Abstract
Test data are presented for an asphalt concrete subjected to creep and stress-relaxation in compression at 40°F. Because of the large initial stresses developed in the relaxation tests, perfect step-function inputs of strain as a function of time were not obtained, and it was thus necessary to utilize data exhibiting some variation of strain with time. The relaxation modulus-time relationship was obtained from these results by means of a numerical application of the superposition principle. The mathematical development of the numerical solution from the superposition equation is included. Another numerical procedure was utilized to interconvert test values for creep compliance vs. time to a second relaxation modulus-time relationship. Both solutions were accomplished with the aid of an IBM 7090 computer. Comparison of the results for the relaxation modulus vs. time derived from the two tests showed a comparison sufficiently satisfying to warrant further study along such lines.
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