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<br />URS <br /> <br />MEMORANDUM <br /> <br />Thresher Square <br />700 Third Street South <br />Minneapolis.. MN 55415 <br />Phone: (612) 370-0700 <br />Fax (612) 370.1378 <br /> <br />To; <br /> <br />MU!1uza Siddiqui <br /> <br />Copy; <br /> <br />Greg BrownfURS <br />Tom Moore/A. H. <br /> <br />File; <br /> <br />From; Nick Landwer, P.E, <br /> <br />Date; March 9, 2005 <br /> <br />Subject: Pavement Dcsign <br /> <br />Virtually all streets owned and maintained by the City of Ardcn Hills are bituminous (asphalt) <br />roadways. l1Jerefore, this discussion is based on the design and load characteristics of <br />bituminous pavement. Concrete roadways have different mechanical characteristics, are <br />constructed differently and for economical reason have a different design life. <br /> <br />It is commonly accepted that a 20-year design life for bituminous pavement is the most <br />economical in the state of Minnesota. In Arden Hills a 9-ton pavement design is used for <br />residential streets to account for heavier vehicles such as delivery trucks, buses and garbagc <br />trucks. Pavement is designed considering three main factors; l) pavement base, 2) pavement <br />surface and 3) drainage. With these factors in mind the folJowing information is used: <br />· The underlying soils are tested to determine the strength and stability properties. <br />. Traffic loading and the distribution of types of vehicles arc projected over the life of the <br />pavement. <br />. MnDOT design standards are and have been used on all new residential and commercial <br />road design in Arden Hills. <br /> <br />Pavement Base <br />This p0l1ion of pavement design considers the underlying soil for strength and stability. The <br />gravel base thickness is determined this way using MnDOT design charts. The gravel base is <br />the strength of the roadway and is designed to carry most of the traffic load. <br /> <br />Pavement Surface <br />The pavement surface is the bituminous portion of the road section and, although it does <br />contribute to the strength of the pavement, its primary purpose is to create a watertight and <br />smooth surface. The projected amount of traffic for a section of roadway dctcrmines the <br />pavement thickness and the aggregate and binder oils to be used in the bituminous mixture. <br />The binder oils used in Minnesota are typically designed to handle the extreme temperature <br />ranges experienced here. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />