**Author details**

2–3, work as a short beam, and it is also deformed under the scheme of bending. In point 3, the number of the occurred cracks increases and for the period of 3–4, separate failure fragments of pavement work under scheme of direct compression. Complete failure of the asphalt concrete pavement occurs at the time moment 4. The road section of the highway "Karagandy-Shakhtinsk," described earlier can serve as an example of the practical realization for the fatigue

If the system in point of bifurcation 1 chooses the thermodynamics branch B, then, first, the transverse cracks occur on pavement, then longitudinal fatigue cracks occur between them, and for the period of time 1–5, separate pavement blocks function as big and short slabs, and they are deformed under scheme of bending. Additional transverse and longitudinal cracks occur in point 5, grids of cracks become more intensive until each of the pavement fragments is not deformed under scheme of direct compression (time period 5–6). Complete failure of the asphalt concrete pavement occurs in time moment 6. The road section of the highway located in Sharjah city (UAE) can serve as an example of the practical realization for the fatigue failure of the asphalt concrete pavement under the thermodynamics branch B.

The results of this study allow drawing the following conclusions for the fatigue failure of the

**1.** In Kazakhstan, the cracks of various types on the asphalt concrete pavements (fatigue, thermal, reflected and sagging) are not identified separately. The staged character of the fatigue failure was not considered. Maximum allowable characteristics, including the fatigue ones, were not determined as well. In the USA, the fatigue cracks are identified separately

failure of the asphalt concrete pavement according to the thermodynamics branch A.

**Figure 14.** Bifurcation scheme at fatigue failure of an asphalt concrete pavement.

**8. Conclusion**

76 Modified Asphalt

asphalt concrete pavement of a highway:

#### Bagdat Teltayev

Address all correspondence to: bagdatbt@yahoo.com

Kazakhstan Highway Research Institute, Almaty, Kazakhstan
