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CC_Minutes_2015_0413
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Roseville City Council
Document Type
Council Minutes
Meeting Date
4/13/2015
Meeting Type
Regular
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Regular City Council Meeting <br /> Monday,April 13, 2015 <br /> Page 19 <br /> City Engineer Marc Culver provided a presentation to the City on the current <br /> pavement indexing system, the City's Pavement Management Plan (PMP) and is- <br /> - sues found in Roseville and around the State of Minnesota with delamination of <br /> the pavement on local roads. <br /> Mr. Culver reviewed current pavement maintenance strategies with review using <br /> the Pavement Condition Index as a model, whereby roads were periodically rated <br /> and inventoried for cracks, potholes and other distresses; and their condition cal- <br /> culated and rated using the index. Mr. Culver advised that the condition index <br /> was continually projected based on the last rating, time elapsed, and maintenance <br /> history tracked. Using current indexing, Mr. Culver advised that the budget al- <br /> lowed for rating approximately 13 miles per year, and it takes approximately 10 <br /> years to rate local roadways throughout the entire community. <br /> Mr. Culver reviewed the current maintenance program and timeline for a typical <br /> Roseville road: <br /> • New pavement <br /> • Seal coat year 2 or 3 <br /> • 2°d application of seal coat year 9— 11 <br /> • 3rd application of seal coat year 16— 10 <br /> • Mill and overlay(2") with condition index 35 —60 <br /> • Full depth m& 0 with condition index under 30 <br /> • Annually crack and joint seal ahead of seal coat projects <br /> • Patching <br /> • Program goal is to maintain an average condition index of 75 <br /> Mr. Culver advised that another factor and new reality to consider was the delam- <br /> ination problem being experienced in the area, with distressed pavements from the <br /> top layer peeling off in strips. Mr. Culver noted that this was being found exclu- <br /> sively on roadways with a seal coat application; and the current theory in the in- <br /> dustry was that moisture was being trapped by the seal coating and eroding the <br /> wear course (top layer of pavement). Since it was a difficult thing to duplicate in <br /> a laboratory setting, Mr. Culver admitted that the definitive cause and a complete <br /> range of pavements affected remain an unknown at this time,but the biggest issue <br /> seen to-date is delamination in early stages followed by a rapid acceleration at <br /> that point. Mr. Culver noted further research was needed to determine if this issue <br /> was exclusive to Minnesota pavement mixes only, and determining how and <br /> where the problem is in the interaction between the pavement mix and seal coat- <br /> ing. <br /> Mr. Culver provided recent photos of this issue in various areas throughout out the <br /> City, as well as a map showing the street segments affected and showing the <br /> City's potential exposure. Based on the City's potential exposure, Mr. Culver re- <br /> viewed the new reality of a future condition index curve as the backlog increases <br />
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