玄武岩纤维掺量对沥青胶浆路用性能的影响研究

Effect of Basalt Fiber Content on Road Performance of Asphalt Mortar

为探究不同玄武岩纤维掺量对沥青胶浆路用性能的影响,通过动态剪切流变试验与弯曲梁流变试验,分别得到不同玄武岩纤维掺量与沥青胶浆的车辙因子、蠕变恢复率R、劲度模量、蠕变速率之间的关系。结果表明:在一定范围内,随着玄武岩纤维掺量的增加,沥青胶浆的车辙因子与蠕变恢复率逐渐增大,在60℃~80℃高温下的路用性能得到提升;沥青胶浆的劲度模量随着纤维掺量的不断提升,呈先增后减的趋势,蠕变速率恰恰相反,表明玄武岩纤维通过吸附自身周围的沥青,形成了自身结构更加稳定的混合体系,纤维在胶浆中起到了加筋稳固的效用,增强了低温下沥青胶浆的路用性能,而过量的加入,则容易导致纤维成团,反而破坏了稳定体系,导致沥青胶浆低温性能再次下降。

Focusing on the effect of different basalt fiber content on the road performance of the asphalt mortar, this paper carries out the dynamic shear rheological test and bent beam rheological test to obtain the relationship between different basalt fiber content and rutting factor, creep recovery rate R, stiffness modulus and creep rate of asphalt mortar. The results show that, in a certain range, the rutting factor and creep recovery rate gradually increase with the increase of the basalt fiber content, and the road performance is improved under the high temperature of 60℃ to 80℃. With the increase of the fiber content, the stiffness modulus continuously increases and then decreases, while the creep rate is the opposite, indicating the basalt fiber can form a mixing system with a more stable structure by absorbing the asphalt around itself, which has a reinforcement effect and improve the road performance of the asphalt mortar under the low temperature. The fiber is easy to be lumped with an excessive addition, which destroys the stable system, resulting in the further decline of the low-temperature performance of the asphalt mortar.