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Resurfacing with close-coupled paving
 Roadtec used the World of Asphalt show in March to
promote the concept of close-coupled paving, a mill-and-fill process
designed to reduce lane closure time, improve truck utilization, and
optimize paving quality and efficiency.
In traditional milling and overlay work, says
Roadtec, a lane is closed and the milling machines begin removing the old
pavement, filling haul trucks one by one with the tailings. The trucks haul
the tailings to an asphalt plant where they are recycled into a new mix.
When the mills are done, a truck sprays a tack coat on the milled surface,
then the paver goes to work, being fed by haul trucks from the asphalt
plant. Often times, says Roadtec, the haul trucks stack up waiting for
access to the paver, or the paver has to wait for the next haul truck.
Close-coupled paving seeks to avoid these
inefficiencies and reduce the amount of time lanes are closed through the
use of a material transfer vehicle, and when a tack coat is required,
Roadtec’s new spray paver.
In this scenario, the paving train closely follows
the milling machine so that trucks delivering hot mix can return to the
plant with tailings from the milling machine, dramatically reducing hauling
cycles for the project. The use of a material transfer vehicle makes hot-mix
delivery timing less critical by providing a storage buffer as well as
remixing. And a spray paver can lay the tack coat and the hot-mix lift in
one operation, eliminating damage to the tack coat from truck tires and the
consequent tracking of tack on existing pavement surfaces.
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Long-range accuracy
 Laser Reference is introducing two new automatic
grade lasers for grading and excavating contractors who need slope
capability, long range, and high accuracy. The Pro Shot AS2 and AS2 Magnum
replace the L1-AS and L1-AS Magnum and feature upgraded electronics,
improved battery life, and greater ease of service. They offer 0 to 25%
grade capability, long working range (2,000 feet for the AS2, 3,000 feet for
the AS2 Magnum), and high accuracy. The AS2 is accurate to within 3/32 inch
at 100 feet, while the Magnum is within 1/16 inch at the same distance.
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New 10-foot paver
 Caterpillar used the World of Asphalt last March to
introduce the new BG-260D 10-foot asphalt paver. The new wheel-driven model
features a Tier 3 engine and high capacity cooling system for improved fuel
efficiency and performance. Other standard features include dual operator
stations, three propel modes, and Cat’s proprietary material handling system
with independent feeder and auger controls.
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Improved two-way road machine
 Terex Roadbuilding has upgraded the paving mode of
the Terex|Cedarapids CR662RM Road Mix, a two-way road machine that can be
switched from a material transfer vehicle to a paver in a matter of hours.
As a paver, the machine now features new outboard-drive spreading augers and
a new-generation Remix System. Two 5-foot-long auger sections deliver
material to the left and right sections of the screed. Each auger section
has its own speed control so operators can independently adjust material
flow to either side of the screed. The augers back up to each other, so
there is no separation in the center. The new design eliminates the center
gearbox drive and the need for reversing augers, reducing occurrences of
centerline segregation, according to the company.
Along with the new augers, the Remix System has been
enhanced with two sets of two counter-rotating augers with interleafing
shafts that draw down material from all areas of the hopper and aggressively
reblend the asphalt. The company says the system virtually eliminates both
material segregation and thermal segregation.
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Upgraded GPS systems
Caterpillar has upgraded its satellite control and
guidance products with technology to use the L5 and L2C satellite
frequencies, as well as the GLONASS G1 and G2 signals. The upgrade will give
Cat’s products increased signal strength, better signal acquisition and
retention, improved initialization time, and better performance in difficult
environments, according to the company.
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Dusting with nanotechnology
U.K.-based MonoSol says it used nanotechnology to
create TerraLOC, a new dust abatement family of products. The water-soluble
compound is said to be biodegradable, environmentally friendly, easy to
apply, and quick to cure. A wide variety of conventional spraying equipment
can be used without modification, and it can be cleaned with water — no
solvents are needed. The product is said to act like a net, impregnating
unbound or un-compacted material like soil and sand that overlays the
subgrade to suppress dust.
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 Super-portable plant
Terex Roadbuilding has expanded its line of
low-load, super-portable counterflow asphalt plants with the introduction of
the 100-ton-per-hour E100P drum mix plant. The company says the plant sets a
new benchmark for portability by placing virtually everything a producer
needs to make mix on one portable chassis, including drum mixer, baghouse,
cold-feed bins, discharge and aggregate conveyors, scalping screen, and
control house. The E100P drum has a 5-foot, 11-inch diameter and is 25-feet,
10-inches long. It features Terex’ early entry RAP system.
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Briefs
Sterling Trucks has launched a Web site to help
municipalities select truck specifications for their specific applications. SterlingTrucks.com/MunicipalHQ includes how-to information and guidance for
building a truck for medium, heavy, or severe duty applications.
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Alamo Group, a market leader in several product
categories including mowing and street sweeping products, has acquired Gradall, the North American market leader in telescoping-boom excavators.
Alamo is retaining Gradall’s employees and production facility and has made
the operation part of its Industrial Division which includes mowing,
sweeping, road patching, and snow removal equipment.
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Liebherr celebrated the 35th anniversary of its
entry into the U.S. equipment market by raffling off a custom-painted Fat
Boy Harley Davidson motorcycle to a Liebherr dealer sales representative at
the recent Associated Equipment Distributors annual meeting. The winner,
Brian Smith of Tools 4 Hire in Boston, is seen here with, from left:
Liebherr president Duane Wilder; Tools 4 Hire president Herbert A.
Shaughnessy; Smith; and AED former president Toby Mack.
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New excavator series debuts
John Deere has introduced six models in its D-series
excavator line, ranging from the 54,244-pound 240D LC to the 185,520-pound
850D LC. Along with Tier 3 engines, the series makeover includes totally
redesigned cabs with dramatic increases in sight lines, more legroom,
shorter pilot controls, and fully adjustable suspension seats. Hydraulic
flow has been increased for more digging power and precise control, and
daily operating costs have been reduced with a series of designed in
features, including a 5,000-hour service interval on the hydraulic system.
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Faster re-mix pavers
Terex Roadbuilding has added larger propel pumps to
its CR400 and CR500 Series Remix Anti-Segregation Pavers to give them the
same speeds as their conventional slat conveyor counterparts. The larger
pumps give the Remix pavers a 35% increase in paving and travel speeds. In
addition, the Remix pavers have been modified to accommodate electric
screeds.
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 Balanced three-wheeler
Sakai calls its new R2H-1 a balanced three-wheel
roller. The 83-inch-wide static roller is designed to compact thin lifts,
city streets built over fragile infrastructure, and other pavement
situations in which vibration isn’t appropriate. Unlike old time three-wheel
static machines, Sakai says the wheels of the R2H-1 have the same diameter
and provide equal compactive force per linear inch; the machine develops 365
pounds of force per linear inch along its 83-inch rolling width. All three
wheels are driven, for optimum traction and minimal shoving, and water
ballast can be used to increase output forces.
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High-value 10-ton roller
 Stone Construction Equipment says its new 10-ton
Rhino SD66X vibratory soil compactor has the quality features of larger
machines at the price of a 5-ton model. The 110-horsepower roller has two
amplitudes and up to 22,500 pounds of compaction force, removable ROPS/FOPS,
extra large cooling system, and 45-gallon hydraulic and fuel tanks.
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Idle reduction technology
Volvo Trucks has been exhibiting trucks with mobile
idle reduction technology at spring trade shows this year. The MIRT system
reduces the need to idle trucks while providing drivers with electrical
power for comfort and non-driving needs such as air conditioning, lights,
and refrigerators. The MIRT systems include an onboard 120-volt generator
and shore-power electric lines.
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Compact truck chassis
Sterling has introduced a new low cab-over-engine truck, the Sterling
360. Features include high fuel efficiency, a large cab with easy ingress
and egress, and excellent maneuverability. Sterling designed the 360 for use
in construction applications, among many others.
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New engine brand name
International Truck and Engine has announced plans
to market its on-highway diesel engines under the brand name MaxxForce
International Diesel Power beginning in 2007. The line will range from a
four-cylinder 2.8-liter model to the company’s newest offerings in the 11-
to 13-liter class. International bills itself as maker of the world’s best
selling mid-range on-highway diesel engines.
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High-vibe utility roller
 Sakai used the World of Asphalt show last month to
introduce its new CR270, a 35.4-inch compact vibratory asphalt roller. The
new model features Sakai’s 4,000 vibrations per minute frequency for rapid
compaction rates.
Other features include hydrostatic, dual-drum drive,
high-capacity spray reservoir, spring-loaded adjustable scraper bars, and
articulated center-pivot steering.
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Moves more material
John Deere has introduced the J-series version of
its 26-metric-ton 950 crawler dozer that features a more powerful, Tier 3
compliant, 247 net horsepower engine that produces 6% more torque than the
previous model. The higher horsepower and torque are used to produce 28%
more drawbar pull, giving the 950J the ability to move more material in less
time. The hydrostatic drive machine is controlled by a single joystick and
features two drive motors dedicated to each final drive for improved
efficiency and steering power.
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Pneumatic rollers debut
 Bomag
has replaced its BW24RH pneumatic-tire roller
with two eight-tire models: the 99-horsepower BW24RH and the 131-horsepower
BW27RH. Both new models feature hydrostatic drive with infinitely variable
speed control up to 12 miles per hour, a two-point steering pivot on the
front four tires for smooth turning transitions, and enhanced maintenance
access. The BW24RH has a fully ballasted weight of 52,911 pounds. The BW27RH
has a top ballasted weight of 59,525 pounds.
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Reprinted from Better Roads Magazine
May2006 |
