Testing Methods for Asphalt-Rubber.

摘要

'Asphalt-rubber'is a mixture of asphalt and fine grindings from rubber tires. The blend is called asphalt-rubber since the amount of rubber used and the characteristics of the blend are quite different than those reported in the asphalt paving literature. Tests performed on a blend of asphalt-rubber were (a) ductility with variable elongation rate and temperature,and (b) absolute viscosity with variable temperature. The major portion of the study was devoted to developing equipment and test procedures for evaluating the use of asphalt-rubber as a strain attenuating layer to minimize reflection cracking in asphaltic concrete. Two test procedures were used to obtain the response of the asphalt-rubber layer when subjected to an increasing axial shearing force and also to a repeated transverse shearing force. The results of the testing program are used to discuss the possible reasons for the successful use of asphalt-rubber as a strain attenuating layer in asphalt overlay or new construction.