to be complete in July.
The Construction Manager at Risk project included the construction of seven new bridges, including a post-tensioned, cast-in-place concrete structure that was built over live traffic on I-17. The Heavy Civil team also built two separate interchanges – one for through traffic and one for local – and realigned, widened and paved several streets. The 50-year-old interchange is used by approximately 40,000 vehicles per day.
December 17, 2012
Practice missions can be analyzed from one of DAGIR’s observation towers, like the one pictured above.
Sundt has completed the U.S. military’s first fully computerized target practice range at Fort Bliss Army Post, Texas: a high-profile project called DAGIR, which stands for Digital Air-Ground Integration Range. The facility will be used to train U.S. soldiers and the armies of several U.S. allies for combat missions on the ground and from the air.
What makes the range unique is the fact that the targets are controlled digitally, which allows for the creation of unlimited combat scenarios. Sensors in the targets and the vehicles gather information that then becomes part of the review and feedback process. After soldiers complete a simulated mission on the range, they return to the After Action Review (AAR) building to view a recording and debrief with their superiors.
The $32 million heavy civil construction project included construction of 23 miles of tank trails, installation of 200 pre-cast concrete targets, and construction of six support buildings. The targets required approximately 11,000 concrete blocks, all of which were made by Sundt’s Concrete Division using an efficient assembly line approach that boosted productivity rates by more than 30 percent over what was originally projected.
Preparing the site for the Bill of Rights Monument took about a month. Sundt’s concrete team, shown above, poured and finished the foundations for each of the ten limestone slabs.
Arizona is home to the country’s first Bill of Rights Monument, and Sundt played a key role in making it happen. The stone monument, which was dedicated last weekend, is made up of 10 limestone slabs arranged on a grassy hill overlooking the State Capitol in Phoenix. Each bears a unique carved image and words from the individual amendments to the U.S. Constitution that make up the Bill of Rights. (More about the six-year effort to get the monument funded and approved can be found in this New York Times article.)