Abstract
A new treatment method of combined crumb rubber and steel slag modifier for asphalt binders was proposed in this work. The viscosity, rheological properties, and thermogravimetric analysis of modified asphalt mortar were then investigated. The modified asphalt composite was prepared in laboratory by two steps. Rubber powder was firstly added into hot asphalt flux to make rubber modified asphalt (RA), and then RA binders were wrapped with steel slag powder by granulation machine to make compound rubber and steel slag filler modified asphalt composite (RSAC). Test results showed that the viscosity–temperature susceptibility of RSAC was superior to that of modified asphalt binder with only one additive. The softening point differences of RSAC was 2.1 °C. The complex modulus and phase angle were significantly influenced by the addition of steel slag fillers. Creep tests show that a better anti-permanent deformation performance of RSAC can be obtained, which means a better low temperature performance could be predictable. The CAM (Christensen-Anderson-Marasteanu) and Burgers models can be used to describe the change of complex modulus and viscous-elasticity performance of RSCA. The lower value of me (0.6344) and R (0.1862) from the CAM model indicated that RSAC was slightly related to the sensibility of frequency. The higher value of λ∞ and E0 of RSAC indicated a better ability of shear-creep resistance.
Highlights
Road construction is a major part of infrastructure
Facilitate to the transportation and storage of rubber modified asphalt, the storage stability test was RSAC was prepared in order to facilitate to the transportation and storage of rubber modified asphalt, necessary according to the test procedure in previous literature [25]
The flowability of the asphalt binder can be evaluated by viscosity test which usually provides information for mixing and compaction temperatures of asphalt mixtures
Summary
Road construction is a major part of infrastructure. During road construction, asphalt pavements are widely used on highways due to advantages such as the driving safety and comfort offered by asphalt mixtures [1]. Lots of scientific research has focused on the modifier of asphalt binders and mineral filler of asphalt mortar for improving the properties of asphalt mixture. Many efforts have been devoted to treating the modifiers or fillers before their utilization in the modification of asphalt binders in order to improve storage stability [14,24] Few of these efforts have reported on either continuously modifying asphalt binders by adding crumb rubber and steel slag fillers, or preparing the compound rubber and steel slag filler modified asphalt composite (RSAC) for the purpose of better storage stability and convenient transportation of modified asphalt composite. The object of this work is to prepare the compound rubber and steel slag filler modified asphalt composite, as well as to conduct a comprehensive investigation on the rheological properties of RSAC. The conventional properties, such as viscoelastic behavior, rheological behavior, storage stability, as well as thermogravimetric analysis were studied
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