基于流变学的沥青老化评价指标关系研究

Sduty on Evaluation Indexes for Asphalt Aging Based on Rheology

文章通过不同老化方式来模拟沥青在实际应用中发生的老化,基于流变学理论,对老化前后的沥青进行常规指标和流变指标试验检测,并探索常规指标与流变指标间关系。结果表明:经过PAV长期老化后沥青相位角出现平稳区,表明后期的老化不是单一的氧化老化;在软化点温度条件下,石油沥青与改性沥青分别处于两种不同的流变状态,SBS改性沥青呈现明显的弹性特质;利用Shapiro-Wilk正态检验发现,在a=0.05置信水平下,不管老化状态如何,石油沥青软化点对应的复数模量呈正态分布,表明软化点是一个等模量温度点;可以利用这种等模量温度规律求取普通道路石油沥青的软化点,相对传统软化点检测方法,其样品制作、采集流程要方便,且误差少,但这种方法的应用还需要大量的沥青样本进一步证明和分析。

The paper makes test of the asphalt＇s conventional indicators and the rheological index by using different aging ways to simulate the ageing of asphalt in practice,and explores the relevance of Conventional indicators and the rheological index, based on rheology theory. The result indicates：the asphalt＇s phase angle appears the smooth area by PAV, which indicates the aging in the late is not oxidation aging single;under the soft point temperature,the asphalt and modified asphalt are in different states under their own soft point, and SBS modified asphalt shows a clear elastic quality;using Shapiro-Wilk normality test to find that whatever the aging state, the asphalt soft point corresponding with G＊ presents normal distribution under the level of a=0.05, it shows the soft point is the temperature of equal modulus; so it can use the regular of equal modulus temperature to get the soft point of the asphalt, and the way making samples is so easy and litter error, but the way needs to prove and theoretical analysis by using a lot of the simples of asphalt.