Laserfiche WebLink
City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 15 <br />C.3.e. Miscellaneous Bituminous Recommendations <br />When placing new pavement next to in-place pavement, we recommend providing a full-depth sawcut to <br />ensure a uniform joint. <br />We recommend tack coat between all bituminous layers and prior to placing any bituminous mixtures on <br />existing pavement in accordance with MnDOT Specification 2357. <br />C.4. Mill-and-Overlay <br />We recommend milling the pavements for Karth Lake Circle in accordance with MnDOT Specification <br />2232. The mill depth will vary based on conditions encountered but should be a minimum depth of <br />2 1/2 inches. Following the milling, place a 2 1/2-inch bituminous overlay meeting bituminous wear <br />course mix SPWEA340B (MnDOT Material Specification 2360). Pavement depth can vary between the <br />boring and core locations. The contractor may need to adjust the mill depth to account for unexpected <br />conditions such as areas of thin pavement. <br />The surface condition prior to milling can indicate where deeper repairs to the milled surface may be <br />necessary to improve the life of the overlay. This includes distresses such as severe longitudinal and <br />transverse cracking, alligator/fatigue cracking of any severity, potholes, edge cracking, and similar <br />failures. MnDOT defines these distresses in their surface rating procedure as follows: <br />▪High-severity transverse cracking: Any crack running transverse to the centerline of the <br />roadway with significant adjacent random cracking (12 inches or more apart), have large <br />areas of spalling, missing material and/or potholes. <br />▪High-severity longitudinal cracking: Any crack running parallel to the centerline of the <br />roadway with significant adjacent random cracking (12 inches or more apart), large areas of <br />spalling, missing material and/or potholes. <br />▪Alligator cracking: A series of interconnected cracks forming many-sided, sharp-angled <br />pieces, 6 inches or less in size, typically located in the wheel paths and under concentrated <br />traffic loads. <br />We recommend an experienced engineer walk the milled surface to delineate areas for these repairs <br />based on conditions exposed by the milling process. We recommend performing the full-depth mill to at <br />least 1 foot beyond the edge of the visible distresses where present.