For the most coastal areas where the air is very humid,study on the effect of humidity on the performance of asphalt has its practical significance.However,limited research has been done to investigate the effect of h...For the most coastal areas where the air is very humid,study on the effect of humidity on the performance of asphalt has its practical significance.However,limited research has been done to investigate the effect of humidity on rheological properties of asphalt.In this study,asphalt binders were aged in the pressure aging vessel(PAV)under different conditions of moisture and aging time.Then Dynamic Shear Rheometer(DSR)and Bending Beam Rheometer(BBR)measurements were conducted to obtain the parameters relating to the complex modulus,phase angle,failure temperature,and creep stiffness.It was found that the low temperature performance decreased as evidenced by the results of the creep stiffness.While there were no significant differences among conditioned binders based on complex modulus G*and phase angleδ,it was found that theδvalue increased when the humidity increased from 0% to 80% ,and then theδvalue decreased when the humidity increased to 100% .In addition,the results of the failure temperature indicated that the humidity of 80% would be a critical point for the high temperature performance of the asphalt binders.展开更多
针对目前延度测试中沥青结合料老化程度考虑不足,通过试验提出了不同老化程度的重交基质沥青延度测试条件:温度为15℃、拉伸速率为5 cm/m in。通过测试不同老化程度沥青的延度,得出沥青从原样到TFOT、再到10 h PAV老化,延度衰变很快;到2...针对目前延度测试中沥青结合料老化程度考虑不足,通过试验提出了不同老化程度的重交基质沥青延度测试条件:温度为15℃、拉伸速率为5 cm/m in。通过测试不同老化程度沥青的延度,得出沥青从原样到TFOT、再到10 h PAV老化,延度衰变很快;到20 h PAV老化后,延度变化减小。试验证明,不同老化程度沥青的15℃延度和相应的低温BBR指标S、m具有较高的相关性。为了更好体现服务期内沥青路面的低温抗裂性能,除进行原样沥青和TFOT(RTFOT)后沥青的延度测试外,建议增加一定时间的PAV试验再进行延度测试。展开更多
基金supported by the National Natural Science Fund Project of China(NSFC)(No.:51278173)the Natural Science Fund Project of Jiangsu Provincial Communications Department(No.:SBK201120606)
文摘For the most coastal areas where the air is very humid,study on the effect of humidity on the performance of asphalt has its practical significance.However,limited research has been done to investigate the effect of humidity on rheological properties of asphalt.In this study,asphalt binders were aged in the pressure aging vessel(PAV)under different conditions of moisture and aging time.Then Dynamic Shear Rheometer(DSR)and Bending Beam Rheometer(BBR)measurements were conducted to obtain the parameters relating to the complex modulus,phase angle,failure temperature,and creep stiffness.It was found that the low temperature performance decreased as evidenced by the results of the creep stiffness.While there were no significant differences among conditioned binders based on complex modulus G*and phase angleδ,it was found that theδvalue increased when the humidity increased from 0% to 80% ,and then theδvalue decreased when the humidity increased to 100% .In addition,the results of the failure temperature indicated that the humidity of 80% would be a critical point for the high temperature performance of the asphalt binders.
文摘针对目前延度测试中沥青结合料老化程度考虑不足,通过试验提出了不同老化程度的重交基质沥青延度测试条件:温度为15℃、拉伸速率为5 cm/m in。通过测试不同老化程度沥青的延度,得出沥青从原样到TFOT、再到10 h PAV老化,延度衰变很快;到20 h PAV老化后,延度变化减小。试验证明,不同老化程度沥青的15℃延度和相应的低温BBR指标S、m具有较高的相关性。为了更好体现服务期内沥青路面的低温抗裂性能,除进行原样沥青和TFOT(RTFOT)后沥青的延度测试外,建议增加一定时间的PAV试验再进行延度测试。
