Evaluation of Rheological Properties of Asphalt Binder Modifiedwith Biochar from Oat Hulls

被引:1
作者
Martinez-Toledo, Camila [1 ]
Valdes-Vidal, Gonzalo [2 ]
Calabi-Floody, Alejandra [2 ]
Gonzalez, Maria Eugenia [3 ]
Reyes-Ortiz, Oscar [4 ]
机构
[1] Univ La Frontera, Engn Doctoral Program, Temuco 4811230, Chile
[2] Univ La Frontera, Dept Civil Engn, Temuco 4811230, Chile
[3] Univ La Frontera, Dept Chem Engn, Temuco 4811230, Chile
[4] Mil Univ Nueva Granada, Dept Civil Engn, Bogota 111711, Colombia
关键词
biochar; asphalt binder; rheological properties; CARBON-BLACK; PYROLYSIS; GRAPHITE; CEMENT;
D O I
10.3390/ma17174312
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, the effect of biochar from oat hulls (BO) on the rheological properties of a PG 64-22 asphalt binder was evaluated using a full factorial design, which included the following factors: pyrolysis temperature (PT) (300 degrees C and 500 degrees C), BO particle size (<20 <mu>m and <75 <mu>m), and the amount of BO (2.5%, 5%, and 7.5%). First, the morphological and physicochemical properties of BO were analyzed by comparing it with graphite powder (CFG) and commercial activated carbon (CAC). The physicochemical properties of the modified asphalt binder were then evaluated using confocal laser microscopy, scanning electron microscopy (SEM-EDX), and Fourier-transform infrared spectroscopy (FTIR). Its storage stability was also evaluated. Subsequently, the rutting parameter G*/sin(delta) and the Fraass breaking point were analyzed to select asphalt binders that extended their viscoelastic range. The asphalt binders selected were those with 2.5%, 5%, and 7.5% BO, produced at a PT of 300 degrees C with a particle size <20 <mu>m (BO300S). Next, the rheological properties of the selected samples were evaluated by testing for rotational viscosity, rutting parameter G*/sin(delta), multiple stress creep recovery (MSCR), fatigue parameter G*<middle dot>sin(delta), and creep stiffness by bending beam rheometry (BBR). The rheological aging index according to rutting parameter G*/sin(delta) (RAI) was also evaluated. These tests were conducted in different states of the asphalt binder: original, short-term aged, and long-term aged. According to the results, the application of BO300S significantly increased the resistance of the asphalt binder to rutting and rotational viscosity, proportional to the amount added to the asphalt binder. Moreover, low modifier percentages improved fatigue resistance, outperforming CFG and CAC. In addition, it performs well at low service temperatures, registering better resistance than the control asphalt binders.
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页数:29
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