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Standardization requirements for the Swiss annex to EN for complex modulus and resistance to fatigue

The European standards [EN 12697-24: 2004+A1; EN 12697-26] specify methods for characterizing the stiffness and fatigue behavior of bituminous mixtures by alternative tests, including bending tests. The tests are performed on compacted bituminous materials under sinusoidal loading. The procedures are used to rank bituminous mixtures on the basis of stiffness, as a guide to relative performance in the pavement, to obtain data for estimating the structural behavior in the road and to judge test data according to specifications for bituminous mixtures. Using performance oriented requirements the expected life of pavements can be improved. Currently the Swiss annex to the EN standards [SN 640 431-1b-NA; SN 640 431-20b-NA], define requirements for stiffness and complex modulus for AC EME C1 and C2. It is necessary to develop similar requirements for a wide palate of pavements used currently in Switzerland. To this end, laboratory compacted samples or field compacted fresh samples will be used to develop type testing requirements. This proposal is a follow up project to VSS 2006/503. It is intended to use standardized compaction and specimen production techniques and to validate the results in comparative tests with another European laboratory, since these aspects are expected to have significant influence on the scatter and reliability of the results.