ABSTRACT

The paper investigates the effects of ageing on the linear and nonlinear viscoelastic properties of bituminous binders for paving applications. Four neat binders were analysed in their unaged state and after long-term ageing, which was simulated in the laboratory with the Rolling Thin Film Oven (RTFO) and the Pressure Ageing Vessel (PAV). Amplitude sweep tests and frequency sweep tests were performed to explore the response in the linear domain. Repeated strain sweep tests were carried out to isolate nonlinearity from other mechanisms related to damage. The time–temperature superposition principle and the generalised Maxwell model with a Prony series discretization were used to describe the overall viscoelastic response of binders, introducing strain-dependent shift factors to account for nonlinearity. Results indicate that the adopted experimental and modelling approach allows a proper assessment of the effects of ageing on viscoelasticity.

摘要

本文研究了老化对铺路用沥青粘合剂线性和非线性粘弹性的影响。在实验室中使用滚动薄膜烤箱（RTFO）和压力老化容器（PAV）对四种纯净粘合剂进行了分析，这些粘合剂处于未老化状态和长期老化之后。进行了振幅扫描测试和频率扫描测试，以探索线性域中的响应。进行了重复的应变扫描测试，以将非线性与其他与损伤相关的机制隔离开来。使用时-温叠加原理和具有Prony级数离散化的广义Maxwell模型来描述粘合剂的整体粘弹性响应，引入应变相关的位移因子以解决非线性问题。