Abstract
THE rheological properties of bitumens and bituminous mixtures are well known and standard procedures for testing them have long been established. Relations between fundamental rheological parameters and quantities measured in routine tests have been reported by several authors. A study of creep and response to dynamic loading has been published by Van der Poel1. In a recent investigation on stress relaxation, Kubat2 found that the normalized inflexion slope of the relaxation curve 1/Δσ(dσ/(d ln t))inflexion (where t is the time, σ is the stress, and Δσ is the stress reduction due to relaxation) was the same for a wide variety of materials, including plastics, rubbers and metals—the last-mentioned also in the form of single crystals. The numerical value was 0.1 ± 0.01. This relationship applied provided the samples were free from internal stress.
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References
Van der Poel, C., J. App. Chem., 4, 221 (1954).
Kubát, J., Nature, 205, 378 (1965).
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ANDERSSON, O. Stress Relaxation of Bitumen and Bituminous Mixtures. Nature 211, 402 (1966). https://doi.org/10.1038/211402a0
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DOI: https://doi.org/10.1038/211402a0
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