<p><p><figure id='attachment_3536' style='max-width:737px' class='caption aligncenter'><img class="wp-image-3536 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Graph showing the particle size distribution of recycled pavement material used in the Waseca Minnesota road reconstruction." width="737" height="582" /><figcaption class='caption-text'> Particle distribution of the recycled pavement material (RPM). (Li et al., 2007; With permission from ASCE)</figcaption></figure></p><p><h2>Project Summary/Scope:</h2>Asphaltic Recycled Pavement Material (RPM) blended with Class C fly ash was used as base course during reconstruction of a 0.5-km section of asphalt pavement. The subsurface conditions consisted of unstabilized base course.</p><p>Broadly graded granular RPM was created by pulverizing and blending the existing hot-mix asphalt, base, and some of the subgrade to a depth of approximately 300 mm.</p><p>However, the California Bearing Ratio (CBR) and resilient modulus (MR) of Stabilized Recycled Pavement Materials (SRPM) mixed in the field were lower than those for SRPM mixed in the laboratory (66% lower for CBR, 25% lower for MR).</p><p>Similar biases between mixtures prepared in the laboratory and field have been observed by others and need to be considered when pavement design is based on data obtained by testing mixtures blended in the laboratory.<br><h2>Alternate Technologies:</h2>Conventional materials.<br><h2>Performance Monitoring:</h2>California Bearing Ratio (CBR) and resilient modulus (MR) tests were conducted on the RPM alone and fly ash-stabilized RPM mixed in the field and laboratory to evaluate how the addition of fly ash improved the strength and stiffness.</p><p>In-situ testing was also conducted on the pavement with a falling weight deflectometer to evaluate whether winter affected the stiffness of the SRPM.</p><p>Monitoring of the pavement will be conducted in the future to determine if the<br>resistance to damage by freeze-thaw cycling persists.<br><h2>Cost Information:</h2>Construction costs are lower relative to new construction.<br><h2>Case History Author/Submitter:</h2>Minnesota Local Road Research Board (LRRB)<br><h2>Project Technical Paper:</h2>Li, L., Benson C.H., Edil T.B., Hatipoglu, B., and Tastan, O., (2007). Evaluation of recycled asphalt pavement material stabilized with fly ash, Geo-Denver 2007: New Peaks in Geotechnics, ASCE, GSP169.<br><a href="http://ascelibrary.org/doi/abs/10.1061/40913%28232%299">http://ascelibr… Case History Prepared:</h2>November 2012</p></p>