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A workshop on full-depth reconstruction of city streets, presented Sept. 12 by the City of San Antonio in conjunction with the 2007 International Public Works Congress and Exposition highlighted various reclamation techniques available to road agencies today.

At the workshop, hundreds of public works personnel from around the United States viewed all phases of a full-depth street reconstruction project, including lime-slurry base soil stabilization, asphalt emulsion-stabilization of the pavement base, stabilized base compaction, and paving with warm mix asphalt.

Previously, the deteriorated pavement and layers below had been removed using a cold milling machine and stockpiled separately. This material later was brought back to site for use for the stabilized base layer.

San Antonio partnered with the Lime Association of Texas in producing the workshop. Chemical Lime Co. provided the lime slurry and delivered it to the site. Ergon Asphalt provided the asphalt emulsion for the reclaimed base as well as the process for the Evotherm warm-mix technology. Vulcan Materials Co. produced the warm-mix asphalt while Valero Asphalt provided the asphalt cement, with The Asphalt Institute providing technical support for both the base and surface layers. Engineering and construction testing services was provided by Fugro Engineering Consultants Inc.

Additional assistance and Wirtgen Group equipment to supplement city-owned Wirtgen Group equipment was provided by Cooper Equipment Co. Inc., San Antonio.