WVIK, Quad Cities NPR reported another phase of the I-74 Bridge project is complete. Read the full story and McCarthy Improvement’s involvement with the project here.
The Associated General Contractors of Iowa established the annual “Recognition of Safety Excellence Awards” (ROSE) to recognize contractor member companies who develop and implement excellent safety and loss prevention programs.
In order to be acknowledged as a top safety contractor, the following requirements must be met:
- Nominations should highlight outstanding achievements in the area of safety.
- Activities can include training, program development, innovative techniques or procedures or other activities, which promote or enhance safety awareness and/or achievement.
- Significant reduction in incidents, lowering the member’s Total Case Incident Rate (TCIR) and/or Days Away from work Restricted or job Transfer (DART) rates.
- The creation of incentives, awards and recognition programs or other noteworthy actions taken to enhance the member’s safety program.
McCarthy Improvement received a second-place ROSE Award in the Portland Cement Paving Division for contractors in the 100,000 – 400,000 work hours category.
“McCarthy Improvement considers our employees to be our most valuable assets; as such, we are dedicated to their protection,” stated Donna Said, Safety Manager of McCarthy Improvement. “The only way to achieve this is by ensuring that all employees, regardless of their position, are fully engaged in maintaining our proactive safety culture throughout the company. In addition, we have also developed a rigorous set of policies and procedures to prevent worksite incidents. We’re proud our safety program has been recognized by the IGC.”
The Associated General Contractors of Iowa is Iowa’s oldest and largest association of heavy/highway and municipal/utility contractors. AGC of Iowa represents hundreds of firms, including Iowa’s leading contractors and their service providers and suppliers. AGC of Iowa members are the “Public’s Partner in Building & Maintaining Iowa’s Highway, Bridge, And Municipal/Utility Infrastructure”. Visit the AGC of Iowa at www.agcia.org.
The American Concrete Pavement Association (ACPA) produces a quarterly publication called the Concrete Paving Progress to share industry news, project snapshots, best practices and networking events with its members. A project McCarthy Improvement was heavily involved in – NC I-85 Unbonded Overlay – was recently featured in the magazine, and ACPA graciously permitted us to share the following story on our website.
Accelerated Overlay Project Meets Demands From Increased Traffic
A $137 million rehabilitation of I-85 between Henderson, N.C., and the Virginia state line has greatly improved the ride for this heavily trafficked, 21.6-mile highway section.
The recently placed unbonded concrete pavement overlay has an expected design life of 30-plus years and is designed to meet the needs associated with higher traffic counts, including an increasingly high volume of truck traffic.
Originally paved in 1960, the 55-year-old roadway underwent a rehabilitation project in 2007 that focused on spall repair, slab replacement with asphalt, polymer patching of cracks and an overlay that kept traffic moving, albeit on a less than ideal pavement.
“The original pavement exceeded its expected life, but we were seeing slab failures, and we also needed to bring the entire corridor up to current design standards and create a pavement that can handle increasing truck traffic,” says E. Boyd Tharrington, P.E., Division Construction Engineer for Division 5 of the North Carolina Department of Transportation.
Over the last decade, truck traffic has increased steadily. This section of I-85 currently carries nearly 40,000 vehicles per day (VPD), with 23% of all traffic consisting of trucks. According to FHWA’s office of Freight Management and Operations, freight truck traffic is expected to increase by another 40% in the next 30 years, which will mean that I-85’s average truck traffic will be over 12,800 trucks per day.
The 10-in. unbonded concrete overlay is placed on top of an asphalt interlayer, says Adam Bruner, Carolinas Regional Manager for McCarthy Improvement, an ACPA member. “We paved over 80 lane miles—just over 21 miles of two northbound lanes and two southbound lanes,” he explains. Almost 662,200 SY of concrete was used, making it one of the largest unbonded concrete overlay projects in the southeast.
When this section of I-85 was first paved, standard design specifications called for 30-ft joint spacings with no dowel bars to transfer loads between slabs. “Now, the joint spacing is at 15-ft and dowel baskets were placed,” explains Bruner. The current design produces a pavement that can handle the expected volume and type of traffic expected in the future, he adds.
Although the concrete contractor was able to work on two-lane sections throughout the project, with traffic diverted to one lane each way on the other side of I-85, space in the work zone was tight. “Stringless paving was a lifesaver for us on this project,” says Bruner. “There were a number of operations in the work zone at one time, so there was no room for a stringline.”
“This was the first time stringless paving has been used in a project I’ve handled,” says Tharrington. “It provided a great advantage in access through work areas, getting material to the paver, and improving overall safety on the site.”
Although a constricted work zone is a challenge, the greatest challenge faced was the acceleration of the project schedule two years into construction. “One of our department initiatives is to identify major projects that can be accelerated when we have the funding to do so,” explains Tharrington. Because traffic could be diverted onto the opposite side of the interstate to keep it moving, the project lent itself to an accelerated schedule, he explains. “The original plan called for five-mile closures at a time, but the accelerated schedule allowed the entire 21-mile section of the southbound lanes to be closed—moving all traffic to a two-lane, two-way pattern in the northbound lane.”
Along with the extended work zone, the accelerated schedule also meant off-season paving, which required some adjustments for the cold weather, says Bruner. “In addition to using hot water for the mix, we also covered the pavement at the end of each day,” he explains. “This required an additional crew to blanket the concrete and we worked seven days a week.” During summer months, work continued at night, but during winter months, the temperature determined how late in the day crews could work, he adds.
Extending the work zone closure allowed for a more efficient paving operation and working throughout most of the winter months meant opening all lanes to traffic one year earlier than originally planned.
NCDOT specifications call for diamond grinding of concrete pavements to produce a better ride quality and reduce noise, but Tharrington points out that the combination of stringless technology and the ability to extend the length of work zones to allow continuous paving contributed to a high-quality product. He says, “The ride quality of this pavement is outstanding.”
The original article can be found here.
The American Concrete Pavement Association (ACPA) announced winners of its annual “Excellence in Concrete Pavements” awards. McCarthy Improvement received gold in the Industrial Paving category for the CSX Intermodal Terminals project located in Winterhaven, Florida.
Within three years of its initial construction, the Central Florida Intermodal Logistics Facility had outgrown its originally design capacity of 300,000 containers per year. As a result, an expansion project was required and included:
- construction of additional gantry cranes
- high mast lighting
- more than 13 acres of additional tractor trailer parking, loading and unloading areas
McCarthy Improvement was contracted to perform the concrete paving, which totaled 67,000 SY of concrete. The project specifications required a mix capable of attaining a compressive strength of 4,000 psi at 28 days. McCarthy Improvement developed a mixture that met the required strength in less than seven days, which helped expedite cure of adjacent paving lanes. The mix design included Type II portland cement, natural sand and granite coarse aggregates. Even though the granite was not locally available, McCarthy Improvement chose to “rail-in” granite aggregates from eastern Georgia and use them to improve early strength.
McCarthy Improvement completed the paving in 23 days of the 74 calendar days allowed from mobilization to the plant site. The owner previously had issues with roller compacted concrete and asphalt, so the finished project now stands as an excellent example of the versatility and durability of concrete pavements.
The article originally appeared on the ACPA website here.
The Greenwood County Airport is in line for a multi-million dollar upgrade, and it will only cost local leaders pennies on the dollar to see the work done.
The Federal Aviation Administration offers annual grants for local airports, and Greenwood usually gets about $150,000, used to fund projects identified within a County Council-approved capital improvement plan.
County Engineer Rob Russian said this year’s application was for the rehabilitation of the airport’s taxiways – a $2.3 million venture, about $700,000 more than initial estimates. That’s because dual bids were advertised, one for asphalt and another for the pricier concrete option.
Russian said work could begin by the end of this year, and Atlanta-based contractor McCarthy Improvement will take on the project.
The 110,000 SF cargo facility and its 17-acre apron allow the airport to accommodate up to three Boeing 747-8F aircraft simultaneously; tripling the airport’s previous handling capacity.