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In U.S. Asphalt mixtures have typically been designed with empirical laboratory design procedures. meaning that field experience is required to determine if the laboratory analysis correlates with pavement performance. However, even with proper adherence to these procedures and thedevelopment of mix design criteria, good performance could not be assured. The Superpave is a product of the Strategic Highway Research Program, SHRP. The SHRP was established by U.S. Congress in 1987, $150 million research program to improve the performance, durability of roadand the development of performance based asphalt specifications to directly relate laboratory analysis with field performance. The Superpave is being implemented by Americans agencies to replace the Marshall and Hveem design methods (actually used in Peru). The Superpave system optimises mixture resistance to permanent deformation, fatigu...

Currently in Peru, the design of pavement structures generally considers support capacity values ​​of sandy and silt-clayey subgrades determined fromof laboratory tests CBR- ASTM DI883.The methodology used may not be adequately applied when the C.B.R. value is assumed.of the subgrade related to the dry density equivalent to 95% 6 100% of the Maximum Dry Density - MDS of the Modified Proctor test.The humidity and natural dry density of silt-clay soils have an important influence on the determination of the C.B.R. as has been confirmed in tests on unaltered and compacted samplesComparisons of C.B.R. values ​​were made. obtained from unaltered and compacted samples considering 95% and 100% of the MDS of the Modified Proctor test. Likewise, values ​​of elastic moduli were compared, using an extension of elastic theory.The results indicate that the values ​​of C.B.R. and elast...