ABSTRACT

The influence of the addition of Crumb Rubber (CR) by dry process on the tridimensional linear viscoelastic properties of bituminous mixtures was studied. Advanced complex modulus tests were performed on two bituminous mixtures: a classical one used as reference material and a similar bituminous mixture with 3% of CR (in the mass of the mixture). CR with a continuous 3/6 mm grain size distribution replaced coarse aggregates. Complex modulus and complex Poisson’s ratio were determined from sinusoidal tension/compression loading tests. Experimental data were modelled with the 2S2P1D model. Results show that Time-Temperature Superposition Principle is valid for the mixture containing CR. Similar shift factors were used to obtain master curves of complex modulus and complex Poisson’s ratio of both mixtures. Lower values of norm of complex modulus at high frequencies/low temperatures were found for the mixture with CR. Curves of normalised complex modulus and complex Poisson’s ratio of both mixtures overlap.

摘要

研究了干法添加橡胶粉（CR）对沥青混合料三维线性粘弹性能的影响。对两种沥青混合料进行了高级复模量测试：一种用作参考材料的经典混合料和一种具有 3% CR（以混合物质量计）的类似沥青混合料。具有连续 3/6 毫米粒度分布的 CR 取代了粗骨料。复数模量和复数泊松比由正弦张力/压缩载荷测试确定。实验数据采用 2S2P1D 模型建模。结果表明，时间-温度叠加原理对含CR的混合物有效。使用类似的移位因子来获得两种混合物的复数模量和复数泊松比的主曲线。对于具有 CR 的混合物，发现在高频/低温下复数模量范数较低。两种混合物的归一化复数模量和复数泊松比的曲线重叠。