Durability evaluation of asphalt mixtures modified with recycled tire rubber

被引：0

作者：

Goulias, Dimitrios G. ^{[1
]}

Ntekim, Akpanika ^{[1
]}

机构：

[1] Dept. of Civil and Environ. Eng., University of Maryland, 0147A Glenn L. Martin Hall, College Park, MD 20742, United States

来源：

Journal of Solid Waste Technology and Management | 2001年 / 27卷 / 3-4期

关键词：

Adhesion; -; Binders; Durability; Mixtures; Moisture; Recycling; Tires;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The use of natural and synthetic rubber for improving the properties of conventional asphalt materials is being investigated since the 1960s. However, due to the additional complexity in designing and producing asphalt rubber binders and mixtures, the high production cost, and in some cases, conflicting reports regarding their performance, the development and use of these mixtures was limited over the years. Recently, and due to the provisions of the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA) on the use of tire rubber in federally funded projects, several extensive and intensive laboratory and field studies were undertaken. This paper presents the results from the durability evaluation of asphalt rubber mixtures used in paving projects. While the presence of moisture affects the adhesion between the binder and the aggregate producing stripping effects, the characteristics of the asphalt rubber binder is expected to improve mixture durability and performance. The most frequent approach in evaluating the durability of asphalt mixtures considers the changes in the mechanical properties due to moisture exposure. The results are typically provided in terms of equivalent retained strength, durability curves, and/or durability indexes indicating the sensitivity level of the mixtures to moisture. In this laboratory evaluation the moisture damage effects on asphalt rubber mixtures was examined by exposing them at long-term hot immersion conditions, (i.e., 60°C), and average pavement in-service temperature (i.e., 25°C). The durability of the asphalt rubber mixtures was then compared to that of conventional paving mixtures. For such analysis modified and conventional mixtures were evaluated at their optimum binder content. In addition to the retained strength characteristics at different immersion times, stiffness analysis were conducted. The methodology and results of this study can be used for assessing the durability of modified and conventional materials elsewhere.

引用

页码：169 / 171