Abstract
Polymer modified asphalt emulsion (PMAE) has recently been proven to be one of the most effective methods to overcome the common distress of asphalt surface treatments, such as abrasion, rutting, ravelling, and poor durability. Because of the limited research studies about the preparation of PMAE using SBS latex, a new method to prepare SBS latex was developed and the feasibility of using it in preparing SBS latex modified asphalt emulsion (SBS-LMAE) was verified in this study. The optimized swelling parameters for linear SBS solutions were swelling 24 h at the temperature of 50°C with the toluene/SBS (T/S) mass ratios of 2.5 : 1 to 2.0 : 1 which was determined according to the analysis of viscosity and Tyndall effect. After that, the SBS latex with favorable dispersivity and stability was successfully fabricated with the T/S ratio of 2.0 : 1. At last, the well-specified SBS-LMAE was prepared using the fabricated latex and tested for its conventional performances and microstructure. The results show that the SBS-LMAE samples all meet the main requirements of PMAE for microsurfacing and possess appropriate uniformity and stability.
Highlights
Compared with the conventional hot-mix asphalt, asphalt emulsions (AEs) are more energy efficient, environmentally friendly, and cost-effective [1]. erefore, it has been widely used in different pavement applications, such as tack coat, chip-sealing, microsurfacing, and cold asphalt mixtures
Confronted with the severe distress and deteriorates of pavement that caused by the recent significant increase in traffic volume and tire pressure, higher requirements of AE have been raised by modern engineering in aspects like sufficient strength and thermal stability at high temperature, necessary flexibility and plasticity at low temperature, adequate antiaging ability during service, and high adhesion strength to aggregates and surfaces of structures [4,5,6]. is object has been achieved upon using polymer modified asphalt emulsion (PMAE) nowadays, which possesses more advantages in terms of high- and low- temperature performances, fatigue resistance, and water stability when compared with conventional AE
PMAE is a type of AE that is modified with polymer emulsion or a product made by emulsifying polymer modified asphalt [6]
Summary
Compared with the conventional hot-mix asphalt, asphalt emulsions (AEs) are more energy efficient, environmentally friendly, and cost-effective [1]. erefore, it has been widely used in different pavement applications, such as tack coat, chip-sealing, microsurfacing, and cold asphalt mixtures. SBS has been proven to be the most effective polymer to improve the physical and mechanical properties and rheological behaviors of asphalt due to its cross-linked elastomer network structure [8, 9]. It has become the most widely used polymer for modifying asphalt. Engineering practices show that addition of SBR to AE causes significant improvements in low-temperature ductility, viscosity, elastic recovery, and cohesive properties of the pavement, but the high-temperature performance is slightly modified [6, 11]. The wellspecified SBS-LMAE was prepared by using the fabricated SBS latex as a modifier, and its performance was evaluated by the conventional test and morphology analysis
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