Better Roads

August 2014

Better Roads Digital Magazine

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Better Roads August 2014 9 "In general, the control mixes resulted in lower perfor- mance scores compared to the new mixtures," Son and Al-Qadi. "The 4.75-mm SMA section with a 1-inch wearing surface provided the highest overall performance score." Stress-absorbing membrane interlayer In Washoe County, Nevada, County Highway 447 was im- proved by cold in-place recycling, placement of a fi ber- reinforced SAMI, and fi nished with a Type III slurry surfacing as the fi nal wearing surface instead of a costly total reconstruc- tion. "With fuel prices going up, we are seeing a lot more truck traffi c on 447," says Bill Gooch, road supervisor, County of Washoe Road Division, Gerlach, Nev. "It's a short cut; one truck driver told me taking 447 saves him three hours driving from Portland or Seattle to Phoenix or Las Vegas." Make precision application a reality with the Hi-Way ® Xzalt ® . Featuring a unique directional spinner, the Xzalt allows operators to broadcast a 70:30 ratio of dry/liquid material precisely on one, two, or three lanes all from the convenience of the cab. The mixed material delivered produces less bounce and improves road adhesion, virtually eliminating over-application on roadside shoulders. The Xzalt also allows operators to achieve higher application speeds and maintain longer routes with fewer spreaders, improving their return on investment (ROI). ÊnääÎÈΣÇÇ£ÊUÊÜÜÜ°}Ü>ÞiµÕ«iÌ°VÊÊUÊ^ÊÓä£{Ê}Ü>ÞʵիiÌÊ «>Þ°ÊÊÊÀ}ÌÃÊÀiÃiÀÛi`°Ê Determine your ROI with the Xzalt by becoming a VIP at 7H[W,1)2WRRUYLVLWZZZEHWWHUURDGVFRPLQIR In Illinois thin-lift asphalt study, only stone matrix asphalt (SMA) mixes scored higher in overall performance than steel slag/polypropylene-aramid fi ber blend with PG 70-22, SBS-modifi ed asphalt cement Photo courtesy of Songsu Son and Imad L. Al-Qadi

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