Abstract
The purpose of this study was to investigate the adhesive properties of polyphosphoric acid compounded SBS (PPA/SBS) modified asphalt. Three base asphalt binders, one SBS, one dibutyl phthalate (DBP), one furfural extraction oil, and two polyphosphoric acids (PPA), were used to produce the modified binders. The adhesive properties tested in this study included contact angle, cohesive work, adhesive work, and peak area ratio. Cohesive work and adhesive work indicators were calculated from the contact angle, the contact angle between PPA/SBS modified asphalt and three liquids (distilled water, glycerin, formamide) were tested by the contact angle tester, and the peak area ratio of the microscopic adhesion performance index by AFM. The relation between the microscopic adhesion performance characterization method (peak area ratio) and the macroscopic adhesion performance index (cohesive work, adhesion work) was established. The test results indicated that the PPA/SBS modified asphalt had the highest cohesive work and adhesion work under the conditions of 0.5% PPA, 1% DBP, 1.5% extracted oil, and 3.5% SBS, which was clearly greater than the original SBS modified asphalt, while the peak area ratio was consistent with the cohesive work and adhesive work, in which the correlation coefficient between the peak area ratio and cohesive work was 0.77788, and that between the peak area ratio and adhesion work was 0.87203. We recommend adopting the peak area ratio to characterize PPA/SBS modified asphalt’s microscopic adhesion properties.
Highlights
Asphalt pavement is the primary material used in high-grade pavement, most of which is distributed in regions with cold winters and hot summers
The results indicated that different types of raw materials have different effects on polyphosphoric acids (PPA)/ SBS modified asphalt’s adhesion properties, and types of asphalt and PPA with good performance should be chosen when selecting raw materials
With 0.5% PPA content, 1% dibutyl phthalate (DBP) content, 1.5% furfural extract oil content, and 3.5% SBS modifier content, the cohesion work and adhesion work were the largest, even more than the actual production of high content SBS modified asphalt, and the adhesion properties improved significantly. These results indicated that under this condition, the polyphosphoric acid compounded SBS (PPA/SBS) modified asphalt has good cohesiveness and adhesiveness with the aggregate and its water damage resistance is the greatest
Summary
Asphalt pavement is the primary material used in high-grade pavement, most of which is distributed in regions with cold winters and hot summers. Asphalt materials require the properties of high and low temperature performance, requirements that ordinary base asphalt cannot meet (Zhang et al, 2016). As part of the implementation of the strategic highway research program (SHRP) binder specification, various properties of asphalt binder can be improved significantly by adding modifiers such as polymer and rubber powder (Wang et al, 2018a; Wang et al, 2018b). Adhesion Properties and Microscopic Characterization of PPA/SBS Modified Asphalt. Penetration (25°C, 100 g, 5 s) 0.1 mm Softening point °C. Ductility (15°C, 5 cm/min) Cm. Residue after RTFOT (163°C, 85 min) Mass loss
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