Rheological and Aging Properties of Composite Modified Bitumen by Styrene–Butadiene–Styrene and Desulfurized Crumb Rubber

Abstract

Taking advantage of crumb rubber from waste tires to modify bitumen is widely for the environmentally friendly and sustainable development of pavement. This study investigated the modification mechanism, rheological, and aging properties of styrene–butadiene–styrene (SBS)/desulfurized crumb rubber (DCR) composite modified bitumen (SBS/DCRMB). Morphological features and chemical characteristics were assessed by fluorescence intensity measurement and gel permeation chromatography (GPC), respectively, and results demonstrated that the DCR and SBS modifier in SBS/DCRMB had been vulcanized and formed a three-dimensional network structure. Moreover, a comparison of the GPC elution curve showed the residual bitumen hardly changed due to carbon black released from DCR of SBS/DCRMB during the aging process of SBS/DCRMB, and the polymer molecules condensed to larger units. However, the remaining bitumen in SBSMB had changed evidently and the polymer degraded to smaller molecules. Meanwhile the rheological testing results, including multiple stress creep recovery, linear amplitude sweep and bending beam rheometer, declared that the SBS/DCRMB is superior to SBSMB before and after aging.

Study on the Aging Mechanism and Microstructure Analysis of Rice-Husk-Ash- and Crumb-Rubber-Powder-Modified Asphalt

“…From the 1930s, the utilize of rubbers from waste rubbers as an additive in the asphalt mixture [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Because of the ability of crumb rubber powder (P) to enhance the asphalt binder and mixture performance [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], therefore, using of crumb rubbers recently increased widely in construction pavement as a probable solution in minimizing waste tires and the disposal areas. Many researchers used composite-modified asphalt containing P and different modifiers, and they examined the characteristics of the composite-modified asphalt through number of micro-analysis methods and property tests [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

A Temperature-Independent Methodology for Polymer Bitumen Modification Evaluation Based on DSR Measurement

“…It requires a comprehensive demonstration to determine whether a particular substance is feasible for bitumen modification. By far, many studies have confirmed the success of various kinds of modifiers in the bitumen [ 3 , 4 , 5 , 6 ]. Currently reported modifiers with promising applications are polymers, chemical modifiers, recycled solid waste, and other additives (for instance, adhesion improvers and anti-oxidants) [ 7 ].…”

Polymeric Composites in Road and Bridge Engineering: Characterization, Production and Application

“…Zhang et al adopted the mechanochemical method to prepare desulfurized crumb rubber-modified asphalt and analyzed the effects of desulfurization process variables [ 3 ]. Furthermore, Xu et al investigated the modification mechanism, rheological, and aging properties of SBS/desulfurized crumb rubber composite-modified bitumen [ 4 ]. Zhao et al explored the influence of composite modification of activated crumb rubber powder and SBS on asphalt [ 5 ].…”