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Bridges Products April 29, 2015
 Mabey’s panel bridges & structural shoring reduce the duration of road closures/detours during bridge repair/replacement projects. The structural shoring provides temporary support for bridges under repair while keeping lanes open to traffic. Both can be used for falsework, bridge support...
Ice Control Products April 29, 2015
Cargill Deicing Technology offers two brine-making options to suit the needs and budgets of winter maintenance professionals. The AccuBatch brine maker and the AccuBrine automated brine maker can help municipalities and contractors save on time, costs and labor.   ·       Accurate, automated...
Products April 29, 2015
The Magma in three sizes -150, 230, 410-gal - with operator features for efficient crack sealing. AutoStart informs of ready-to-seal status with three green lights. Digital flow control provides smooth, even material flow. New “no drip” ergonomic sealant wand eliminates drips between crack sealing...
Products April 29, 2015
HCSS Mobile Mechanic­ allows equipment managers and mechanics to complete work orders and access construction equipment information directly from the field. The app works in conjunction with HCSS’s Equipment360 equipment maintenance software, which tracks equipment maintenance schedules for company...
Products April 29, 2015
StrataWeb provides three-dimensional soil reinforcement and solves problems associated with load support over soft soils, erosion on steep slopes and the linings of lagoons, drainage channels and landfills. Filled with granular material, the resulting cellular confinement system efficiently...
Safety Article April 28, 2015
Next year marks the 100th anniversary of the first stop-sign installation.   Not surprisingly, this innovation was developed and installed in Detroit. It was a rather simple device—the word STOP written in black on a white metal background. Over the next century a system of uniform rules, road-...
Safety Article April 28, 2015
Intelligent transportation systems (ITS) are being increasingly deployed in work zones to improve traffic operations and safety.   Also known as smart work-zone systems, these deployments provide real-time information to travelers, monitor traffic conditions and manage incidents. Despite numerous...
Safety Article April 28, 2015
It is just before 6 a.m. when you are awakened by the phone. Annoyed that someone would call you at such an early hour, you answer thinking, “what could be so important?”   Your world begins to spin when you learn your spouse has been killed by a motorist while working on a nearby roadway.  ...
Safety Article April 28, 2015
The most critical aspect of signal design and timing at an intersection is the development of an appropriate phase plan, which is mainly driven by left-turn treatments.   Accommodating and addressing left-turning vehicles is challenging for traffic engineers as they seek balance between...
Safety Article April 28, 2015
Rural, two-way-stop controlled intersections present a significant challenge for traffic safety.   For the 10-year period of 2002 to 2011 in Minnesota, 43% of all intersection crashes occurred at unsignalized intersections. However, for this same period, 65% of fatal and serious-injury intersection...
Safety Article April 28, 2015
As early as the 1920s highway agencies across the country started developing guidelines for uniform traffic signs. During that time—and pretty much ever since—the conventional thinking concerning nighttime visibility has been brighter is better.   That is because nighttime sign visibility has been...
Safety Article April 28, 2015
About an hour south of our nation’s capital, the historic former battlegrounds of Fredericksburg, Va., serve as the backdrop for the headquarters of a one-of-a-kind international roadway safety trade organization—the American Traffic Safety Services Association (ATSSA).   This assertive group of...
Asphalt Article April 28, 2015

VDOT’s modified EP-5 epoxy overlay waterproof membrane was placed on the travel and passing lanes of the SBL bridge on I-85.

Overlays are placed on bridge decks to reduce infiltration of water and chloride ions and to improve skid resistance, ride quality and surface appearance.   Hydraulic cement concrete (HCC) overlays used in Virginia include latex-modified concrete (LMC), first used in 1969, 7% silica fume concrete (...
Asphalt Article April 28, 2015

Figure 2. APA specimens before loading

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Figure 2. APA specimens after loading.

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Figure 3. Indirect tensile strength texting for AASHTO T 283.

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Figure 4. Laboratory scale asphalt binder foaming device.

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Figure 7. The University of Akron workability device.

Hot-mix asphalt (HMA) is the most commonly used material for asphalt-paving applications.   It is produced by drying the aggregates prior to mixing with the heated asphalt binder. The temperature at which this material is produced generally ranges from 300°F to 325°F for unmodified asphalt binders...
Asphalt Article April 28, 2015

If you speed up the drum and have the proper flights in the drum, you prevent the aggregate from dropping prematurely. This creates a better aggregate veil, which allows it to be heated better by the dryer. The technique translates directly to the roadway.

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“Everything looks good,” said Starling. “That was one of the easier FC-2 jobs I’ve been on. Once they started running, they never had any problems with the mix.”

Change is scary. But so are car accidents.   Along a stretch of U.S. 264 in central North Carolina, drivers had an extremely high risk for hydroplane accidents. To address the most dangerous areas, the North Carolina Department of Transportation (NCDOT) patched sections of the road with open-graded...
Asphalt Article April 28, 2015
In the mid-1990s the Louisiana Department of Transportation and Development (LADOTD) revised its hot-mix asphalt (HMA) mixture specifications.   Some of those major changes included requiring larger nominal maximum aggregate size in its aggregate structure and significantly reducing the amount of...
Asphalt Article April 28, 2015

In all, 232,000 tons of asphalt base and surface mixes were paved and compacted along the 6.2-mile stretch of Kentucky’s Highway 60.

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Antigo Construction Inc. fractured the 10-in.-thick concrete pavement prior to receiving the overlay to minimize the occurrence of reflective cracking.

The stretch of U.S. Highway 60 connecting Lexington to Kentucky’s capital, Frankfort, carries many high-profile commuters.   State lawmakers take the route for their work; celebrities can be spotted on their way to take in horse racing; and “many Kentucky Transportation Cabinet employees travel...
Asphalt Article April 28, 2015

The objective of this study was to evaluate how increasing the volume of virgin binder, using a softer grade of virgin binder or using a WMA chemical additive affected the durability and performance of RAP mixtures. 

Using reclaimed asphalt pavement (RAP) in asphalt mixtures can provide significant economic savings to contractors and highway agencies by reducing the demand for both the virgin binder and aggregates in asphalt mixtures.   Unfortunately, some highway agencies are reluctant to increase RAP content...
Asphalt Article April 28, 2015
Limited dollars must be spent wisely, and public agencies must ensure they are giving their customers—the driving public—the best performance possible for their tax dollars.   We in the asphalt industry are full partners in this effort. Last year, the National Asphalt Pavement Association (NAPA)...
News April 28, 2015
The Minnesota Senate passed a bill that will fund the state’s road and bridge repairs by raising the gas tax.  The newly approved bill would add 6.5% tax on fuel, which is expected to raise more than $400 million for 2016, and more than $6 billion over the next ten years.   Senate lawmakers voted...

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