scholarly journals Evaluation of the Aging of Styrene-Butadiene-Styrene Modified Asphalt Binder with Different Polymer Additives

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5715
Author(s):  
Bangwei Wu ◽  
Chufan Luo ◽  
Zhaohui Pei ◽  
Chuangchuang Chen ◽  
Ji Xia ◽  
...  
Keyword(s):  
Complex Modulus ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Polymer Additives ◽  
Modified Asphalt ◽  
Aging Resistance ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Aging Indicator ◽  
Butadiene Styrene

A wide variety of polymer additives have been widely used in recent years. However, the effect of different polymer additives on the durability of asphalt binders has not been investigated thoroughly. To evaluate the aging property of styrene-butadiene-styrene (SBS) asphalt binder with different polymer additives, three polymer modifiers, namely high modulus modifier (HMM), anti-rutting agent (ARA), and high viscosity modifier (HVM), were added to it. First, the Thin Film Over Test (TFOT) and Pressure Aging Vessel (PAV) was performed on the asphalt binders. The rheological properties of the four asphalt binders before and after aging were then checked by the Dynamic Shear Rheometer Test (DSR). The chemical compositions of the asphalt binders were determined by the Fourier Transform Infrared Spectrometer (FTIR) test. Several aging indicators were adopted to reflect the aging degree of the asphalt binders. The results show that when polymer additives are added to the SBS asphalt binder, the complex modulus, storage modulus, loss modulus, and rutting factor substantially increase and the phase angle decreases. All the test parameters become higher after aging. The phase angle of the SBS asphalt binder is the highest at both unaged and aged states, while its other parameters values are the smallest. Moreover, the Carbonyl Aging Indicator (CAI) of SBS with polymer additives becomes lower under both TFOT and PAV conditions, indicating that polymer additives can improve the aging resistance of SBS asphalt, of which HVM modifies the aging resistance best. Complex Modulus Aging Indicator (CMAI) and Storage Modulus Aging Indicator (SMAI) have the best correlation coefficients with CAI, and the two aging indicators can be used to predict the aging degree of polymer modified asphalt binders.

scholarly journals Study on Styrene-Butadiene-Styrene Modified Asphalt Binders Relaxation at Low Temperature

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2888
Author(s):  
Sylwia Dziadosz ◽  
Mieczysław Słowik ◽  
Filip Niwczyk ◽  
Marcin Bilski
Keyword(s):  
Low Temperature ◽  
Force Measurement ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Short Term ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

The paper presents the results of laboratory investigation on asphalt binders relaxation at low temperature, carried out in a ductilometer using the tensile test with continuous force measurement. Polymer modified asphalt binder samples consisting of a 50/70 penetration grade bitumen mixed with a concentrate of styrene-butadiene-styrene (SBS) modified bitumen—a 160/220 penetration grade bitumen modified with a SBS copolymer in the amount of 9%—were tested. Therefore, polymer modified binders containing 3%, 4.5%, 6% and 7.5% SBS, respectively, were obtained and investigated. Tensile tests were performed at −16 °C on samples before aging and subjected to short-term aging (RTFOT). Test results in the form of relaxation curves have been mathematically described using a modified generalized Maxwell model. Based on the acquired results, it was shown that the increase of the SBS copolymer content in asphalt binder precipitates the relaxation process, while aging slows down this phenomenon. It has also been proven that with increased content of SBS elastomer in asphalt binder, the effect of short-term aging on binder’s stress relaxation ability at low temperatures is reduced.

Compatibility and Storage Stability of Asphalt Binder Modified by Styrene-Butadiene-Styrene (SBS) Graft Copolymer

2021 ◽  
Vol 1036 ◽  
pp. 459-470
Author(s):  
Hong Gang Zhang ◽  
Qiang Huai Zhang ◽  
Xue Ting Wang ◽  
Hua Tan ◽  
Li Ning Gao ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Storage Stability ◽  
Asphalt Binder ◽  
Solubility Parameters ◽  
Suitable Alternative ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt ◽  
Butadiene Styrene

A styrene-butadiene-styrene triblock copolymer (SBS) was grafted with an unsaturated polar monomer (monomer A) composed of maleic anhydride (MAH) and methoxy polyethylene (MPEG) via a ring-opening reaction after epoxidizing styrene-butadiene-styrene triblock copolymer (ESBS). The microscopic changes of SBS before and after grafting has been characterized with Fourier transform infrared spectrum (FT-IR), X-ray photoelectron spectroscopy (XPS) and gel permeation chromatography (GPC). The results revealed that the monomer A was successfully grafted on SBS backbone, and the maximum graft ratio (GR) was 20.32%. To verify the compatibility between SBS and asphalt, solubility parameters and surface free energy (SFE) of SBS, grafted SBS and asphalt were measured. It was found that the solubility parameter and SFE of grafted SBS were closer to asphalt compared with SBS. It also has been confirmed from storage stability that the temperature susceptibility of grafted SBS modified asphalt was reduced in compare with SBS modified asphalt binder. As consequence, the use of grafted copolymer can be considered a suitable alternative for modification of asphalt binder in pavement.

The effects of base binder and styrene–butadiene–styrene structure on rutting resistance of polymer–nanocomposite asphalt mixture

2017 ◽  
Vol 50 (3) ◽  
pp. 256-275 ◽  
Author(s):  
Mahdi Delaviz Bayekolaei ◽  
Koorosh Naderi ◽  
Fereidoon Moghadas Nejad
Keyword(s):  
Asphalt Mixture ◽  
Polymer Nanocomposite ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Rutting Resistance ◽  
Modified Asphalt ◽  
Modified Binders ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

In recent years, the use of nano materials for improving various mechanical and performance-related properties of polymer-modified asphalt binders has been growing rapidly. However, few researches investigated the effects of base binder and styrene–butadiene–styrene (SBS) structure on rutting resistance of polymer-nanocomposite-modified asphalt mixtures. This study investigated the effect of polymer–nanocomposite modification, using two different penetration grade asphalt binders and two types of SBS, on rutting properties of asphalt mixtures. Rheological properties of modified binders, Marshall stability, resilient modulus, and rut depth in wheel-tracking tests were used to evaluate the rutting performance of the modified binders and mixtures. The results indicated that both base binder type and SBS structure had significant effect on rutting resistance of polymer-nanocomposite-modified asphalt mixtures.

Damping of Shear Vibrations in Asphalt Modified with Styrene-Butadiene-Styrene Polymer

2000 ◽  
Vol 1728 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Jiri Stastna ◽  
Ludo Zanzotto ◽  
Otaca Vacin
Keyword(s):  
Loss Tangent ◽  
Rheological Behavior ◽  
Characteristic Temperature ◽  
Asphalt Binder ◽  
Shift Factor ◽  
Asphalt Binders ◽  
Material Functions ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Shear vibrations in conventional and polymer-modified asphalt binders are examined. Using dynamic compliances instead of moduli, viscous deformation effects can be separated from total deformation and the modified dynamic loss compliance and modified loss tangent functions can be defined. These two material functions appear to be more sensitive than viscoelastic moduli to the rheological behavior of asphalt binders and to changes caused by polymer addition. The characteristic temperature of the transition from the viscoelastic to viscous behavior of asphalt binder ( Tv) can be identified by using the viscous asymptote J”. The damping of shear vibrations that likely relates to the internal structure of asphalt material can be described by the modified loss tangent. The rheological behavior of the base asphalt 200/300 penetration grade and its blends with different amounts of radial styrene-butadiene-styrene rubber is investigated. Using master curves of dynamic functions and the Williams-Landel-Ferry form of the shift factor, isochrones of the original and modified dynamic material functions are constructed. Characteristic temperatures of the viscous transition ( Tv) and the glass transition ( Tg) are determined. Damping behaviors of the base and modified asphalts are studied.

Preparation and Properties of Nanoclay/TPS/Asphalt Ternary Binders

2009 ◽  
Vol 620-622 ◽  
pp. 497-500 ◽  
Author(s):  
Shao Peng Wu ◽  
Jin Gang Wang ◽  
Yuan Zhang
Keyword(s):  
Rheological Properties ◽  
High Speed ◽  
Complex Modulus ◽  
Preliminary Investigation ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Frequency Sweep ◽  
Modified Asphalt ◽  
Aging Resistance ◽  
Before And After

After a preliminary investigation on the binary asphalt/clay binder, the ternary binder was prepared by adding the nanoclay and TAFPACK-SUPER (TPS) to the original asphalt. The previous research shows that exfoliated/intercalated layers homogeneously are dispersed in the asphalt matrix and the nanocomposite has formed. Rotation Thin Film Oven Test (RTFOT) and Pressure Age Vessel Test (PAV) results indicate that the modified asphalt with 3% organic nano-montmorillonite (OMMT) present better performance of aging resistance. The purpose of this research is to attain ternary asphalt binder with better rheological performance and aging resistance. The ternary modified asphalt binder containing 4% OMMT and 12% TPS by weight were prepared at the laboratory scale using high speed shearing mixer. The rheological properties of OMMT/TPS modified asphalt binders were evaluated before and after aging in present paper. Temperature sweep tests and frequency sweep tests were conducted to characterize the rheological properties of modified asphalt using Dynamic Shear Rheometer (DSR). According to the frequency sweep tests, complex modulus master curves were plotted to analysis the rheological properties. The results indicate that nanoclay/TPS/asphalt ternary binders have more excellent performance of rheological and aging resistance at both high and low temperatures, compared with the virginal bitumen and TPS modified asphalt.

scholarly journals Analysis of the Influence of SBS Content and Structure on the Performance of SBS/CR Composite Modified Asphalt

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yafeng Gong ◽  
Yunze Pang ◽  
Fayang Li ◽  
Weidong Jin ◽  
Haipeng Bi ◽  
...  
Keyword(s):  
Complex Modulus ◽  
Polymer Network ◽  
Crumb Rubber ◽  
Molecular Structures ◽  
High Temperature Stability ◽  
Moderate Amount ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

The performance of asphalt can be improved by adding styrene-butadiene-styrene (SBS) copolymer and crumb rubber (CR). This paper investigated the influence of the structure and content of styrene-butadiene-styrene (SBS) copolymer on the properties of SBS/CR modified asphalt (SBS/CRMA). These SBS/CRMA were prepared by mixing 90# matrix asphalt, 60 mesh CR powder, and SBS copolymers with two molecular structures, which were tested for penetration, softening point, ductility, and rheology. The complex modulus, phase angle, rutting factor, storage modulus, and dissipation modulus of SBS/CRMA were analyzed with the 64°C frequency sweep tests. The results revealed that the content and structure had significant impacts on the performances of SBS/CRMA, and the advantages of SBS polymer network structure in the modified asphalt system cannot be reflected when the amount of SBS was small. Meanwhile, the high-temperature stability, low-temperature tensile resistance, temperature sensitivity, and viscoelasticity of rubberized asphalt were further improved by adding a moderate amount of SBS copolymer. Furthermore, the properties of SBS/CRMA were better as the contents of SBS increased when the type of SBS doped was the same. The effect of modification improved by star-shaped SBS copolymer addition was more than that improved by linear SBS copolymer addition. As a conclusion, the content of 4 wt% star-shaped SBS and 20 wt% CR powder-modified 90# matrix asphalt has the best modification effect with the comparison of other groups.

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