Finding ways to reduce aircraft maintenance costs is a critical step in saving money and time. This is especially true for the CV-22 Osprey, whose primary mission is the infiltration and exfiltration of special operations forces and cargo in austere locations. These locations frequently come with a lot of dust, which can cause a huge aircraft maintenance problem for the Osprey.
Because of its resemblance to Afghanistan, Melrose Air Force Range, located 20 miles west of Cannon Air Force Base, N.M., provides some of the most realistic training available to special operations forces. But the dust conditions there reduce engine flight hours to 140 to 250 as opposed to the designed 500 in normal conditions. Once the limit is reached both engines are removed from the aircraft and rebuilt — a maintenance cost of approximately $1.6 million a year. Due to these high costs, Air Force Special Operations Command tasked the 27th Special Operations Civil Engineer Squadron to engineer a solution — a low-dust landing pad — that could extend the lifecycle of the CV-22’s engines while maintaining realistic training on MAFR. Design While there are many commercial methods for dust control, none are capable of withstanding the intense heat of the CV-22 engine’s exhaust. Continue reading →
When a major contractor needed to rehabilitate several miles of the Chicago Transit Authority’s (CTA’s) rapid transit tracks, a Portable Modular Conveyor helped meet the important requirements of placing ballast along the track bed.
The project was part of Chicago Mayor Rahm Emanuel’s “Building a New Chicago” initiative. The CTA’s Red Line South Reconstruction Project involved rebuilding the 10.2-mile stretch from just north of Cermak-Chinatown to 95th Street. The 44-year-old line had exceeded its expected life and was plagued by slow zones and delays, according to the CTA. Five months later, the $425 million project—funded by the “Illinois Jobs Now!” program—delivered a brand new railroad to an estimated 80,000 daily riders. Continue reading →
If volatility in the steel market has you revising your bids too often, and if you’re interested in a Military-tested technology that’s poised to change the way concrete is installed forever, you owe it to yourself to stop by the ICF Concrete Additives’ booth and take a look at HiperLon, a fiber added to concrete that provides the flexural strength of rebar-reinforced concrete, without rebar!
“It was initially developed to make blast-resistant concrete,” said Mike Cook, Director of Sales for ICF Concrete Additives. “It’s really the first and only fiber on the market backed up with the technical data to prove it will replace rebar in precast and slab applications, and it’s now being used for full rebar replacement in one and two-story dwellings as well.”
HiperLon™ fiber was originally developed post-9/11 as a means of containing the fragments that came from explosions near concrete, according to Chief Technology Officer Mike Riley. When tested by the Army Corps of Engineers, the fiber contained the fragments and prevented them becoming flying debris.
“In testing an explosion near concrete using rebar, 40% of the concrete became airborne projectiles,” said Riley. “By putting the fiber in, it went down to 2%.”
The military application was obvious; the first parallel market ICF Concrete Additives brought the fiber to, was the petrochemical industry, where OSHA mandates man-occupied buildings be designed to meet certain blast safety criteria. The HiperLon™ approach, according to Riley, was the lowest-cost solution anyone had ever seen, and with all of the testing data verified by the petrochemical industry stalwart Baker Engineering and Risk Consultants, several companies on the Texas Gulf Coast (and municipalities) now use it exclusively to replace rebar.
HiperLon™ rebar replacement fiber makes perfect sense for places like the Gulf, or any place where corrosion is a concern, including underground tunnels and pipes. “If you can eliminate all or most of the steel in a concrete structure, you eliminate the biggest cause of corrosion and failure in the concrete,” said Riley.
The 3-inch long HiperLon™ fiber mixes beautifully, according to Riley, despite what many in the industry might have thought. “It can even be shot-creted,” he said, “to be used in in-ground swimming pools, replacing all the wire mesh and rebar that would be used in that application.”
ICF Concrete Additives has also done extensive impact testing, for applications that might include heavy equipment on slabs. A typical wire mesh concrete failed with a 100-pound weight dropped from about 24 inches, according to Riley; before they could produce a single crack in the HiperLon™ treated concrete they had to take a 350-pound weight dropped from 12 feet. That is more than 80,000 psi.
“We’ll have videos of all these tests at our booth,” said Riley, “as well as some of Special Forces guys placing explosives, unsuccessfully trying to make the concrete fail.”
For more information about ICF Concrete Additives and HiperLon™ fiber, visit Booth # N1813 at World of Concrete or visit www.icfconcreteadditives.com.
Overton Safety Training has been assisting employers make their workplaces safer (and meet regulatory requirements in the process) for decades, and has established itself as the premier safety training company in the West – to say nothing of becoming the training provider for a number of large employers such as Safeway, Allied Building Products and ABC Supply. Overton Safety Training will be at World of Concrete with an astounding bargain for anyone who uses forklifts, aerial and scissor lifts, or who rigs loads as part of their business: three 4-hour “train the trainer” classes lead by Overton Safety Training’s lead instructor, Rob Scherbarth, that will give employers the tools and qualifications they need to teach safety to their peers. Continue reading →
OCTOBER 22, 2013 – Sully-Miller Contracting Co. has transformed the way FiberMat®, a Colas Solutions Inc. pavement preservation process, is provided on the West Coast. In order to have a greater presence in the pavement preservation market, the FiberMat® machine is now being offered as a daily-operated equipment rental to pavement preservation contractors, emulsions suppliers, and local and state agencies that self-perform their own chip seal maintenance in the states where Sully-Miller is currently licensed: Nevada & California.
FiberMat® is a specially formulated, polymer modified, crack resistant membrane that produces superior strength and flexibility. It forms a high tensile matrix upon application with a highly modified asphalt emulsion residue that is reinforced with engineered fiberglass strands.
The FiberMat® system is installed by a specially developed machine that uniformly applies the fiberglass strands in a continuous application. The strands are sandwiched between two layers of modified emulsion prior to application of an aggregate cover. The final product is then rolled to seat the aggregate into the surface. This combination of highly modified asphalt residue and a fiberglass reinforcement matrix creates a powerfully resistant membrane interlayer that absorbs stresses in the pavement structure and delays the onset of cracking. Continue reading →
All American Asphalt (Corona, CA) recently completed a ramp overlay project for Caltrans near Los Angeles, CA. The project included the overlay of several ramps on the Interstate 405 corridor just south of the LAX International Airport. The paving occurred at night to minimize the disruption to the travelling public, approximately 300,000 Average Annual Daily Traffic or AADT. A late season rain storm delayed the project a couple of days and lowered overnight temperatures to the 50’s. Even so, All American Asphalt achieved proper compaction with minimal placement issues.
Caltrans identified this project as a “pilot” for their evaluation of thenew Superpave specification, which they plan to implement in 2014 in lieu of the Hveem mix design process. This project was the first to include a Superpave mix design for a mix that includes Asphalt Rubber by incorporating 20% ground tire rubber. Continue reading →
West Coxsackie, New York – (Oct. 9, 2013) –– On Oct. 3, The PCA Rocky Mountain Region, Colorado/Wyoming Chapter of the American Concrete Pavement Association and the International Grinding & Grooving Association (IGGA) co-hosted an open house on concrete pavement preservation (CPP) in Highlands Ranch, Colo. The open house featured a site tour of one of the largest CPP projects to ever have been undertaken by a county entity.
The CPP project was carried out across various arterial and collector roadways throughout Highlands Ranch in Douglas County. The urban location, which included area businesses and local access to homes, made for a unique set of challenges. While the Federal Highway Administration, along with various state Departments of Transportation (DOTs), have well-established processes in place for CPP, local governments often have limited experience with state-of-the-art CPP methods. It is therefore of critical importance that when local governments embark upon preservation efforts, they manage the process carefully. The Douglas County Department of Public Works Engineering in Colorado achieved success by inviting industry members to weigh in early and establishing a firm plan before work got underway.
West Coxsackie, New York – (September 27, 2013) –– The federal government recently issued a new policy clarifying ADA curb ramp requirements for pavement alterations. As a major industry resource on pavement rehabilitation and restoration, the non-profit trade association International Grooving & Grinding Association (IGGA) is providing its members with guidance on this new information. “The development of this single federal policy should make it easier for roadway specifiers to determine the most effective and economical course of action when servicing their pavements. It will certainly make it easier for them to specify diamond grinding, dowel bar retrofit, resealing and other concrete pavement preservation treatments without the need for costly ADA alterations.” Continue reading →
Phoenix Industries announced today the successful completion of the first trial project with their new PelletPAVE Plus™ pelletized rubber modified binder. Approximately 150mix tons of the rubber modified hot mix asphalt was produced and placed in Pahrump,Nevada.
Continue reading →
Templeton Paving reached for Evotherm warm mix asphalt technology for their resurfacing job on Hwy 56 near Amherst, VA. Nustar Energy terminally blended the Evotherm into the asphalt used for the surface mix of 5.7% total AC and 25% RAP. Templeton Paving produced the mix in their Gencor drum plant at a mix temperature of 270⁰F with baghouse temperatures around 220⁰F throughout the day. Temperatures behind the screed consistently measured 260⁰F.
All cores were above the specification of 92.0% with densities reading 93-94%.The QC manager was pleased with both the mix and density numbers, wanting to lower the mix temperature further throughout the remainder of the project.
Author: Ryan Bragg