棉秸秆纤维沥青胶浆路用性能研究.pdfVIP

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。 关键词: 沥青路面，纤维沥青胶浆，棉秸秆纤维，锥入度，粘度，流变性能 i Abstract Asphalt mixtures’ road performance, such as high-temperature stability, low-temperature crack resistance and anti-fatigue properties which are good or bad, determine the service life of asphalt pavement, but the cohesive effect of asphalt mortar performance on the asphalt largely determines the asphalt road performance, especially having a major impact on the mix cracking resistance, fatigue resistance at low temperature. After mixing the fibers, the level of asphalt cement road performance can be greatly improved. Based on the existing research on the performance of asphalt mortar, this paper adds a certain amount of self-made cotton straw fiber to improve the high temperature stability and low temperature cracking of asphalt. We use cotton straw fiber, lignin fiber to prepare different type of fibers and different content of asphalt mortar, The paper evaluates temperature sensitivity of fiber with cone penetration and the performance of shear resistance, analyzing the effect of temperature, fiber ty