Abstract
AH‐30 is a type of high‐viscosity matrix asphalt. The asphalt mixture made by AH‐30 as a binder has an excellent antirutting performance. However, the other road performance of AH‐30 was still worthy of attention. This research aims to reveal the properties of AH‐30 and its impact on the road performance of asphalt mixtures (AH30‐AC20/25). The AH‐70 neat asphalt and SBS modified asphalt were prepared for comparison. The high‐temperature sensitivity and fatigue resistance of AH‐30 are evaluated by the dynamic shear rheological (DSR) test. The low‐temperature performance is evaluated by the bending beam rheometer (BBR) test. The high‐temperature stability (HTS) of AH30‐AC20/25 is carried out by the wheel tracking (WT) test and the repeated shear constant height (RSCH) test. The low‐temperature crack resistance (LTCR) is carried out by the direct stretching (DS) test. The fatigue property is carried out by the three‐point bending test. Water stability (WS) is carried out by the Marshall residual stability (MRS) and the intensity ratio of the frozen and melted (IRFM) test. The test results show that the high‐temperature resistance of AH‐30 is better than that of AH‐70. The low‐temperature crack resistance of AH‐30 is equivalent to that of AH‐70. The AH‐30 as a binder can meet the requirements of the roads, which are located at a minimum temperature of not less than −10.5°C in winter. The fatigue property of the AH‐30 asphalt mixture is poor, which may be one reason why AH‐30 asphalt pavement is more prone to cracking. The water stability of the AH30‐AC (20/25) asphalt mixture can meet the specification requirements, and AH30‐AC20 is better than the other two asphalt mixtures. The research of this paper will provide a basis and reference for the popularization and application of AH‐30 in asphalt pavement.
Highlights
With the rapid growth of traffic, rutting in an asphalt pavement has gradually become one of the main problems that plague civil engineers in various countries [1,2,3]
AH-70 and SBS-modified asphalt are the comparison items. e AH-30 and AH-70 are all of grade A and produced by China Overseas Asphalt (Taizhou) Co., Ltd in Shang Dong, China. e 1301 linear SBS modifier provided by the Yueyang Petrochemical Complex Co., Ltd. was selected to modify the bitumen. e main specifications are shown in Table 1. e type of SBS-modified asphalt is I-D
Two indexes could be obtained from the test result to evaluate the high-temperature sensitivity of asphalt: phase angle δ and antirutting factor G∗/sin δ. e fatigue resistance of asphalt is evaluated by G′′ G∗ × sin δ. e antifatigue performance test selects the asphalt aged by PAV, and the test temperature is 19°C, 22°C, and 25°C, respectively
Summary
With the rapid growth of traffic, rutting in an asphalt pavement has gradually become one of the main problems that plague civil engineers in various countries [1,2,3]. In the summer, the asphalt mixture is heated and softened, and the asphalt pavement resistance to deformation is reduced under high temperatures. Under the action of the longitudinal shear stress of the vehicle tires, the pavement will undergo irreversible deformation, which is the main reason for rutting [4,5,6]. E water on the asphalt pavement cannot be removed quickly on rainy days with rutting. Many scholars have done much work to improve the rutting problem of the asphalt pavement under heavy traffic conditions [9,10,11]. As an essential part of the asphalt mixture, asphalt plays a decisive role in rutting formation [12]
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