Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />. <br /> <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 />Murtuza Siddiqui <br /> <br />Copy: <br /> <br />Greg Brown/URS <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 Design <br /> <br />Virtually all streets owned and maintained by the City of Arden Hills are bituminous (asphalt) <br />roadways. Therefore, 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 tmcks, buses and garbage <br />tmcks. Pavement is designed considering three main factors; 1) pavement base, 2) pavement <br />surface and 3) drainage. With these factors in mind the following 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 are 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 portion of pavement design considers the underlying soil for strength and stability. The <br />gravel base thickncss 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 determines 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 />