Page 40 • February 24, 2010 • www.constructionequipmentguide.com • Paving Section • Construction Equipment Guide
SAKAI Unveils Sleek New 700 Series Double Drum Rollers SAKAI America’s new 700 Series vibratory asphalt rollers have a redesigned sleek look and increase paving productivity by achieving density with high amplitudes while leaving smooth finishes on all HMA surfaces. The 700 Series comes in two models, the SW770 and SW770HF. The SW770 offers one frequency, 3,000 vpm and two amplitude settings, low to high .012 to .025 in. (.03 to .06 cm), while the SW770HF offers three frequency settings up to 4000 vpm, and two amplitude settings, which are the same as the SW770. Both models offer a drum width of 67 in. (170 cm) and are ideally suited for a wide variety of HMA projects, including municipal streets, state highways, airport runways and large parking lots. The 700 Series is powered by a turbocharged, fuel-efficient Isuzu 4JJ1XDIA, water-cooled, Tier III diesel engine that delivers 123 hp (91.7 kW). Sakai’s fuel saver mode allows the operator to manually or automatically set the engine RPM depending on the application, while maintaining all of the vibration characteristics necessary for compaction and smoothness on the project. This mode is proving to have significant fuel savings, according to the manufacturer.
Sakai also has designed the 700 Series with a forward engine design and remote drains, making for easy engine serviceability. Mechanics can make quick oil and other fluid changes from the ground, which reduces roller downtime. The operator’s station, specifically the isolation deck of the 700 Series, is similar to Sakai’s other roller models but has been enhanced to minimize vibration
SAKAI America’s new 700 Series vibratory asphalt rollers come in two models, the SW770 and SW770HF.
edges from the operator’s seat. An optional side drum light offers added visibility during night paving. ROPS and seat belts are standard equipment on every Sakai roller sold in North America. Sakai’s ExactCompact and Intelligent Compaction, Compaction Information System (CIS) systems also are available as add-on features. Another feature on the 700 Series is Sakai’s spray system that eliminates downtime during the crucial The 700 Series provides 360 degree visibility plus an compacting stage. The spray enhanced view of the drum edges from the operator’s system consists of one spray seat. An optional side drum light offers added visibili- bar on each drum, rustproof ty during night paving. tanks, stainless pipes, and brass nozzles that can simply to the operator, which minimizes fatigue. The 700 Series also consists of a 3-position, be replaced by hand. The triple filtration sys180 degree rotating operator console with tem prevents clogging from debris and a instrument panel and seat. This design pressurized emergency back-up pump sysensures that all controls are easy to reach and tem provides water in the event of a pump gauges are easy to view no matter what posi- failure, according to the manufacturer. For more information, call 800/323-0535 tion the console is in. The 700 Series also provides 360 degree or visit www.sakaiamerica.com. visibility plus an enhanced view of the drum
Stringless System Stands Up to Stringent Series of Tests SCRUGGS from page 35
The new Portland cement concrete pavement is being slipformed by a GOMACO GHP-2800 fourtrack slipform paver. Each paving pass is 25 ft. (7.6 m) wide, 12 in. (30 cm) thick. A side-mounted bar inserter shoots No. 5 bars, 24 in. (61 cm) long, into the side of the slab at 18 in. (45.7 cm) intervals. “We like our GHP-2800 fourtrack,” Romaine said. “It gives us flexibility to tackle different types of projects, gives us a good ride, and allows us to pave more accurately.” A four-track Commander III is slipforming a 12 ft. (3.7 m) wide add-on lane on the project. It also is equipped to pave stringless. When Scruggs first started using the stringless system, it went through a series of onsite tests with personnel from GOMACO and Leica. Stringline also was set so a GOMACO Smoothness Indicator (GSI) could run behind the paver and provide real-time ride information during the testing. “It was important to me to have a GSI as part of the paving train
during testing,” Romaine said. “It obviously provided some excellent feedback, instantly, so we could make any necessary adjustments. “We were able to run the 3D model of the project through the GSI software so we could predetermine the best possible ride we could achieve. We discovered, because of the profile grades of the roadway and other factors, the best we could achieve on the IRI would Interstate 75 in Cook County is being widened from four to six lanes in parts of Georgia.
The concrete is a Georgia Class 1 mix with a size 57 stone and natural sand.
be around a 40. It’s interesting to be able to determine the best ride number you can possibly achieve, no matter what smoothness index you’re using.” The optional GSITools software gives contractors the ability to build a profile of the project to view various indexes and also estimated concrete yield before paving begins. A GOMACO T/C-600 texture/cure machine follows behind the paver applying a 0.375 in. (.9
cm) center-to-center horizontal tine and a white spray cure. Sonic sensors, steering off the side of the slab, guide the texture/cure machine. “I think the future for the stringless system is bright and we’re looking forward to learning more about the system’s true capabilities,” Romaine said. “We’ve gone Leica from bottom to top. We’re building subgrade, base, and now concrete.” Scruggs’ work on the I-75 project is scheduled for completion by mid-summer 2010. It will spend this summer paving the northbound side of the project, an additional 27 lane mi. (43.5 km), with its GOMACO paving train. “GOMACO is the best in the business, as far as I’m concerned,” Romaine said. “We get great service out of all the individuals at GOMACO, from their parts people to their engineers to their salesmen. We also get great performance from their equipment. The ease of setup and change-over for different paving widths saves us a lot of time and money.”