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A city in California's Central Valley reduced construction costs twenty-five percent by using advanced materials testing, advanced product technology and advanced design methodology. They then applied advanced field monitoring technology to verify that this section of road had been constructed to a higher load carrying capacity than adjacent sections of road constructed according to dated conventional practice. The city’s project design consultant utilized Resilient Modulus testing and AASHTO 2002 M-E Pavement Design to s elect the EMC SQUARED System for stabilization of subgrade soils and for stabilization of recycled asphalt materials used in base course construction. Quality control services included additional testing. Stabilized materials were sampled from the project site during construction, compacted in laboratory molds and then subjected to Resilient Modulus testing to verify that the stabilized subgrade product produced by the contractor during field construction met design requirements. Once the stabilized layers were constructed and covered with asphalt pavement, Falling Weight Deflectometer (FWD) monitoring verfied that the pavement structural section performed according to design. As would be expected, costs related to engineering services were increased by the use of more up to date laboratory testing, design, quality control and performance monitoring services. These engineering cost increases were dwarfed by the materials cost savings realized by application of the advanced soil stabilization technology. The net savings reduced overall construction costs for the one mile long project by approximately $250,000.00. Like many other areas throughout California and the nation, aggregate materials in the Fresno-Clovis area are mined from quarries and riverbed deposits that are rapidly being exhausted in the nearby area. Round trip hauls are scheduled to lengthen later this season from 20 to 30 miles out to 125 to 175 miles per load of aggregate. The cost advantages of EMC SQUARED System treatment will become even more attractive.
Then factor in the savings in the road wear by eliminating 640 truck trips averaging 150 miles per trip to build just one mile of new roadway. City, county and state taxpayers have subsidized the construction of new roads by providing the paved road network being destroyed by lengthy aggregate hauls, a terrible waste of public resources. As the transportation costs, the air pollution and road wear associated with these long hauls mount up, the built-in demand for proven stabilization treatement becomes apparent. This project was constructed in the San Joaquin Valley, an air basin with extreme air pollution problems. As public agencies, air quality regulators and developers look for areas where improvements in air quality can be achieved without additional cost, the EMC SQUARED System will be at the top of the list.
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The recently implemented AASHTO 2002 M-E Pavement Design methodology was utilized by engineers to provide the most economical road design for the first phase of a large federal penitentiary project, California. With over fifteen acres of paved road and parking lots to construct on top of highly expansive native clay soils, older design methods would have required thick layers of aggregate base rock hauled from over thirty miles away. Design engineers utilized Resilient Modulus testing to carefully evaluate an alternative base layer design constructed of stabilized soil. While lime treatment tested effectively and reduced construction costs, EMC SQUARED® System stabilization was selected as it offered superior performance in testing and additional savings of approximately $250,000.00 for this first construction phase.
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