ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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In early January 2012, the Nevada Department of Transportation (NDOT) lifted a new bridge on Interstate 15 (I-15) and slid it 60 ft into its permanent location in a matter of hours. T h e W e s t M e s q u i t e I n t e r c h a n g e was NDOT's first use of accelerated bridge construction (ABC) technology. With ABC, crews were able to build the 159.5-ft-long bridge (including approach slabs) in six months less time than with traditional methods and for millions of dollars less than the cost of a typical rebuild. The I-15 interchange was part of a $15 million project to widen Falcon Ridge Parkway in Mesquite, Nev., and to increase capacity for projected future traffic in the city (the original project estimate was approximately $ 2 5 m i l l i o n ) . T h e i m p ro v e m e n t s , which were completed in April 2012, widened the parkway, increased the bridge length, added roundabouts at interchange ramps, replaced 1200 ft of existing mainline pavement, and included new landscaping and lighting that creates a welcoming entrance to this popular tourist destination. ABC Conditions The interchange was in a prime location to accommodate Nevada's first bridge slide and fulfill the goal to reduce construction impacts on I-15. The following factors led to the decision to use ABC: • Ample land was available adjacent to the final location for building the bridges on temporary foundations. • There were no viable alternate routes. • Precast concrete components were available. • High traffic and freight volumes. • The location of the bridge at an interchange allowed interstate traffic to be routed down the ramps during the demolition of the existing bridges and the slide, avoiding any closures on I-15. • Traditional methods would have required significant I-15 traffic restrictions to construct the bridges. profile WEST MESQUITE INTERCHANGE AT I-15/ MESqUITE, NEVADA PRoGRAM MAnAGER: HDR Engineering, Omaha, Neb. BRIDGE DESIGn EnGInEER: Horrocks Engineers, Pleasant Grove, Utah GEoTECHnICAl EnGInEER: Intermountain GeoEnvironmental Services Inc., Salt Lake City, Utah SuRVEYoR: Forsgren, Mesquite, Nev. PRIME ConTRACToR: W.W. Clyde, Springville, Utah ConCRETE SuPPlIER: Sunroc Corporation, St. George, Utah PRECASTER: Hanson Structural Precast Eagle, Salt Lake City, Utah, a PCI-certified producer by Adam Searcy, Nevada Department of Transportation; Mike Dobry, Horrocks Engineers; and Laycee Kolkman, HDR Engineering Inc. West Mesquite Interchange at I-15 Aerial photo of West Mesquite Interchange following the I-15 southbound bridge slide. Photo: NDOT. NDOT 's First Bridge Slide Using Accelerated Bridge Construction 28 | ASPIRE , Summer 2012 P R O J E C T ASPIREBook_Sum12_R02.indb 28 6/29/12 12:39 PM

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