Investigation of the effect of Mg-Al-LDH on pavement performance and aging resistance of styrene-butadiene-styrene modified asphalt

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.

Download Full-text

Aging Resistance of Silica Fume/Styrene-Butadiene-Styrene Composite-Modified Asphalt

Materials ◽

10.3390/ma14216536 ◽

2021 ◽

Vol 14 (21) ◽

pp. 6536

Author(s):

Jingrong Zhu ◽

Wenyuan Xu

Keyword(s):

Rheological Properties ◽

Silica Fume ◽

Asphalt Mixture ◽

Original Structure ◽

Modified Asphalt ◽

Aging Resistance ◽

Styrene Butadiene Styrene ◽

Index Value ◽

Styrene Butadiene ◽

Butadiene Styrene

The influences of silica fume content and aging on the rheological properties of silica fume/styrene-butadiene-styrene composite-modified asphalts were investigated via rolling thin-film oven test simulations. The asphalts rheological properties before and after aging were measured using three-major-indices, dynamic shear rheology, and bending beam rheometer tests. Fourier transform infrared spectroscopy was used to examine the changes in the functional groups of the asphalt. The silica fume did not chemically react with the modified asphalt, and its original structure was maintained. The aging resistance improved significantly after adding the silica fume. At 6% silica fume content, the relaxation of the asphalt was the highest, indicating that the asphalt had the best low-temperature crack resistance at this mixing proportion. Furthermore, the carbonyl index value of this sample exhibited the smallest increment among all of the samples, and this asphalt sample had the strongest short-term aging resistance. Thus, the optimum silica fume content in the composite-modified asphalt was determined to be 6%. This information may be used to fabricate an asphalt mixture that can improve the service life and aging resistance of pavements.

Download Full-text

Pavement performance evaluation of recycled styrene–butadiene–styrene-modified asphalt mixture

International Journal of Pavement Engineering ◽

10.1080/10298436.2015.1095296 ◽

2015 ◽

Vol 18 (5) ◽

pp. 404-413 ◽

Cited By ~ 6

Author(s):

Yuanyuan Wang ◽

Lu Sun ◽

Jie Zhou

Keyword(s):

Performance Evaluation ◽

Asphalt Mixture ◽

Pavement Performance ◽

Modified Asphalt ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

Download Full-text

Evaluation of Properties and Micro-Characteristics of Waste Polyurethane/Styrene-Butadiene-Styrene Composite Modified Asphalt

Polymers ◽

10.3390/polym13142249 ◽

2021 ◽

Vol 13 (14) ◽

pp. 2249

Author(s):

Bei Chen ◽

Fuqiang Dong ◽

Xin Yu ◽

Changjiang Zheng

Keyword(s):

Low Temperature ◽

Performance Test ◽

Permanent Deformation ◽

Modified Asphalt ◽

Basic Performance ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Sbs Modified Asphalt ◽

And Storage ◽

Butadiene Styrene

In order to solve the problems caused by asphalt diseases and prolong the life cycle of asphalt pavement, many studies on the properties of modified asphalt have been conducted, especially polyurethane (PU) modified asphalt. This study is to replace part of the styrene-butadiene-styrene (SBS) modifier with waste polyurethane (WP), for preparing WP/SBS composite modified asphalt, as well as exploring its properties and microstructure. On this basis, this paper studied the basic performance of WP/SBS composite modified asphalt with a conventional performance test, to analyze the high- and low-temperature rheological properties, permanent deformation resistance and storage stability of WP/SBS composite modified asphalt by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The microstructure of WP/SBS composite modified asphalt was also observed by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR), as well as the reaction between WP and asphalt. According to the results of this study, WP can replace SBS as a modifier to prepare WP/SBS composite modified asphalt with good low-temperature resistance, whose high-temperature performance will be lower than that of SBS modified asphalt. After comprehensive consideration, 4% SBS content and 15% WPU content (4 S/15 W) are determined as the suitable types of WPU/SBS composite modified asphalt.

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1036.459 ◽

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.

Download Full-text