棉秸秆纤维沥青胶浆路用性能研究

发布时间：2018-05-04 06:00

本文选题：沥青路面 + 纤维沥青胶浆　；参考：《长安大学》2015年硕士论文

【摘要】：沥青混合料的高温稳定性、低温抗裂性及抗疲劳特性等路用性能的好坏决定了沥青路面的使用寿命,而对沥青混合料起粘结作用的沥青胶浆的性能很大程度上决定了沥青混合料的路用性能,尤其是对混合料低温抗开裂、抗疲劳性能有重要影响。掺加纤维后,能较大程度地提高沥青胶浆的路用性能。本文在已有沥青胶浆性能研究的基础上,掺加一定量的自制棉秸秆纤维,以此来改善沥青的高温稳定性和低温抗裂性。采用棉秸秆纤维和木质素纤维制备不同纤维类型、不同掺量的沥青胶浆,以锥入度试验评价纤维沥青胶浆温度敏感性和抗剪切性能,分析温度、纤维类型及掺量对沥青胶浆贯入深度、抗剪强度的影响;以动态剪切流变试验评价纤维沥青胶浆的流变特性,分析纤维类型及掺量对复数剪切模量、相位角的影响规律;以布氏粘度试验评价纤维沥青胶浆的粘温特性,分析纤维类型及掺量对粘度的影响;采用弯曲梁流变试验评价纤维沥青胶浆的低温形变性能,分析纤维类型及掺量对低温劲度模量、蠕变速率的影响。结果表明:无论是棉秸秆纤维还是木质素纤维,纤维掺量对沥青胶浆性能影响显著,两者对胶浆性能影响规律相似。随着纤维掺量增加,纤维沥青胶浆高温抗剪性能提高,纤维掺量从1%到3%,对沥青胶浆高温性能改善效果十分显著;随着纤维掺量的增加,纤维沥青胶浆的粘度增大,纤维沥青混合料的拌合温度应稍高于普通沥青混合料;随着纤维掺量增加,纤维沥青胶浆低温劲度模量增大,蠕变速率减小,纤维对沥青胶浆低温性能改善的合适掺量是2%。结合纤维沥青胶浆粘温特性与纤维沥青混合料施工工艺,本文推荐棉秸秆纤维最佳掺量为2%左右,为棉秸秆纤维沥青混合料配合比设计提供参考。
[Abstract]:The high temperature stability, low temperature crack resistance and anti fatigue properties of asphalt mixture determine the service life of asphalt pavement, and the performance of asphalt mixture which is bonded to asphalt mixture determines the road performance of asphalt mixture to a great extent, especially at low temperature resistance to cracking and fatigue resistance of the mixture. In this paper, a certain amount of homemade cotton straw fiber is added to improve the high temperature stability and low temperature cracking resistance of the asphalt on the basis of the research on the performance of the asphalt mortar. With the same amount of asphalt mortar, the temperature sensitivity and shear resistance of the fiber asphalt mortar were evaluated by cone penetration test. The influence of temperature, fiber type and content on the penetration depth and shear strength of the asphalt mortar was analyzed. The rheological properties of the asphalt mortar were evaluated by dynamic shear rheological test, and the type of fiber and the amount of mixed shear modulus were analyzed. The influence of the viscosity of the fiber asphalt mortar was evaluated by the brucellus viscosity test, and the influence of the fiber type and content on the viscosity was analyzed. The deformation properties of the fiber asphalt mortar were evaluated by the bending beam rheological test, and the effects of the fiber type and content on the low temperature stiffness modulus and the creep rate were analyzed. It is cotton straw fiber or lignin fiber, the fiber content has significant influence on the performance of asphalt mortar. With the increase of fiber content, the high temperature shear resistance of the fiber asphalt mortar is increased, the fiber content is from 1% to 3%, and the high temperature performance of the asphalt mortar is remarkably improved; with the increase of fiber content, As the viscosity of fiber asphalt mortar increases, the mixing temperature of fiber bitumen mixture should be slightly higher than that of ordinary asphalt mixture. With the increase of fiber content, the modulus of low temperature stiffness and the creep rate of the fiber asphalt mortar decrease. The appropriate amount of fiber to the improvement of the low temperature performance of the asphalt mortar is the viscosity temperature characteristic of 2%. combined with fiber asphalt mortar and the fiber leachate. In the construction process of green mixture, the optimum content of cotton straw fiber is recommended to be about 2%, which provides reference for the mix proportion design of cotton straw fiber asphalt mixture.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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