The Properties of Micro Carbon Fiber Composite Modified High-Viscosity Asphalts and Mixtures

Abstract

In order to produce a high-viscosity asphalt and mixtures that can be used for ultra-thin overlays, high contents of Styrene–butadiene–styrene (SBS, 5%, 6%, 7%), styrene butadiene rubber (SBR, 1%, 2%, 3%) and micro carbon fiber (MCF, 0.8%) were used to modify conventional asphalt to prepare high-viscosity modified asphalt suitable for this purpose. The performance of the modified asphalts was evaluated by conventional index, kinematic viscosity, dynamic shear rheological test (DSR), multiple stress creep recovery test (MSCR), and bending beam rheometer test (BBR). The road performance of the modified asphalt mixtures was evaluated by high-temperature rutting, low-temperature bending, freeze-thaw splitting, fatigue, speckle, anti-skid, and water seepage tests. The results show that increasing the content of SBS can improve the high-temperature deformation resistance, low-temperature failure strain, kinematic viscosity, and viscosity toughness of modified asphalt, and the optimum content of SBS was 6%. SBR can improve the high-temperature performance, kinematic viscosity, and water damage resistance of modified asphalt, and the optimum dosage was 2%. Compared with 5% SBS-modified asphalt mixture, the dynamic stability, low-temperature failure strain, and freeze-thaw splitting strength ratio of 6% SBS + 0.8% MCF composite-modified asphalt mixture were increased by 48.7%, 24.7%, and 5.2% respectively. Compared with the 5% SBS-modified asphalt, the same characteristics of the 2% SBR + 5% SBS + 0.8% MCF composite-modified asphalt increased by 127.1%, 13.5%, and 5.5%, respectively. Compared with 5% SBS-modified asphalt, the fatigue performance of 6% SBS + 0.8% MCF-modified asphalt was improved by 32.2%. The kinematic viscosity of 6% SBS + 0.8% MCF and 5% SBS + 0.8% MCF + 2% SBR modified asphalt met the performance requirements of high-viscosity asphalt and had excellent road performance. It can be applied to ultra-thin overlays to optimize its adhesion with the original pavement.

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

“…As the main form of road surface in China, asphalt pavement has distinct advantages, such as a good driving comfort, excellent road performance, strong environmental adaptability, and significant economic benefits [ 1 , 2 ]. As a binder for asphalt pavement, asphalt has an excellent bonding performance.…”

Investigation on the Short-Term Aging Scheme for High Viscosity Modified Bitumen

“…As such, the bitumen involved in the production of OGFC mixtures needs to be extremely cohesive, with the aggregate to guarantee the performance of the bituminous mixture. Currently, high viscosity modified bitumen (HVMB) is one of the best choices to produce OGFC mixtures [9][10][11], which is a type of modified bitumen that satisfies the basic requirements of normal modified bitumen, as well as satisfies some other requirements such as a dynamic viscosity of over 20,000 Pa.s, a viscous toughness of over 20 N.m, and a toughness of over 15 N.m.…”

Study on Performance and Mechanism of SBR and Bio-Oil Recycled SBS Modified Asphalt

“…SBR-modified asphalt has better ductility and stress relaxation ability [ 22 ]. Due to the solubilization reaction between SBR and asphalt, the viscosity will increase when the SBR doping exceeds 2% [ 23 ]. Meanwhile, the SBR absorbed the oil in asphalt, which improved the colloidal structure of asphalt.…”