ABSTRACT

Cold recycled mixtures with bitumen emulsion have an initial resistance problem. To reduce the rutting potential, cement is usually added which prompts significant changes in material properties. This study investigates the rheological properties of emulsion-cement mastics under short and long-term curing with emphasis on fatigue performance. The interaction of cationic and anionic bitumen emulsions with cement was separately investigated. Different ratios of cement to residual bitumen (c/b) between 0 and 0.7 were considered. In short-term curing, specimens were stored at 20°C for 3 days and in long-term curing, specimens were stored at 50°C for 7 days. Frequency sweep and linear amplitude sweep DSR tests were performed at two temperatures and the results were analyzed using the viscoelastic continuum damage theory. Also, frequency sweep test was performed at two high performance temperatures to evaluate the rutting potential of mastics. Furthermore, isothermal calorimetry test was accomplished to investigate the effect of emulsion-cement interaction on hydration progression. Based on the results anionic mastics had better fatigue performance than cationic ones. In contrast, cationic mastics showed a better rutting resistance. The fatigue life decreased at higher strains than 1% with increasing the c/b ratio, while at strains less than 1% the reverse was true.

摘要

带有沥青乳液的冷回收混合物存在初始阻力问题。为了减少车辙的可能性，通常会添加水泥，这会促使材料性能发生显着变化。本研究研究了短期和长期养护下乳液水泥胶粘剂的流变特性，重点是疲劳性能。分别研究了阳离子和阴离子沥青乳液与水泥的相互作用。考虑了介于 0 和 0.7 之间的不同水泥与残余沥青 (c/b) 的比率。在短期养护中，试件在 20°C 下保存 3 天，在长期养护中，试件在 50°C 下保存 7 天。在两个温度下进行频率扫描和线性幅度扫描 DSR 测试，并使用粘弹性连续损伤理论分析结果。还，在两个高性能温度下进行频率扫描测试，以评估胶粘剂的车辙潜力。此外，完成了等温量热测试以研究乳液-水泥相互作用对水​​化进程的影响。结果表明，阴离子胶粘剂比阳离子胶粘剂具有更好的疲劳性能。相比之下，阳离子胶粘剂表现出更好的抗车辙性能。随着 c/b 比的增加，在高于 1% 的应变下疲劳寿命降低，而在应变低于 1% 时，情况正好相反。结果表明，阴离子胶粘剂比阳离子胶粘剂具有更好的疲劳性能。相比之下，阳离子胶粘剂表现出更好的抗车辙性能。随着 c/b 比的增加，在高于 1% 的应变下疲劳寿命降低，而在应变低于 1% 时，情况正好相反。结果表明，阴离子胶粘剂比阳离子胶粘剂具有更好的疲劳性能。相比之下，阳离子胶粘剂表现出更好的抗车辙性能。随着 c/b 比的增加，在高于 1% 的应变下疲劳寿命降低，而在应变低于 1% 时，情况正好相反。