纤维沥青混凝土的松弛性能研究

Relaxation Property of Fiber Reinforced Asphalt Concrete

摘要:

为了分析纤维沥青混凝土的粘弹性能,基于复合材料细观力学和粘弹性力学理论,应用纤维增强复合材料的等效模量公式,结合四单元五参数粘弹性模型对纤维沥青混凝土的松弛模量进行了理论分析,得出纤维沥青混凝土有效松弛模量的粘弹性公式,并利用该公式分析了纤维掺量与纤维沥青混凝土松弛模量之间的关系,探讨了纤维沥青混凝土泊松比的变化对其松弛特性的影响.结果表明,纤维掺量小于0.20%(质量分数)时,计算结果与试验结果能够较好地吻合.在纤维沥青混凝土的松弛过程中,泊松比随着沥青混凝土松弛模量的减小而逐渐增大,不计入泊松比变化的纤维沥青混凝土松弛模量要比计入泊松比变化的松弛模量大.

Abstract:

The main objective of this research is to investigate viscoelastic performance of fiber reinforced asphalt concrete.The effective moduli equation established for fiber reinforced composites and four-unit five-parameter viscoelastic model applied in fiber-reinforced asphalt concrete were used to analyze relaxation modulus of fiber-reinforced asphalt concrete using the theory of composite meso-mechanics and viscoelastic mechanics.The effective relaxation modulus formula of fiber reinforced asphalt concrete was defined for considering viscoelasticity,and furthermore relation between fiber content and relaxation modulus was analyzed and the influence of Poisson's ratio of fiber reinforced asphalt concrete on relaxation property was discussed by means of the formula.The results show that the theoretical results is well consistent with experimental data when the content of fiber is not more than 0.20%(by mass).The Poisson's ratio increases with the decreases of relaxation modulus during the relaxation process of fiber reinforced asphalt concrete and the fiber reinforced asphalt concrete for considering constant Poisson's ratio shows bigger relaxation modulus than the variation of Poisson's ratio.