Preparation and properties of high viscosity and elasticity asphalt by styrene–butadiene–styrene/polyurethane prepolymer composite modification

Abstract

The porous asphalt pavements is often used in important occasion for its special properties and performance which can be to a great extent attributed to the binder—high viscosity and elasticity asphalt (HVEA). To prepare high demanding binder for porous asphalt pavements, the polyurethane prepolymer (PUP) and styrene–butadiene–styrene (SBS) were used to modify the matrix asphalt compositely. First, based on a series of physical tests, the effects of binder composition on performance of SBS/PUP HVEA binder (SBS/PUP‐HVEA) were investigated. Then the Fourier transform infrared (FTIR) test was conducted to investigate the reaction mechanism of SBS/PUP‐HVEA binder. Last, the fluorescence microscopy, stability tests, multiple stress creep recovery test, and differential scanning calorimetry test were carried out to evaluate and compare the phase structure, storage, high‐temperature performance, thermostability characteristics of several HVEA binders. It is found that the composite modification of SBS and PUP can produce high quality binder which possesses high viscosity and high elasticity. And the composition of SBS/PUP‐HVEA were recommended as follows: Shell‐70# can be chosen as matrix asphalt, the contents of SBS modifier (SBS1301:SBS4303 = 1:2), H2122A PUP, chain extender M‐OEA, and crosslinker sulfur were suggested 4%, 5%, 0.5%, and 1‰, respectively. The new functional groups observed in FTIR confirmed the existence of physical and chemical reactions in the modification process, which were beneficial to improve the high temperature performance and storage stability of the binder. SBS/PUP‐HVEA had good phase structure, storage stability, high temperature performance, and thermostability compared to other HVEA binders. This study demonstrated that the SBS/PUP compositely modified asphalt possessed high viscosity and high elasticity, which can be used in the porous asphalt mixture and other highly demanding working environment as well.

Preparation of hyperbranch‐structured polyester fiber via thiol‐ene click reaction under UV light irradiation for asphalt binder modification

“…The block polymer, especially styrene-butadiene-styrene is commonly used as the modifier for asphalt binder attributed to its abundant availability, cost-effectiveness, and acceptable performance. 1 However, issues like rutting, oil flooding, severity of environmental agents, and economic growth leading to a concurrent increase in traffic loads has greatly hindered these applications of asphalt. 2 Hence, improving the mechanical properties of styrene-butadiene-styrene modified asphalt (SBSMA) with network structure 3 under high temperature by adding additives has been widely studied.…”

“…The block polymer, especially styrene‐butadiene‐styrene is commonly used as the modifier for asphalt binder attributed to its abundant availability, cost‐effectiveness, and acceptable performance 1 . However, issues like rutting, oil flooding, severity of environmental agents, and economic growth leading to a concurrent increase in traffic loads has greatly hindered these applications of asphalt 2 .…”

The Modification Mechanism, Evaluation Method, and Construction Technology of Direct-to-Plant SBS Modifiers in Asphalt Mixture: A Review

“…Adding filler oil can effectively increase the high-temperature flowability of direct injection modifiers and improve the melt index. When mixed with high-temperature stones in the mixing plant, it promotes the rapid melting of the modifier [43][44][45][46].…”

Study on Adhesion Property and Moisture Effect between SBS Modified Asphalt Binder and Aggregate Using Molecular Dynamics Simulation

“…Styrene–butadiene–styrene (SBS), as a favorable modifier, has been verified and widely utilized in the construction of asphalt pavement to improve the performance properties of bituminous materials over a wide range of servicing temperatures [ 10 ]. Some studies validated that the addition of proper content SBS modifiers with asphalt binder could remarkably increase the viscosity of the asphalt binder and further improve the adhesion property [ 11 ]. However, most investigations focused on engineering performance using experimental methods, while the improvement mechanism is difficult to be revealed [ 12 , 13 ].…”