Mechanical and Self-Healing Performances of Asphalt Mixtures Containing Recycled Asphalt Materials and Light-Activated Self-Healing Polymer

被引:9
作者
Shirzad, Sharareh [1 ]
Hassan, Marwa M. [1 ]
Aguirre, Max A. [1 ]
Mohammad, Louay N. [2 ]
Cooper, Samuel, Jr. [3 ]
Negulesco, Ioan I. [4 ]
机构
[1] Louisiana State Univ, Dept Construct Management, Baton Rouge, LA 70803 USA
[2] Louisiana State Univ, Dept Civil & Environm Engn, Baton Rouge, LA 70803 USA
[3] Louisiana Transportat Res Ctr, 4101 Gourrier Ave, Baton Rouge, LA 70803 USA
[4] Louisiana State Univ, Dept Text Apparel Design & Merchandising, Room 125 Human Ecol Bldg, Baton Rouge, LA 70803 USA
关键词
Self-healing; Polymer; Ultraviolet (UV) light; Asphalt binder; Recycled asphalt shingles;
D O I
10.1061/(ASCE)MT.1943-5533.0002903
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The objective of this study is to evaluate the efficiency of a new generation of ultraviolet (UV) light-induced self-healing polymers in enhancing the durability of asphalt mixtures and improving their self-healing capabilities. Mixtures were prepared using two different binders, with and without recycled materials, and self-healing polymers. Results showed that the addition of recycled asphalt materials to mixtures prepared with an unmodified binder (PG 67-22) negatively affected healing recovery at room temperature. The self-healing properties of the mixtures were improved by increasing the healing temperature from 25 degrees C to 50 degrees C, which indicates the temperature dependency of the self-healing properties of asphalt mixtures. The addition of 5% self-healing polymers to the control mixture followed by 48 h of UV light exposure resulted in an increase in the self-healing properties of the mixtures prepared with PG 67-22 binder. Semicircular bending (SCB) test results showed that the incorporation of self-healing polymer and 48 h of UV light exposure improved the cracking resistance of the mixture. Loaded-wheel tracking (LWT) test results showed that the addition of the self-healing polymer caused an increase in the rut depth of the samples prepared with the unmodified binder. However, the final rut depth was less than 6 mm, which is an acceptable rutting performance. Thermal stress restrained specimen test results showed that self-healing polymer improved the low-temperature cracking performance of the mix by increasing the fracture load and decreasing the fracture temperature.
引用
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页数:11
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