A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Recent findings from research projects under the auspices of the National Cooperative Highway Research Program (NCHRP) clearly emphasize the importance of dynamic modulus testing of asphalt mixes. This single material property, the dynamic modulus of asphalt concrete, will be used as the key parameter in the 2002 AASHTO Design Guide as well as in the Superpave simple performance test protocol that complements the volumetric mix design. The release of the new AASHTO pavement design guide in 2002 makes it urgent to obtain dynamic moduli values of typical asphalt mixes used in North Carolina. The objective of this study is to develop a database of dynamic moduli values and their variability for asphalt mixes used in North Carolina using both the uniaxial compression test and the indirect tensile test. In addition to the dynamic modulus testing of the representative mixes, surrogate methods will be evaluated, including the impact resonance method and Witczak's predictive equation. These methods may be acceptable for the design of mixes and pavements that are normally subject to low traffic volume. The dynamic modulus database to be developed from this project will allow the NCDOT Pavement Management Unit (PMU) to evaluate the new AASHTO pavement design guide in the short term and will provide necessary input for the design of asphalt pavements using the new design guide in the long term. Also, this database will provide necessary information to use the dynamic moduli values in forensic studies and overlay design. The experience and database obtained from this research will also help the NCDOT Materials and Tests Unit (M&T) implement the dynamic modulus testing in its own laboratory.
Recent findings from research projects under the auspices of the National Cooperative Highway Research Program (NCHRP) clearly emphasize the importance of dynamic modulus testing of asphalt mixes. This single material property, the dynamic modulus of asphalt concrete, will be used as the key parameter in the 2002 AASHTO Design Guide as well as in the Superpave simple performance test protocol that complements the volumetric mix design. The release of the new AASHTO pavement design guide in 2002 makes it urgent to obtain dynamic moduli values of typical asphalt mixes used in North Carolina. The objective of this study is to develop a database of dynamic moduli values and their variability for asphalt mixes used in North Carolina using both the uniaxial compression test and the indirect tensile test. In addition to the dynamic modulus testing of the representative mixes, surrogate methods will be evaluated, including the impact resonance method and Witczak's predictive equation. These methods may be acceptable for the design of mixes and pavements that are normally subject to low traffic volume. The dynamic modulus database to be developed from this project will allow the NCDOT Pavement Management Unit (PMU) to evaluate the new AASHTO pavement design guide in the short term and will provide necessary input for the design of asphalt pavements using the new design guide in the long term. Also, this database will provide necessary information to use the dynamic moduli values in forensic studies and overlay design. The experience and database obtained from this research will also help the NCDOT Materials and Tests Unit (M&T) implement the dynamic modulus testing in its own laboratory.
Typical Dynamic Moduli for North Carolina Asphalt Concrete Mixtures
2005
264 pages
Report
No indication
English
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