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Field aging effect on chemistry and rheology of asphalt binders and Theological predictions for field aging

机译：田间老化对沥青胶结剂化学和流变学的影响及田间老化的神学预测

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摘要

This work aims to investigate the field aging effect on binder rheology and structure and to establish the structure-rheological property relationships with the ultimate goal of predicting rheology of field aged binders. Three unmodified binders from different crude oil sources after varying field aging severities were examined in this work. The binders were extracted and recovered from pavement cores at varying depths from two field sites in Arizona and Virginia. The observed Theological hardening is closely correlated and attributed to the compositional changes within asphalts upon field aging, which involves the conversion of aromatics into toluene soluble asphaltenes and an increase in total pericondensed aroma-ticity and carbonyl and sulfoxide functional groups. Although the rheology is significantly impacted by field aging, the temperature dependence of Theological properties maintains unchanged at various aging severities. The Arrhenius temperature dependence is suggested to describe the viscoelasticity of unmodified binders rather than the Super-Arrhenius or Vogel-Fulcher-Tamman or Williams-Landell-Ferry equations due to a small dynamic fragility of 16. Both the Theological and chemical composition results suggest that the bottom slice (～75 mm from pavement surface) of the 8-year old ambient field aged core has similar aging severity to the rolling thin film oven (RTFO) followed by pressure aging vessel (PAV) aging on the control binder. This implies that the field aging on the pavement surface is far more severe than the long term laboratory RTFO PAV aging. Based on the observed structure-rheology relationships and Christensen-Anderson (CA) model, the rheological responses can be successfully predicted for field aged binders at various aging severities or at different pavement depths. The predictions are in good agreement with experimental results.
机译：这项工作旨在研究田间老化对粘结剂流变学和结构的影响，并建立结构-流变特性关系，从而最终预测田间老化的粘结剂的流变学。在这项工作中，研究了来自不同原油来源的三种未改性的粘合剂，这些粘合剂在不同的田间老化强度下都不同。从亚利桑那州和弗吉尼亚州的两个野外地点的不同深度的路面核心中提取并回收粘合剂。观察到的神学硬化密切相关，并归因于田间老化后沥青内的成分变化，这涉及将芳族化合物转化为可溶于甲苯的沥青质，并增加总过缩的芳香度以及羰基和亚砜官能团。尽管流变学受到场老化的显着影响，但是在各种老化强度下，流变特性的温度依赖性仍保持不变。建议使用Arrhenius温度依赖性来描述未改性粘合剂的粘弹性，而不是Super-Arrhenius或Vogel-Fulcher-Tamman或Williams-Landell-Ferry方程，因为它们的动态脆性很小，为16。 8年龄环境现场老化岩心的底部切片（距路面约75 mm）具有与滚动薄膜烘箱（RTFO）相似的老化强度，然后在对照粘合剂上进行压力老化容器（PAV）老化。这意味着路面的现场老化远比长期的实验室RTFO PAV老化严重得多。基于观察到的结构-流变关系和Christensen-Anderson（CA）模型，可以成功预测各种老化强度或不同路面深度的田间老化粘结剂的流变响应。这些预测与实验结果非常吻合。

著录项

  • 来源
    《Fuel》 |2014年第4期|86-94|共9页
  • 作者

    Qian Qin; John F. Schabron; Ryan B. Boysen; Michael J. Farrar;

  • 作者单位

    CAF Materials, 202 Cedar Road, Ennis, TX 75119, United States;

    Western Research Institute, 365 N 9th Street, Laramie, WY 82072, United States;

    Western Research Institute, 365 N 9th Street, Laramie, WY 82072, United States;

    Western Research Institute, 365 N 9th Street, Laramie, WY 82072, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rheology; Structure; Field aging; Asphalt binder; Fragility;

    机译：流变学结构体;田间老化;沥青粘合剂;易碎性;

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