Abstract:

Wheel-rutting index(WRI),a new index for evaluating the whole-term high-temperature stability of as.phah mixture is presented by taking into account all the factors affecting the high-temperature perform ance, such as the velocity,the cumulate deform ation and the maximal permanent deformation. and the analysis and comparison of the degrees of track ruts in different periods are then carried out.The results show that the index of DS is not satis-factory because it overlooks the maximum deform ation and the maximal perm anent deformation in the whole Drocess.Thus,it is quite limited in use in the evaluation of the high-temperature perform ance of asphalt mixture. On the contrary ,WRI accords well with the regular patterning of rut formation in practice, and that it shows an effective distinction in the evaluation of the high-temperature stability,without causing the unreasonable occurrence in which the high-temperature perform ances are obviously different while the dynamic stabilities remain similar.

Key words: asphalt mixture, high-temperature performance, wheel-rutting index, cumulate deformation, maximal per-manent deformation