To investigate the impact of temperature on the strength and dilatancy behaviors of hydraulic asphalt con-crete,triaxial shear tests were conducted on asphalt concrete samples at controlled temperatures of-1 ℃,5 ℃,10 ℃,and 15 ℃.The results demonstrate a strong correlation between temperature and the mechanical response of the asphalt concrete.At temperatures below 0 ℃,the samples exhibit evident strain softening and dilatancy behav-iors.However,as temperature rises,the strain softening transforms into strain hardening,and the degree of dilatan-cy decreases.Moreover,the shear strength of asphalt concrete reduces with increasing temperature,with the de-crease in cohesion being more pronounced compared to the internal friction angle.Specifically,as temperature rises from-1 ℃ to 15 ℃,the internal friction angle declines by 4.7°,while cohesion drops from 1.11 MPa to 0.28 MPa.Additionally,the dilatancy angle expands with the increase of axial strain and eventually stabilizes,exhibiting a suitable fit using a hyperbolic function.Remarkably,the parameters of the hyperbola model demonstrate a strong correlation with temperature,making them useful for developing a thermal-mechanic constitutive model for asphalt concrete.
asphalt concretetemperaturestrengthdilatancyrockfill dam
国家科技期刊平台
NSTL
维普
万方数据
