To study the creep characteristics of asphalt concrete after large deformation

triaxial tests are conducted under the conditions of four different temperatures and three different confining pressures

and creep tests are made under the axial stress corresponding to a deviating stress at the axial strain of 20%. The results show that the creep curves are quite different from those of regular creep tests

and the temperature and pressure impose varying effects on creep strain. At initial test stage

the influence of these factors is relatively weak

while with time passing in later stages

creep strain increases with test temperature significantly

but decreases with confining pressure to a certain extent. Under variations in both factors

variation patterns in creep rate and creep acceleration show that very close turning points occur in the sample￠s creeping; The average creep rate at these turning points can be used as a threshold of the turning for the creep stage of asphalt concrete after large deformation. The time to reach the turning point depends on the factors

as shown by our analysis. The higher the temperature or the smaller the pressure

the faster the turning point of creeping will be reached.