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

Chuangchuang Chen,Zhaohui Pei,Bangwei Wu,Ji Xia,Chufan Luo,Peng Xiao

doi:10.3390/ma14195715

Abstract

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.

Highlights

With the increasing traffic load in China, many asphalt pavements may suffer from severe early damage within a few years of completion
In the past decades, in addition to SBS, many other types of modifiers have been used for asphalt mixtures to improve the durability of mixtures, such as the high modulus modifier (HMM) [3], anti-rutting agent (ARA) [3,4], and high viscosity modifier (HVM) [5]
(1)complex the storage modulus, loss modulu be calculated with complex modulus and phasethe angle, the modulus, storage can be calculated with complex modulus and phase angle, modulus, loss modulus, and rutting factor showed a similar change pattern with the(2) the com age modulus, lossthus modulus, andtakes rutting showed a similar cha aging degree of the asphalt binders deepening, this paper thefactor complex modulus aging degree of the asphalt binders deepening, this paper and phase angle, for instance, to analyze the rheology property of the asphalt binders takes t and phase angle,angle for instance, to analyze the rheology property after aging

Summary

Introduction

With the increasing traffic load in China, many asphalt pavements may suffer from severe early damage within a few years of completion. People have paid more attention to the durability of asphalt pavements [1,2]. In the past decades, in addition to SBS, many other types of modifiers have been used for asphalt mixtures to improve the durability of mixtures, such as the high modulus modifier (HMM) [3], anti-rutting agent (ARA) [3,4], and high viscosity modifier (HVM) [5]. The HMM was initially used in France to improve asphalt mixtures’ rutting resistance and fatigue resistance [3]. The dynamic modulus of high modulus asphalt concrete (HMAC). Wu [6] investigated the anti-rutting property of HMAC using the wheel track test, and the results show that

Objectives

Methods

Results

Conclusion