Abstract
The main objective of this study is to evaluate the effect of nanosilica (NS) concentration on the rutting parameter of based asphalt binder using the multiple stress creep and recovery (MSCR) test. NS with concentrations between 1% to 5% (1% increment) was used to modify asphalt binder. The nanosilica modified asphalt binder (NSMB) were aged using rolling thin film oven (RTFO) before tested. MSCR test was conducted at 64°C with two stress level (100 Pa and 3200 Pa). The results found that the addition of NS reduced the accumulative strain of NSMB. Besides that, non-recoverable creep compliance decreased and recovery strain increased, which indicates an improvement of rutting resistance and elasticity of the binder, respectively. The grade of asphalt binder also improved from heavy (H) grade to extreme (E) grade. Overall, NSMB 2% show the best improvement in terms of Jnr and %R, thus NSMB 2% considered as a optimum percentage.
Highlights
Permanent deformation or rutting is one of the main problems in asphalt pavement; it is caused by repeated loading from heavy traffic loading which results in progressive accumulation of permanent deformation under repetitive tire pressures [1]
This multiple stress creep and recovery (MSCR) test result is a reflection of the visco-elastic-plastic property of asphalt binder; when the load is removed, the elastic strain recovered quickly, while the viscous strain recovered slowly [8]
In terms of the effect of NS on the MSCR results, it seems that the accumulated strain is significantly reduced compared to base asphalt binder
Summary
Permanent deformation or rutting is one of the main problems in asphalt pavement; it is caused by repeated loading from heavy traffic loading which results in progressive accumulation of permanent deformation under repetitive tire pressures [1]. Rutting significantly affect the pavement performance and reduce its service life. The resistance of asphalt pavement to rutting depends on many factors. One of the main importance factor is the stiffness of the asphalt binder. It is necessary to modify asphalt binder in order to improve it stiffness. The use of nanotechnology in asphalt binder modification promises better result in improving asphalt binder stiffness. Various nanomaterials have been used to modify asphalt binder such as nanosilica (NS)
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