Laserfiche WebLink
A <br /> WSB <br /> — 701 Xenia Avenue South I Suite 3001 Minneapolis,MN 55416 1 (763)541-4800 <br /> December 27, 2016 <br /> Mr. Bruce Westby P.E. <br /> City Engineer <br /> 7550 Sunwood Drive NW. <br /> Ramsey, MN 55303 <br /> Re: Pavement Evaluations and Recommendations for City of Ramsey Improvement Project 417-01 <br /> 2017 Alpine Drive Reconstruction <br /> Observation: On December 20, 2016 WSB &Associates cored Alpine Drive from Variolate Street to <br /> Armstrong Blvd in the City of Ramsey, MN. This pavement was constructed in the early 1990s and <br /> suffers from severe cracking and tenting during cold weather. A geotechnical report had been completed <br /> earlier and did not clearly define the cause of the cracking and tenting. The goal of the additional coring <br /> was to try to determine why the pavement cracked and tents so severely and to make recommendations <br /> on what to do to reconstruct the pavement. As we cut thru the hot mix asphalt (HMA) at the first core site <br /> we observed a white to cream color slurry coming out of the core hole. Once the core was removed we <br /> observed in the bottom of the core hole what appeared to be concrete material. We were able to core <br /> another 4 inches deeper and remove an intact core out of the base aggregate material. This material <br /> seemed like a lean concrete material. Photos of the cores are provided in Appendix B of this report. <br /> Base on the finding of the first core location we move to an area that the City personnel stated tented the <br /> worst and cut another core. We observed similar results to the first core location. We then cored two <br /> more locations evenly spaced to make sure that similar materials were used the length of the project. All <br /> the cores taken had similar base materials observed under the HMA. <br /> It appears that when the pavement was originally constructed the contractor used crushed recycled <br /> concrete for the Class 5 base materials. Based on observations, it appears that not enough sand was <br /> blended into the recycled concrete to keep it from rehydrating and forming a weak concrete pavement. <br /> This type of material can be prone to swelling when permeated with water causing abnormal cracking and <br /> a very rough driving surface when below freezing. <br /> All of the Hot Mix Asphalt (HMA) cored were approximately 4 inches in thickness. <br /> Recommendations: Based on the information above, our recommendation would be to do full depth <br /> reclamation (FDR) of all the HMA pavement into the Class 5 recycled concrete material to lean out the <br /> existing recycled concrete materials to make it less prone to cracking and swelling. Once the FDR has <br /> been completed then 4 or 5 inches of the newly reclaimed materials would be removed and hauled off to <br /> make room to repave the HMA over newly compacted recycled aggregate base materials. Based on the <br /> traffic levels we would recommend paving it with 4 to 5 inches of SPWEA340C Super Pave. We would <br /> recommend priming the reclaimed materials with penetration emulsion prime to help reduce water <br /> infiltration into HMA. <br /> Please let me know if you have any other questions of comments regarding this report. <br /> Sincerely, <br /> WS5 &As ociates, Inc. <br /> Thomas . Wood <br /> Project Manager <br /> Building a legacy—your legacy. <br /> Equal Opportunity Employer I wsbeng.com <br /> HAdty of ramsey'Apline Drive recommendation 12.27.16 fnal.docx <br />