Laserfiche WebLink
<br />1.0 Introduction <br />Several project areas are included in the 2017 Street Improvement project. The streets range in <br />function from local residential streets to local collectors. Each street was reviewed by Hakanson <br />Anderson and City staff to determine the current road and pavement conditions and to evaluate <br />the appropriate rehabilitation technique. A brief summary of each technique is discussed below. <br />1.1 Reconstruction <br />Reconstruction is considered when the pavement has failed and additional subgrade corrections <br />and/or drainage improvements are necessary. Complete reconstruction involves removing or <br />reclaiming the failed bituminous curbing and pavement, rebuilding the subgrade, constructing a <br />new aggregate base, drainage improvements, and construction of a new asphalt surface. The <br />drainage is improved with the addition of concrete curb and gutter and/or storm sewer. It is <br />often necessary to remove and replace portions of driveways to individual properties to complete <br />the work. Mail boxes are adjusted or replaced and a portion of the right of way adjacent to the <br />street is impacted. Reconstruction projects often have the longest time frames for completion. <br />1.2 Full Depth Reclamation (FDR) <br />Full depth reclamation is a treatment practice of reclaiming the existing bituminous pavement <br />into the underlying aggregate base. Full depth reclamation is effective when the pavement <br />surface exhibits moderate to severe transverse cracking, pattern cracking, or raveling. <br />Reclaiming the bituminous pavement into the underlying aggregate base creates additional <br />strength for the new pavement structure. After the road is reclaimed, the base is shaped and <br />compacted and a new bituminous surface is constructed. Failed sections of concrete curb and <br />gutter are removed and replaced to restore the drainage. <br />1.3 Bituminous Overlay <br />A bituminous overlay is considered when the pavement is in overall fair condition but has been <br />in-place for several years or has been subjected to repeated loading. In areas with concrete curb <br />and gutter, the edge of the bituminous is milled such that the new pavement elevations match <br />the existing concrete curb and gutter elevations. A bituminous overlay adds structural strength <br />to the pavement and extends the pavement life. <br /> <br /> <br /> <br /> <br />City of Elk River, Minnesota 1 | Page <br />2017 Street and Utility Improvements <br />