【摘要】 采用动态力学分析（DMA）考察Sasobit对高黏沥青流变性能和常规性能的影响规律。结果表明:Sasobit表现出优越的降黏效果,随着Sasobit掺量的增加,高黏沥青135℃和180℃条件下的黏度显著降低;温度为60℃条件下的黏度和软化点升高,针入度和延度降低;在测定的温度和频率范围内,随着Sasobit掺量的增加,高黏沥青的复数剪切模量G^*、活化能以及温度敏感性增加;在温度为30～60℃内,Sasobit的加入使得高黏沥青的储存模量G′、损失模量G″和车辙因子G^*/sin δ均高于原样沥青,但随着温度的升高,差异性越来越小;随着Sasobit掺量的增加,高黏沥青的零剪切黏度η₀和恢复率R增加,而不可恢复蠕量J_nr减小,高温抗车辙性能得到改善;随着Sasobit掺量的增加,蠕变劲度模量S增加而蠕变曲线的斜率m减小,高黏沥青的低温性能变差。更多还原

【Abstract】 The effect of Sasobit on the rheological and conventional properties of high viscosity asphalt was investigated by dynamic mechanical analysis（DAM）. The results show that Sasobit presents excellent viscosity reduction effect, and the viscosity of high viscosity asphalt decreases significantly at 135 ℃ and 180 ℃ with the increase of Sasobit content. Meanwhile the viscosity at 60 ℃ and softening point increase, and the penetration and ductility decrease. In the measured temperature and frequency range, the complex shear modulus G^*, activation energy E_a and temperature sensitivity of high viscosity asphalt increase with the increase of Sasobit content. In the range of 30-60 ℃, the storage modulus G′, loss modulus G " and rutting factor G^*/sin δ of high viscosity asphalt are higher than those of original asphalt with the addition of Sasobit, but the difference becomes smaller and smaller with the increase of temperature. The zero shear viscosity η₀ and recovery rate R of high viscosity asphalt increase with the increase of Sasobit content, while the irrecoverable creep Jnr decreases, and the high temperature rutting resistance is improved. However, the creep stiffness modulus S increases and the slope m of the creep curve decreases with the increase of Sasobit content, indicating that the low temperature performance of high viscosity asphalt becomes worse.更多还原