Emulsified Base FDR

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CONTACT INFORMATION 
651.490.4650

Tom Wesolowski, City Engineer

Phone: 651.490.4652 | E-mail Tom W.

Problem

Prior to 2007, the City’s strategy for rehabilitating residential asphalt street sections consisted of milling the existing asphalt in place, and placing 3-1/2” of new asphalt over the milled base. Typical residential sections usually consist of a 6-inch granular base with 2 or 3-inches of asphalt. This strategy did provide a new driving surface but was prone to reflective cracking after a few years as subgrade defects weren't addressed.

Solution

Beginning in 2007, Shoreview's rehabilitation method for residential streets switched to Full-depth reclamation (FDR). The existing asphalt road surfaces are reclaimed to a depth of 6-inches, graded, compacted, and excess material removed when needed. The reclaimer then injects and mixes the asphalt emulsion into the reclaimed base to a depth of 6-inches. The emulsified base is then compacted, graded, and compacted with a steel wheel roller. Once the emulsified base has cured and reached the specified moisture content, the 2-inch layer of asphalt is typically placed.
 
Observations of Shoreview streets rehabilitated with this method have noted a dramatic reduction in pavement distresses, including reflective cracking, and the City anticipates longer service life for these streets. The method also ensures that at no times during the FDR process are the streets closed to traffic, which minimizes inconveniences to residents and service providers. Based on excellent results since 2007, the City is using FDR as its standard residential asphalt pavement rehabilitation method.